Answer:Loss of plant growth
Explanation:
Answer:
A change in an abiotic factor could affect the biodiversity of an eco system negatively.
Explanation:
For instance, if sunlight were dramatically decreased in a rainforest, the trees would die because they ned sunlight to produce food. this means that the monkeys, birds and other organisms wouldn't have a home and would have to leave the rainforest.
collagen is a protein found in connective tissue in animals and lysozyme is a protein that breaks down bacterial cell walls. After looking at figures in your text, what type of protein structure is only found in ONE of these proteins?
Explanation:
Protein structure is the three dimensional game plan of particles in an amino corrosive chain atom. Proteins are polymers explicitly polypeptides framed from groupings of amino acids, the monomers of the polymer.By show, a chain under 30 amino acids is regularly distinguished as a peptide, rather than of a protein. All proteins have primary, auxiliary and tertiary structures yet quaternary structures possibly emerge when a protein is comprised of at least two polypeptide chains. The collapsing of proteins is additionally determined and fortified by the arrangement of numerous bonds between various pieces of the chain.Connective tissues for the most part have barely any cells and extensive extracellular filaments including collagen and elastin. Collagen is the absolute most abundant protein in the creature body and establishes roughly 25–35% of the entire body content.Abnormal chromosomes are frequently found in malignant tumors. Errors such as translocations may place a gene in close proximity to different control regions. Which of the following might then occur to make the cancer worse? A) an increase in nondisjunction B) expression of inappropriate gene products C) a decrease in mitotic frequency D) death of the cancer cells in the tumor
Answer:
B) expression of inappropriate gene products
Explanation:
Most of the cancers are caused when a normal gene that code for one or other proteins involved in the regulation of the cell cycle is mutated. The mutated gene may cause the production of the faulty gene products. For example, the overproduction of products of the protooncogene that push cells through the cell cycle leads to tumor formation. Likewise, when the tumor suppressor genes are not able to produce enough product to prevent progression through the cell cycle, cancer may develop.
Your favorite plant is growing very slowly, and you would like to find some way to increase its growth rate. Which of the following should you try increasing first? a oxygen b nitrogen c calcium d sodium
Answer:
The correct answer is b. Nitrogen.
Explanation:
Answer: Option B.
Nitrogen.
Explanation:
Nitrogen is very important for plant growth. It is the major constituent of chlorophyll which trap light energy from sunlight to produce carbohydrates from carbon dioxide and water by a process of photosynthesis. It is components of amino acids which is the building block of protein which enhance plants growths. Nitrogen foster plants growth. Addition of nitrogen inform of nitrate to the soil which boost chlorophyll formation, build up protein for plant growth. With nitogen, the plants will either and die.
You are studying the source of new virus that has recently infected humans. You suspect that the virus was transferred from other primates (they exhibit a similar infection), specifically chimpanzees, gorillas, or orangutans. You sample blood from several infected humans and sequence some viral genes. You then build a phylogenetic tree with the human sequences and all the known strains from each primate. Draw a hypothetical phylogenetic tree that would suggest that the virus came from gorillas, and this transfer occurred twice independently. Label chimp sequences (c), gorilla (g), orangutans (o), and humans (h).
Answer:
it doesnt make sense can you try to put it some other way
Explanation:
Animals and most microorganisms are classified as chemoorganoheterotrophs. The prefixes "chemo," "organo," and "hetero" refer to how the organism meets its needs, respectively, for:
(A) electrons, carbon, and energy
(B) carbon, energy, and electrons
(C) electrons, energy, and carbon
(D) energy, electrons, and carbon
(E) carbon, electrons, and energy
Answer: Option A.
Electrons,carbon and energy.
Explanation:
Chemorganoheterotrophs are organisms that uses organic substrates to produce carbon needed for their growth and development. They derive their energy from oxidation and reduction of organic substances. The use the reduced carbon produced by autrotophs as as source of electrons, carbon and energy. Example is fungi that uses carbon as electron donor and source for carbon and energy.
Match the following pairs. The series below includes three base pairs that all code for the amino acid methionine (met), which functions to prevent fat deposits from accumulating in the liver. Based on your knowledge of complementary bases and protein synthesis, match the three base pairs with the correct term for it.
A. DNA triplet
B. mRNA codon
C. tRNA anticodon
1. AUG
2. UAC
3. TAC
Answer:
DNA triplet - TAC
mRNA codon - AUG
tRNA anticodon - UAC
Explanation:
A codon is found on the coding strand of double-stranded DNA which includes any three of the four bases (A, G, C, T) also called DNA triplet and in the (single-stranded) mRNA strand including any three of the four bases (A, G, C, U with U replacing T). The anticodon is found on the tRNA and also binds with the codon on the mRNA in order to attach the correct amino acid to the growing peptide chain in the ribosome.
thus for methionine
AUG is the codon on the mRNA (mRNA codon)
UAC is the tRNA anticodon
TAC is the DNA triplet that udergoes transcription to form AUG on the mRNA strand.
