Answer: options D and E
Explanation:
The heartbeat in a human is mostly initiated by the sinoatrial node (SA node also known as the heart's natural pacemaker. Made up of a specialized bundle of cell that receives an impulse causing contraction of the atria wall allowing blood to flow into the ventricles. During systole, the ventricles are not relaxed but contracted to allow for bloodflow out of the ventricles to the aorta which is the largest artery in the human body.
2. There is a mouse inside a cage. Within the cage, there is a light bulb and a lever. You want to teach the mouse to step on the lever each time you turn on the light. When the mouse steps on the lever, you give him a treat (but only when the light turns on). After several attempts, the mouse learns that, "When the light turns on, I must step on the lever in order to receive a treat." Was this associative or instrumental learning? Explain. (2 points).
Answer:
Instrumental learning
Explanation:
Associative learning is a form of learning which is performed when two or more events or stimuli controls the learning behaviour. The instrumental learning is a type of learning in which the learning process is associated with the consequence or result of the action.
In the given question, the mouse learns how to step on the lever as a result of the received food in the form of reward or he learned because he received the treatment, therefore, this act of learning will be considered the instrumental learning.
Thus, Instrumental learning is correct.
Consider two pairs of grandparents. The first pair has 4 grandchildren and the second pair has 32 grandchildren. Which of the two pairs is more likely to have between 40% and 60% boys as grandchildren, assuming that boys and girls are equally likely as children? Why?
Answer:
The second pair of grandparents have approximately 12 to 19 boys as grandchildren.
Explanation:
The probability of a grandchild being a girl or a boy is same, i.e., [tex]\frac{1}{2}[/tex].
The first pair of grandparents have 4 grandchildren.
The second pair of grandparents have 32 grandchildren.
If first pair of grandparents have between 40% to 60% boys as grandchildren then the number of boys are in the limit,
[tex](40\%\ of 4,\ 60\%\ of 4)=(1.6, 2.4)\approx(2, 3)[/tex]
Thus, the first pair of grandparents have approximately 2 to 3 boys as grandchildren.
If second pair of grandparents have between 40% to 60% boys as grandchildren then the number of boys are in the limit,
[tex](40\%\ of 32,\ 60\%\ of 32)=(12.8, 19.2)\approx(13, 19)[/tex]
Thus, the second pair of grandparents have approximately 12 to 19 boys as grandchildren.
So, it is clear that the second pair of grandparents are more likely to have between 40% and 60% boys as grandchildren.
Also according to the law of large numbers as the sample size increases the probability of an event gets closer to the theoretical probability.
Hair pigmentation in mammals follows the generic enzymatic pathway depicted below. Enzyme A synthesizes a black pigment from a precursor, and the contribution of enzyme B results in the final agouti pigment:
Precursor molecule (colorless) Black pigment Agouti pigment
Each enzyme is coded by a single allele with complete dominance. If a crossing design begins with true breeding parents for coat color with the genotypes AAbb and aaBB. What will be the expected F2 genotypic and phenotypic ratios of the eventual F2 progeny?
Answer:
Given,
Colourless molecule is converted to black pigment by enzyme A. Black pigment is converted to agouti pigment by enzyme B.
Parent 1: AAbb = Black
Parent 2: aaBB = Colourless
AAbb X aaBB = AaBb (F1) The entire progeny is agouti coloured since dominant alleles for both the genes are present.
When AaBb X AaBb according to dihybrid cross in F2 :
A_B_ = 9 ( Agouti )
A_bb = 3 ( Black )
aaB_ = 3 ( Colourless )
aabb = 1 ( Colourless )
Hence genotypic ratio is 9 : 3 : 3 : 1
and phenotypic ratio is 9 (agouti) : 3 (black) : 4 (colourless)
Jason Ormand was arrested on suspicion of sexual assault. The arresting officers did not give Jason his Miranda warnings. Jason confesses to the assault. The DNA evidence taken from the victim shows with 99% certainty that Jason was her attacker. a. Because of the violation of Jason’s rights in the officers’ failure to give the Miranda warnings, the case must be dismissed. b. The case can still proceed with the DNA evidence. c. The case can proceed but only with the victim’s testimony. d. none of the above
Answer:
B
Explanation:
Although the arresting officer did not give Jason a miranda warning (a notification of Jason's right to remain silence and decline to answer any questions or give information to the arresting officer), Jason already confessed to the crime. Above all the DNA evidence gave a compelling revelation of 99% certainty which is a full proof evidence for the case. Therefore the case can still proceed with the DNA evidence against Jason
Answer: The case can still proceed with the DNA evidence.