If you were a scientist studying how the building of dams by a beaver population in a forest affected river water flow, soil nutrient content, and the dynamics of other populations that rely on the river water, such as fish and amphibians, you would be a specialist at what level of biology?
Answer:
Specialist of High Average Level
Explanation:
While studying all these factors affecting the environment at the same time. One should have a High Average intellect of knowledge related to Aquatic, Marine, Soil, Microbial, Forest, Zoology, Botany, Demography as well as enough knowledge related to Bio-Physics. Only then, he'll be able to tell about the consequences related to the situation.
A scientist studying the effects of beaver dams on river ecosystems would be an ecosystem ecologist, a role that involves examining the intricate interactions between organisms and their environment, including the impact on water flow, soil nutrients, and species dynamics.
Explanation:Understanding the Level of Ecological StudyIf you were a scientist studying the impact of beaver dams on river water flow, soil nutrient content, and the dynamics of other populations such as fish and amphibians, you would be operating at the ecosystem level of biology within the field of ecology. Ecosystem ecologists examine the relationships between living organisms, including humans, and their physical environment. They focus on understanding how ecosystem components, such as the water flow and soil nutrients affected by beaver dams, interact and affect the distribution and abundance of organisms in a particular habitat.
Beaver dams can have profound effects on river ecosystems. By altering water flow and sediment distribution, these ecosystem engineers can change the dynamics of aquatic and terrestrial interfaces, influence nutrient cycles, and affect the biodiversity and health of wetlands. Changes to these ecosystems can notably impact populations of fish and amphibians, which depend on specific flow regimes and access to aquatic and terrestrial habitats for their life cycles.
Ecologists interested in conservation biology might also draw on habitat modification studies, as damming can drastically influence ecosystem dynamics. Key informed decisions for biodiversity conservation and restoration often rely on understanding such complex interactions. By investigating and modeling these impacts, ecosystem ecologists contribute valuable insights into sustainable management practices that can mitigate the effects of human intervention on natural habitats.
The proximal end of the radius illustrates the relationship of form and function. The cup-like surface of the radial head articulates with the rounded shape of the capitulum.
This forms a joint that allows for _____.
Explanation:
The two large bones of the forearm, one being the Ulna and the other is radial bone or radius.The Radius is larger in size than the Ulna.Radius is prism shaped, little curved longitudinally long bone.The part of two joints known as elbow and wrist comprised the Radius.Radius link with the capitulum of the humerus at the elbow region.Radius forms a joint at the wrist region with the ulna bone.A single Na+/K+ ATPase pump is present in the plasma membrane of an artificial cell with an initial cellular environment of 500 molecules of Na+ and 1000 molecules of ATP inside the cell, 500 molecules of K+ outside the cell, and a net charge differential across the plasma membrane of 0. Assuming the only changes in the cellular environment are a result of the pump's actions, what would be the number of Na+, K+ and ATP molecules inside the cell after 10 cycles of the pump and what would be the net charge differential (inside - outside) across the plasma membrane?
a. 300 Na+; 200 K+; 100 ATP and -100 charge differential (inside - outside)
b. 470 Na+; 20 K+; 990 ATP and -20 charge differential (inside - outside)
c. 30 Na+; 20 K+; 900 ATP and -10 charge differential (inside - outside)
d. 470 Na+; 480 K+; 10 ATP and +100 charge differential (inside - outside)
e. 30 Na+; 480 K+; 10 ATP and +20 charge differential (inside - outside)
Answer:
the correct option is A
Explanation:
the correct option is A, because a sodium-potassium pump in a cell requires ONE molecule of ATP for each cycle and exchanges 3 units of sodium for two of potassium, that is why also as the Potassium inside the cell and sodium is excreted in the extracellular medium, the interior value of the cell begins to become negative.
Sodium potassium pumps are fundamental pumps for cellular osmotic balance and are ATP dependent, this means that they need energy to operate.
The number of Na⁺ and K⁺ and the net charge differential (inside-outside) across the plasma membrane - (b) 470 Na+; 20 K+; 990 ATP and -20 charge differential (inside-outside)
Given:
Inside the cell
500 molecules - Na⁺
1000 molecules - ATP.
Outside the cell,
500 molecules - K⁺.