Explanation: In the U.S, the Miranda warning is a warning given by a law enforcement officer to criminal suspects in his custody advising them of certain constitutional rights, called their Miranda rights. This is their right to silence; that is, their right to refuse to answer questions or provide information to law enforcement or other officials.
Jason confessed to the assault without receiving his Miranda warning. Although he is guilty and the DNA evidence proved him guilty as charged. The case can still be proceeded with that evidence .
The cytoplasm can be defined as everything that fills the space between the
and the
A.
cytosol; nucleus
B. chromosomes; ribosomes
C.
cytoskeleton; organelles
D. nucleus; DNA
E
plasma membrane; nucleus
Answer:
E, the plasma membrane and the nucleus or nuclear envelope
Explanation:
Answer: E
plasma membrane; nucleus
Explanation:
Cytoplasm is the content between the plasma membrane and the nuclear envelope.
It consist of 70-80% water, protein ,polysaccharides,potassium,nucleic acid,fart acid. It is the seat of metabolic reactions and cellular activity. It is enclosed by cell membrane.
RNA plays important roles in many cellular processes, particularly those associated with protein synthesis: transcription, RNA processing, and translation. Drag the labels to the appropriate bins to identify the step in protein synthesis where each type of RNA first plays a role. If an RNA does not play a role in protein synthesis, drag it to the "not used in protein synthesis" bin.
Complete question: "RNA plays important roles in many cellular processes, particularly those associated with protein synthesis: transcription, RNA processing, and translation. Drag the labels to the appropriate bins to identify the step in protein synthesis where each type of RNA first plays a role. If an RNA does not play a role in protein synthesis, drag it to the "not used in protein synthesis" bin.
1. transcription/RNA processing
2. translation
3. not used in protein synthesis
a) snRNA
b) tRNA
c) mRNA
d) RNA primers
e) pre-mRNA
f) rRNA
Answer
1. transcription/RNA processing:
a) snRNA
c) mRNA
e) pre-mRNA
2. translation
b) tRNA
f) rRNA
3. not used in protein synthesis
d) RNA primers
Explanation:
There are many RNAs, each in charge of performing a different function.
preRNA is the precursor of the mature mRNA. These molecules possess long intermediate sequences called introns that do not codify for proteins. It occurs a posttranscriptional modification that eliminates introns and makes the RNA to get mature as mRNA. snRNA means "small nuclear RNA". These are small RNA molecules located in the nucleus and are implicated in the mRNA maturation process. They associate with proteins composing the small nuclear ribonucleoproteins, and their function is to contribute to the initial mARN processing that transcribes from DNA and that must maturate to be exported from the nucleus. These molecules eliminate the introns. mRNA means "messenger RNA". These molecules are carriers of the genetic information and are in charge of transporting it from the genome to the ribosomes. They are the mold for the new protein synthesis. Their nucleotide sequence is complementary with the nucleotide sequence of a particular DNA segment. rRNA means "ribosomal RNA". They are the principal ribosomal component. Ribosomes are constituted by two subunits. One of them is a big RNA molecule associated with about 20 proteins. The other subunit is composed of three RNA molecules associated with about 50 proteins. tRNA means "transference RNA". These molecules are in charge of transferring activated amino acids from the cytosol to the ribosomes where the new protein is being synthesized.Protein synthesis is initiated when mRNA meets a free ribosome, the primary structure for protein synthesis. Ribosomes can be found in the rough endoplasmic reticulum or floating in the cytosol. They read the mRNA code and add the correct amino acid using transference RNA to build the protein.
In protein synthesis, mRNA first plays a role in transcription by carrying genetic instructions for protein assembly. rRNA is then involved as a structural component of ribosomes in translation, while tRNA brings amino acids for polypeptide chain elongation. miRNA, though not directly involved in protein chain assembly, regulates gene expression impacting protein synthesis.
Explanation:Roles of RNA in Protein SynthesisDuring protein synthesis, several types of RNA work collaboratively to convert the genetic information within DNA into functional proteins. messenger RNA (mRNA) is synthesized in the nucleus during transcription. It carries the genetic code from DNA and is involved in protein synthesis by translating the genetic instructions. MRNA is the first type of RNA to play a role in this process as it is required for transcription.
Ribosomal RNA (rRNA) is a structural component of ribosomes, which are the sites of protein synthesis in the cell. It comes into play during the assembly of ribosomes and directly assists in the process of translation as part of the ribosome's structure.
Transfer RNA (tRNA) carries amino acids to the ribosome and matches them to the coded mRNA message during translation. TRNA is crucial in the later stages of protein synthesis where it contributes to the elongation of the polypeptide chain.
MicroRNA (miRNA), however, does not have a direct role in the assembly of protein chains. Instead, it is involved in the regulation of gene expression by interacting with mRNA and can thereby influence protein synthesis indirectly.
Sally's estimated energy requirement, based upon her age, height, and weight, is approximately 2000 kcalories per day. What is the maximum number of kealories per day that she can consume to lose 3 pounds per month? Assume 1 month is 3o days. a. 1650 kcalories b. 1400 kcalories c. 1700 kcalories d. 1530 kcalories e. 1200 kcalories
Answer:
A. 1650 kcalories per day.
Explanation:
Given:
Energy requirement = 2000 kcalories per day
Number of pounds loss per day = 3 pounds per month
Since 3,500 kcal = 1 lb,
= 10, 500 kcalories per month
Since 30 days = 1 month,
Energy requirement per month = 2000 × 30
= 60,000 kcalories per month
Number of kcalories consumed per month = 60000 - 10500
= 49,500 kcalories ÷ 30 days
= 1650 kcalories per day.
Match each cardiac valve with the two chambers it separates. Each pair of chambers may be used more than once, or not at all. tricuspid mitral bicuspid pulmonary semilunar aortic semilunar A. right atrium and right ventricle B. left atrium and left ventricle C. right ventricle and pulmonary artery D. left ventricle and aorta E. right ventricle and aorta F. left ventricle and pulmonary artery
Answer:
Explanation:
The tricuspid valve separates the right atrium from the right ventricle carrying deoxygenated blood from right atrium to right ventricle
The mitral/bicuspid valve separates the left atrium from the left ventricle carrying oxygenated blood from left atrium to left ventricle
Pulmonary semilunar valves separates the right ventricle from the pulmonary artery preventing bachelor of blood.
Aortic semilunar valves separates the left ventricle from the aorta preventing backflow of blood
The tricuspid valve separates right atrium and ventricle, the mitral/bicuspid valve separates left atrium and ventricle, the pulmonary semilunar valve separates right ventricle and pulmonary artery, and the aortic semilunar valve separates left ventricle and aorta.
Explanation:The tricuspid valve separates the right atrium and the right ventricle (Option A). The mitral valve or the bicuspid valve separates the left atrium and the left ventricle (Option B). The pulmonary semilunar valve separates the right ventricle and the pulmonary artery (Option C). Lastly, the aortic semilunar valve separates the left ventricle and the aorta (Option D). These valves control the flow of blood between different chambers to ensure it moves in the correct direction.
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The Hopi, Zuni, and other Southwest indigenous peopleshave a relatively high frequency of albinism resulting from homozygosity for a recessive allele, a. A normally pigmented man and woman, each of whohas an albino parent, have two children.a.What is the probability that both children are albino?b) What is the probability that at least one of the children is albino?
Answer:
a. Zero percent
b. Fifty percent
Explanation:
As it has been mentioned in the question that both man and woman are normally pigmented and each one have an albino parent thus both will be heterozygous and their allelic makeup will be as follows -
Man - Aa
Woman - Aa
After a cross between Aa × Aa we get the following result-
One AA, Two Aa and One aa
It is clear that only the aa type of offsprings will be albino.
Out of 4 there is probability of only one to be albino so out of two there will be 50% probability of being albino.
The probability of both sons to be albino will be zero percent.
A cladogram...a. Represents a hypothesis for the most likely evolutionary relationships among the set of organisms being considered.b. Uses parsimony to align the relationships among the different subgroups being considered.c. Is produced by only one evolutionary process, which is called cladogenesis.d. Represents the true evolutionary history of the set of organisms being considered.e. Was the first form of wireless communication between the East Coast and the West Coast of the United States.
Answer:
The answer is B.
Explanation:
A cladogram is a method that is used in biological research and it can be described as a simple diagram that demonstrates the relationships, similarities/differences between different species of animals.
Among the given options in the question, the correct one is B.