Solution:
we know that,
The Na⁺/K⁺ ATPase pump expels 3 molecules of Na+ and enters 2 molecules of K+ with every pump and it costs 1 ATP
Let assume there's only one Na⁺/K⁺ ATPase and there are no other changes in the cellular environment, and the Na⁺/K⁺ ATPase pumps 10 times,
Then,
So, after 10 cycles of pumping,
30 - Na⁺ move out and
20 - K⁺. get in the cell
the cost of - 10 ATP molecules.
Therefore, the net balance of the pumping action:
Inside the cell:(500-30) sodium ions, (1000-10) ATP and 20 potassium ions
= 470 sodium ions, 990 ATP, 20 potassium. Total charge = 490
Outside the cell:(500-20) potassium ions, 30 sodium ions
= 480 potassium ions, 30 sodium ions. Total charge = 510
So, charge difference (inside-outside)
= 490-510
= -20
Thus, The number of Na⁺ and K⁺ and the net charge differential (inside-outside) across the plasma membrane - (b) 470 Na+; 20 K+; 990 ATP and -20 charge differential (inside-outside)
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To aid inhalation, both the diaphragm and intercostal muscles are used. By expanding the thoracic cavity, the action of these muscles creates a space with _____ atmospheric pressure.
Answer: lower atmospheric pressure
Explanation:
During the inspiration process the diaphragm, and external intercostal muscles. The contraction of the diaphragm causes the increase in the size of the thoracic cavity this causes the contraction of the external intercostal muscles. As a result of this the ribs and the sternum get elevated.
This causes the lungs to expand, and increasing the volume of the air passage. In this response the air pressure inside the lungs reduces below the air outside the body. Thus this facilitates the movement of the gases from a region of high pressure to low pressure, this way the air rushes into the lungs.
A species' realized niche ________. cannot be larger than its fundamental niche cannot be smaller than its fundamental niche is the niche that a species realizes/experiences in the absence of competition is never really realized because it isn't real is the portion of a species' niche that is "taken over" by competing species
Answer:
C. cannot be larger than its fundamental niche
A species' realized niche, defined by the conditions under which it can survive and reproduce in the face of competition and other contrasts, cannot be larger than its fundamental niche, which represents all the environmental conditions under which the species can exist.
Explanation:A species' realized niche refers to the conditions under which a species is able to survive and reproduce in a specific environment, in the presence of competition and other environmental constraints. It is essentially the range of abiotic and biotic conditions under which a species can persist. Conversely, the fundamental niche refers to the full set of environmental conditions under which a species can survive and reproduce in the absence of competition from other species.
Therefore, a species' realized niche cannot be larger than its fundamental niche, since the realized niche is shaped by the presence of competition and other limiting factors, narrowing down the conditions under which the species can exist from the broader possibilities offered by the fundamental niche.
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In a population of rabbits, f (C1)(C1) = 0.28 and f (C2)(C2) = 0.72. The alleles exhibit an incomplete dominance relationship in which C1C1C1C1 produces black rabbits, C1C2C1C2 tan-colored rabbits, and C2C2C2C2 rabbits with white fur. If the assumptions of the Hardy-Weinberg principle apply to the rabbit population, what are the expected frequencies of: Part A black rabbits. Express your answer using two decimal places.
Answer:
0.08
Explanation:
According to Hardy-Weinberg equilibrium, in absence of an evolutionary force allele frequencies in a population remain constant. In case of polyploid organisms, the formula for Hardy-Weinberg equilibrium is :
(p+q)^c = 1 where,
p = frequency of dominant allele
q = frequency of recessive allele
c = ploidy number
Here, the ploidy number is 4 since there are four chromosomes at a locus instead of the usual two.
f(C1)(C1) = 0.28
f(C2)(C2) = 0.72
Black rabbits = C1C1C1C1
Frequency of black rabbits= f(C1)(C1)*f(C1)(C1)
= 0.28 * 0.28
= 0.0784
= 0.08
g Use the information gathered in the Nature Article Expanding the Genetic Code in the Laboratory to answer the question. How many amino acids are currently known to be encoded by the standard genetic code in at least some organisms?
Answer: 20 amino acids
Explanation:
The triplet nature of the genetic code make for a possible 64 codons: 61 code for amino acids present in most polypeptide chains while the remaining 3 are special-sense codons, since they only signal for the termination of the polypeptide chain.
Thus, due to the degeneracy of the genetic code, the 64 codons code for 20 amino acids
Explain how the ratio of elements in a compound is related to the compound’s properties.
Answer:
A compound is made up of atoms of different elements combined together in a chemical reaction with fixed ratio and in a defined manner via chemical bonding.