The cladogram uses parsimony to align the relationships among different subgroups of beings. Parsimony is a term that means choosing the simplest explanation for a given question.
I hope this answer helps.
True or False: Throughout your entire body, the function of acetylcholine is always to inhibit the activity of organs (slow things down), and the function of norepinephrine is to stimulate the activity of organs (speed things up).
Answer: False
Explanation:
Acetylcholine functions in the central nervous system and peripheral nervous system both as activator and inhibitor.
It can cause the skeletal muscle to contract and it also inhibits the activation of the cholinergic system.
Whereas, the norepinehrine functions to mobilize the brain and body for actions. It is released lowest at the the time of sleeping , it shoots up at the time we are awaken and is highest at the time of stress.
Jack Friedman, a 41-year-old male, was in a fight at a soccer game and was hit in the head with a bottle, which caused some deep lacerations in his scalp. Dr. Girald performed a layered closure of the wounds: one 2.0 cm, one 4.5 cm, and two lacerations that were 1.0 cm each in length.
Answer:
Good for him :)
Index Wound Repair Scalp Intermediate 7.6 cm to 12.5 cm2.0 + 4.5 + 1.0 + 1.0 = 8.5 cm Rudy Porter, a 71-year-old man, had in a history of gastrointestinal problems, including colon polyps.
After taking home a special kit, he submits stool samples for an occult blood test by immunoassay.
What does laceration mean?
A laceration or laceration refers to a skin wound. Unlike an abrasion, none of the skin is missing. A cut is usually thought of as a wound caused by a sharp object, such as a piece of broken glass.Lacerations are usually caused by blunt trauma.Learn more about laceration here.
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Complete hydrolysis of a glycerophospholipid yields glycerol, two fatty acids (16:1(∆9) and 16:0), phosphoric acid, and serine in the molar ratio 1:1:1:1:1. Name this lipid and draw its structure.
Answer:
Phosphatidyl Serine
Explanation:
Phosphatidylserine is a phospholipid and is a major constituent of the cell membrane. It aids in cell cycle signaling, majorly in the aspect of apoptosis. It is a basic pathway for viruses to invade cells through apoptotic mimicry
Phosphatidylserine is implicated in Alzheimer's disease, age-related decrease in mental function, boost thinking ability in young people, attention deficit-hyperactivity disorder (ADHD), depression, reducing exercise-induced stress, and boosting an athletic performance.
Phosphatidyl serine (PS) is a phospholipid nutrient which is seen in fish, green leafy vegetables, soybeans and rice, and is important for the proper working of neuronal cell membranes and activates Protein kinase C (PKC) which play a major role in memory function.
Apoptosis can occur in a cell when the cell is ________________. Group of answer choices no longer needed damaged infected by a virus all of the above (damaged, no longer needed, infected by a virus)
Answer:
all of the above
Explanation:
The programmed cell death which is a part of normal growth and development of the cell is called apoptosis. Apoptosis occurs in multicellular organisms.
By apoptosis, the body eliminated the old cell, unnecessary cells, damages cells, and the cells which are infected by viruses. Caspases are the enzymes that are activated during the time of apoptosis and mediates cell death.
It kills the cell by cleaving some protein present in the cytoplasm and nucleus of the cell. By apoptosis, the body maintains the healthy cell numbers. So the right answer is all of the above.
Various types of damage can lead to acute inflammation, including cuts and abrasions, heat, and microbial damge. Some microbes have structures which can trigger the acute inflammatory repsonse when they invade tissues.
What structural characteristics common to Gram-negative bacteria may trigger the acture inflammatoty respone?
A. Teichoic acid
B. Mycolic acid
C. Lipid A
D. External polysaccharides
Answer:
C: Lipid A
Explanation:
Lipid A is a component of the endotoxin (also called the lipopolysaccharide) present in Gram-negative bacteria. The LPS has 3 component namely;
the O-antigen: they are antigenic determinants and are the outer carbohydrate chainsthe core polysaccharide: forms the centre core of the LPSThe Lipid A: forms the innermost part of the LPS and triggers acute inflammatory responses (e.g endotoxic shock) when released.Upon detection of an endotoxin which forms the component of the outer membrane of a Gram negative organism (in exception to the Gram-positive bacteria called Listeria monocytogenes), the innate immune defense system (e.g macrophages and T-helper cells) are alerted to initiate elimination strategies towards the invading organism. Lipid A binds to the CD14/MD2 receptor on macrophages and monocytes which activates the nuclear factor kappa- light chain enhancer (NF-κβ). The activation of NF-κβ protein triggers the production of inflammatory cytokines which includes Interleukin-1 (IL-1), IL-12, IL-18 as well as the Tumor necrosis factor- alpha (TNF-α).
Inflammatory responses are as a result of the release of these cytokines which sometimes leads to shock and death of the host
What is the predicted effect of bird presence on the survivorship or biomass of the plants? (Hint: if this question leaves you puzzled, it may help to think about feeding time. If there were no birds, would more or less plant tissue be eaten by grasshoppers?)
1. more birds results in decreased biomass
2. more birds results in increased biomass
3. fewer birds results in increased plant biomass
2. more birds results in increased biomass
Explanation:
Since birds mostly feed on insects. The increase in number of birds will cause a decrease in insect population.
Now if we consider plant eating insects, the increase in plant eating insect population will result in decrease in biomass of plants because they eat up the plant tissues.
Now relating the above situation we can conclude that if the population of bird increase, they will feed on more and more insects and thus the population of insect will decrease. and in turn, the survivorship or biomass of plants will also increase.
The predicted effect of bird presence on the survivorship or biomass of the plants is B. more birds results in increased biomass.
It should be noted that in a predator-prey relationship, the presence of a predator is vital in controlling the population of the prey.
Based on the complete information, the birds are predators while the grasshoppers are the prey. Therefore, the predators keep control of the population of the prey. Therefore, more birds result in increased biomass. They indirectly control the foraging of grass by the grasshoppers.
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In ______ , the spindle disappears as the nuclear envelopes form. The plasma membrane furrows to give two complete cells, each of which has the haploid, or N, number of chromosomes. Each chromosome has one chromatid.
Answer: telophase;
Explanation:
In the telophase stage meiosis 2 during cell division, the spindle disappears and the nuclear envelope begins to reform and the cell begins to split into two.
During cytokinesis, the final phase of cell division, the spindle disappears and nuclear envelopes form around each set of decondensed chromosomes. The plasma membrane then furrows to create two separate haploid cells, each with a single set of chromosomes.
Explanation:The subject of your question is referring to the final phase of cell division, which is known as cytokinesis. During cytokinesis, the spindle disappears and nuclear envelopes begin to form around each set of sister chromatids, which have decondensed into chromosomes. The plasma membrane furrows or forms a cleavage furrow to eventually split the cell into two separate cells. Each new cell is haploid, meaning that it has one complete set of chromosomes (N). Therefore, each chromosome indeed consists of a single chromatids.
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g In rabbits, an allele that produces black fur (B) is dominant over its allele for brown fur (b). The allele of another gene (E) produces long ears which is dominant to floppy ears (e). Suppose a female with brown fur and homozygous for long ears is mated with a floppy-eared male homozygous for black fur.
Expected genotype ratio = 100% BbEe
Expected phenotype ratio = 100% black fur and long ears
Genotype of a female with brown fur and homozygous for long ears = bbEE
Genotype of a floppy-eared male homozygous for black fur = BBee
Crossing the 2 in a 4 x 4 Punnet's square:
Genotype = 100 BbEePhenotype = 100% black fur with long earsThe result of Punnet's square is attached.
The complete question:
In rabbits, an allele that produces black fur (B) is dominant over its allele for brown fur (b). The allele of another gene (E) produces long ears, which is dominant to floppy ears (e). Suppose a female with brown fur and homozygous for long ears is mated with a floppy-eared male homozygous for black fur. What are the expected genotypes and phenotypes of their offspring?
Explain how the potential for specialization varies with cell type and how it varies over the life span of an organism.
Answer:
Explanation:
Cell specialization is the process of cell differentiation. In this process the generic or normal cells in the body change their specific forms and functions to perform certain specific tasks in the body. This varies with the cell type for example, in young development embryos the stem cells proliferate and differentiate to support the development of body parts and organs in the body whereas in the case of stem cells in adults are specialized to replace the worn out cells of the brain, bones, blood and heart. Thus the specificity of the stem cells varies during various stages of life span of an organism that is from birth till the death.
Cell specialization varies according to the type of cell and over the life span of the organism. This variation allows for increased efficiency of the cells to perform their respective roles in the organism. The process, known as cellular differentiation, involves varying gene expressions, with stem cells representing the unspecialized stage.
Explanation:The potential for specialization varies with cell type and over the life span of an organism based on the function they are required to perform. Organisms start their life from a single fertilized egg cell, which then divides to give rise to trillions of cells. Through a process known as cellular differentiation, these initially similar cells become specialized in both structure and function.
Cells in multicellular organisms like humans become specialized to allow for increased efficiency. Different sets of genes are expressed in different cells leading to their unique functions. For instance, a muscle cell is different from a liver cell, meeting their respective functional requirements for the organism. This variation in specialization continues over the lifespan of the organism, including the changes in gene expression to adapt to environmental changes.
Before a cell becomes specialized, it is known as a stem cell. These cells can divide into more stem cells or differentiate into various specialized cell types. While an already specialized cell generally remains as such, research is ongoing to coax these cells in the lab to become a different specialization.
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9. Which of the following statements are accurate?
A. The liquid portion of the blood is known as the hematocrit
B. Platelets function in blood clotting
C. Lymphocytes are the only type of white blood cells and are immune cells.
D. Red blood cells are known as erythrocytes
E. Hemoglobin would be found in white blood cells and function in carrying oxygen to the body tissues
Answer: Option B and D are accurate statements
Option B) Platelets function in blood clotting
Option D) Red blood cells are known as erythrocytes
Explanation:
Option A is not accurate because the liquid portion of the blood is known as the plasma.
Option B is accurate because blood platelets, also known as thrombocytes aid in the clotting of blood.
Option C is not accurate because types of white blood cells include lymphocytes, neutrophils, basophils, eosinophils, and monocytes
Option D is accurate because Red blood cells are also known as erythrocytes and helps in the transport of oxygen in the body.
Option E is not accurate because hemoglobin is found ONLY in red blood cells where they function in carrying oxygen to the body tissues.
Thus, only Option B and D are accurate statements
Han takes a shower in his family’s new apartment. He gets the water perfect—not too hot, because that hurts! Then Han hears his son flush the toilet. The water gets very hot, which makes Han feel a lot of pain. After this happens a few times, Han feels afraid when he hears a toilet flush while he is in the shower. When Han is subject to classical conditioning, the unconditioned stimulus (US) is _____; the unconditioned stimulus (CS) is _______; the unconditioned response (UR) is _____; and the conditioned response (CR) is _____.
Answer:
Unconditioned stimuli, US: getting hurt by hot water.Conditioned stimulus, CS: hearing a toilet flush.Unconditioned response, UR: feeling pain after hurting.Conditioned response, CR: being afraid when hearing a toilet flush.Explanation:
Unconditioned stimuli: Biologically significant stimuli that provoke an unlearned or reflex reaction. For example, getting hurt by hot water.Conditioned stimuli: neutral, innocuous or biologically not significant stimuli. For example, hearing a toilet flush.Unconditioned Responses: Unlearned response that is triggered by reflex because of an unconditioned stimulus. For example, feeling a lot of pain after hurting by hot water. Conditioned Responses: These are provoked by conditioned stimuli. This refers to a learned response that reflects the association between conditioned and unconditioned stimuli. For example, being afraid when hearing a toilet flush.Initially, an unconditioned stimulus does not provoke any response, but after enough exposition to conditioned and unconditioned stimuli together, the simple presence of unconditioned stimuli induces conditioned responses. In this aspect, the subject has learned to predict or to anticipate the unconditioned stimulus.
Processes of Mechanical Weathering The processes of mechanical weathering transform rocks exposed at the surfaceover time. In frost wedging, seasonal freezing of water causes expansion of cracks in rock. Salt crystal growth within fissures or cracks in rock similarly causes expansion and mechanical weathering. Sheeting occurs when large sheets of rock dome upward and peel off when overlying rocks are eroded away,decreasing pressure. Biological activity can also cause mechanical weathering ofrocks when living things such as the roots of plants or bacteria cause rocks to break apart. Fill in the sentences below to explore the four different mechanical weathering processes. Climatehas a crucial influence on the rates of all types of mechanical weathering.Salt crystal growthcan contribute to crumbing roadways in areas where saltis spread to melt ice and snow in winter. The fissures formed as a result of Sheetingin exfoliation domes can be further enlarged by Frost wedgingin areas subjected to seasonal freeze-thaw cycles. The break down of rock by moving fresh materials to the surface by burrowing animals is an example of mechanical weathering due to Biologicalactivity.
3.Considering the following list, which is not an example of chemical weathering?
a.Exfoliation
4.What is the definition of physical weathering?
a.Mechanical processes break substances into smaller pieces.
Physical weathering, or mechanical weathering, is the process by which rocks are broken down into smaller pieces through mechanical forces. Chemical weathering is not an example of physical weathering.
Explanation:Physical weathering, also known as mechanical weathering, is the process by which rocks are broken down into smaller pieces through mechanical forces. This is typically caused by factors such as temperature changes, freeze-thaw cycles, or the growth of plants and animals. It does not involve any chemical reactions. Examples of physical weathering include frost wedging, salt crystal growth, sheeting, and biological activity.
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3. Which of the following statements are accurate?
A. Veins in the pulmonary circuit carry oxygen-rich blood
B. Arteries in the pulmonary circuit deliver oxygen-rich blood to the body tissues.
C. All arteries carry blood away from the heart
D. Arteries in the pulmonary circuit deliver oxygen-poor blood to the lungs.
E. Veins in the systemic circuit return oxygen-poor blood to the heart.
A.) Veins in the pulmonary circuit carry oxygen-rich blood
red blood cells are used to circulate oxygen through out the body, thus it is true.
You must read the New York Times article "Diabetes Study Ends Early With a Surprising Result" found in the pre-lab notes before answering the pre-lab quiz questions this week The hypothesis for the study presented in this article is a. Diet and exercise impacts likelihood of becoming diabetic. b. Diabetes impacts likelihood of developing heart disease. c. Diet and exercise impact blood sugar levels, blood pressure, and cholesterol levels in diabetics. d. Diet and exercise impact rates of heart attacks, strokes, and cardiovascular deaths in diabetics.
Explanation:
Diabetes is a disease which happens when our blood glucose or blood sugar amount in the body is too high.The main source of energy to carry out other activities of body is Blood Glucose. This Blood Glucose comes from the food we eat.The hormone named Insulin, which is made by the pancreas, helps the glucose which is taken from the food to get into the cells and is used for energy.The regular exercise and control diet reduces the rate of heart attacks, cardiovascular deaths in diabetics and strokes.
All of the following are autotrophs EXCEPT (Multiple answers possible) a mushroom. the algae living inside a lichen. a giant redwood. a kangaroo. a cyanobacterium.
Autotrophs make their own food from light or chemical energy. In the given list, a mushroom and a kangaroo are not autotrophs, they are heterotrophs, needing to consume other organisms for energy. On the other hand, the algae inside a lichen, a giant redwood, and a cyanobacterium are autotrophs.
Explanation:In the provided choices, a mushroom and a kangaroo are not autotrophs. The term Autotroph refers to organisms that can produce their own food using inorganic materials and energy from the sun or from inorganic chemical reactions, a process known as photosynthesis or chemosynthesis. Examples are the algae living inside a lichen or a cyanobacterium. Redwood trees are autotrophs as well, as they photosynthesize. In contrast, mushrooms, which are fungi, and kangaroos, which are animals, are heterotrophs. Heterotrophs cannot produce their own food and must consume other organisms for energy.
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The order of genes on a plant chromosome is A, B, and D, where A and B have a recombination frequency of 0.2, and B and D have a recombination frequency of 0.3. A pure-breeding plant that has the dominant A and B phenotypes with a recessive d phenotype is crossed to a pure-breeding plant that has the recessive a and b phenotypes with the dominant D phenotype. The resulting hybrid is crossed to a plant that has all three recessive phenotypes. Under the assumption that interference in this region is zero, what percentage of each progeny type would result from a single crossover between A and B
Answer:
It is given that RF (recombination frequency) between A and B= 0.2
RF between B and D= 0.3
Now, DCO (Double Crossover frequency) can be calculated as 0.2 X 0.3 = 0.06
Interference assumed= 0
We can now calculate for SCO as RF (B and D)- DCO frequency
= 0.3- 0.06 = 0.24
Since, the result of each recombinant event is two recombinant types, hence,
24/2 = 12% Abd/abd and 12%aBD/abd
Explanation:
Answer: 12% Abd/abd 12%aBD/abd
Explanation: When recombination frequency(RF) between A and B is given as 0.2
Recombination frequency between B and D = 0.3
Where double crossover frequency (DCO) is calculated as 0.2 × 0.3 = 0.06
The interference assumed as = 0
Single crossover (SCO) can be calculated as recombination frequency of (B and D) - Double crossover frequency which is 0.3 - 0.06 = 0.24
Each recombinant event has an overall result of two(2) types
Therefore; 24÷2= 12%
= 12% Abd/abd and 12%aBD/abd
Many exergonic reactions fail to happen at a reasonable rate (e.g. conversion of diamonds to charcoal). This is due to the fact that their activation energy may be too high to overcome. Which of the following correctly describes the reason for this
O The free energy of the transition state is much lower than the free energy of the reactants
O The free energy of the transition state is much higher than the free energy of the reactants.
Many exergonic reactions fail to happen at a reasonable rate (e.g. conversion of diamonds to charcoal). This is due to the The enzyme that catalyzes the reaction needs time to interact chemically with the substrate(s).
The interaction between the enzyme and substrate(s) involve a decrease in entropy, which can't happen input of energy
Answer:
The correct answer is "The free energy of the transition state is much higher than the free energy of the reactants".
Explanation:
Activation vitality is the base measure of vitality required to begin a concoction response. The wellspring of this initiation vitality is generally the warmth from the encompassing. An Enzyme builds the pace of a compound response by bringing down its actuation vitality.
During a compound response, new bonds are made and old ones are broken. Since the bonds are vitality putting away , this prompts arrival of vitality when broken, However, To get the particles into a state where their bonds can be broken, the atom ought to be mad. To accomplish this shape, Activation vitality is required, which is a high-vitality flimsy state.
Because of the above explanation, cells at time couple exergonic reaction(\DeltaG<0) with endergonic reaction(\DeltaG>0), permitting them to continue. This is known as vitality coupling and is unconstrained. At the point when the exergonic response discharges free vitality, consumed by the endergonic response.
Which of the following does not describe the structure of DNA?
double helix
o nucleotide polymer
contains adenine guanine pairs
sugar-phosphate backbone
Answer:
contains adenine-guanine pairs
Explanation:
The statement, that is, adenine pairs with guanine does not describe the structure of DNA.
The structure of DNA:The heredity substance in humans and almost all the other species is DNA or deoxyribonucleic acid. It is situated within the nucleus of the cell. It is a nucleotide polymer, which is aligned in the form of two long strands that produces a spiral shaped composition called double helix.
The structure of the double helix is like a ladder, with the base pair producing the rungs of the ladder and the sugar and phosphate molecules producing the vertical sidepieces of the ladder. In the DNA, the bases pair up with each other, with adenine pairing with thymine and cytosine with guanine.
Thus, the option, that is, it contains adenine guanine pairs is incorrect.
Find out more information about DNA structure here:
https://brainly.com/question/13522078
What does a virus do once its inside one of your cells?
3 points
it stays inside for a while, then leaves
it eats up the machinery in the cell
it uses the cells machinery to make copies of itself
it prevents the mitochondria from making ATP
Answer: It uses the cell machinery to make several copies.
Explanation:
Viruses are infectious agents that live, replicates or multiply in an host cell. When virus invade an host cell, it will make the host cell to use it resources or machinery to make copies or replicates copies of it's DNA or itself,thereby causing infections and damages to the host cell.
Answer:
it uses the cells machinery to make copies of itself
Explanation:
Viruses are microscopic organism that lives in our environment always looking for his cell.
They attach themselves to the host cell and make use of the enzymes and protein in the host cell to multiply itself. Virus have a protein covering they helps it attach itself to the his cell. Some virus do not enter the host cell but but releases there content into the cell of the host organism.
Hence, Viruses uses chemical machinery of the host cell to make copies of itself.
What type of enzyme regulation happens when a molecule similar in shape to the original substrate binds to the active site preventing the enzyme from reacting with the substrate?
Answer: Competitive inhibition
Explanation:
Competitive inhibition is a form of enzyme control in which an inhibitor molecule, very similar in structure to the normal substrate of an enzyme, becomes reversibly bound to the active site.
A good example is malonate (an inhibitor) depriving succinate from binding to the active site of the enzyme, succinic acid dehydrogenase
Answer: Competition inhibition.
Explanation:
Competition inhibition happen when inhibitor compete with the substrate. This occur when an inhibitor which look like substrate bind to the enzyme at the active site thereby withholding the substrate from binding. Inhibitor are analogos because their structure look like the substrate. Example include antineoplastic drug methotrexate.