Elements on the other hand are pure chemical substance made of same type of atom.
The properties of the compound is related to the ratio of elements in a way that the elements individual properties will manifest itself in the compound giving it a hybrid property.
Imagine that black ash from multiple volcano eruptions made photosynthesis impossible anywhere on Earth for many years. What would be the consequences to plants and animals? How would microbes (bacteria and Archaea) be affected?
Answer:
Without Photosynthesis plants and animals won't exist.
Explanation:
Photosynthesis is a process through with plants and other living things makes food. It is a chemical reaction which is endothermic in nature that uses sunlight to turn Carbon dioxide into sugar,in order for the cells to use to perform Work.
The occurance of volcano as described in the question happens to disrupt the Continuous occurance of photosynthesis and this in turn will greatly affect the existence of plants and animals. We can simply say plants and animals can not exist without Photosynthesis.
This is because photosynthesis releases a large amount of oxygen into the atmosphere , of which both plants and animals make use of.
If I may ask how do you feel staying in an atmosphere with limited supply of oxygen ? Of course you feel suffocated and you feel you are dieing. That is exactly the scenario we are analysising now.
Some group of sea organism that doesn't depends on photosynthesis will still survive never the less. But organisms that takes in Oxygen and gives out Carbondioxide have a higher rate of not surviving.
The level of security in terms of the corresponding bit length directly influences the performance of the respective algorithm.We now analyze the influence of increasing the security level on the runtime. Assume that a commercial Web server for an online shop can use either RSA or ECC for signature generation. Furthermore, assume that signature generation for RSA-1024 and ECC-160 takes 15.7 ms and 1.3 ms, respectively
Answer:
what is the question you basicly just gave us a paragraph to comment on
Explanation:
The security level, represented by the bit length, impacts the algorithm performance. RSA and ECC illustrate this point, providing the same security level, yet ECC is faster due to its efficiency and the use of fewer bits for the same security.
Explanation:The level of security indeed has a direct impact on the performance of an algorithm, and this can be clearly seen in your given example with RSA and ECC encryption algorithms. RSA-1024 takes 15.7ms for signature generation, whereas ECC-160 only takes 1.3ms. This speed discrepancy can be attributed to the fact that ECC (Elliptic Curve Cryptography) is much more efficient than RSA. Although ECC delivers the same level of security with fewer bits, thus speeding up the process, RSA requires more computational resources for the same level of security.
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n the case of penguins, being too far from your neighbor is too cold and too close to your neighbor increases the risk of having a nest stepped on. Which types of distribution would they be most likely to use?
Answer:
Penguins in general are distributed close to each other to be able to withstand the extreme cold, characteristic of the ecosystems they inhabit. They also group together to incubate their eggs.
They perform a series of coordinated movements that help them fight low temperatures, being careful to drop the egg.
Penguins are most likely to use a clumped distribution. This allows them to balance the need for warmth from proximity to others while minimizing the risk of nest disturbances. This pattern is common amongst many species in the animal kingdom.
Explanation:The behavior described in the question for penguins refers to clumped distribution. This pattern occurs when individuals in a population find it advantageous to stay close to one another, often for reasons of protection, access to resources, or reproduction. However, as described, being too close can also have its drawbacks, such as the risk of having a nest stepped on by a neighbor. This balance between proximity for warmth and space for safety is indeed what defines a clumped distribution.
In the animal kingdom, many species use clumped distribution as a defense mechanism against predators. For penguins in particular, communal nesting not only provides safety in numbers but also helps conserve heat in the harsh, cold climate where they live.
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Who criticized Marx for focusing exclusively on economics and social class as explanations for human behavior and advocated sociological analyses that allowed for multiple influences, including ideas and beliefs of people?
Answer:
The answer is Max Weber.
Explanation:
Max Weber assumed that society and the problems of governments were dominant consequences in society, and the enhancement of balance was transformed into an establishment in sociology. In society, culture, ideas, religion, etc., they contribute to the prosperity of the social order. The subjective for Max Weber became the interpretative in human science.
The disease Leber's optic neuropathy is caused by a mutation in a gene carried on mitochondrial DNA. What would be the phenotype of their first child if a man with this disease married a woman who did not have the disease? What would be the result if the wife had the disease and the husband did not?
Answer: the child's phenotype will be normal.
The child will acquire that disease.
Explanation:
The mitochondrial DNA is a small circular chromosome that exists in the mitochondria. The mitochondria is the power house of the cell and all its 37 DNA are essential for a normal function of the mitochondria. the mtdna is passed directly from the mother (through the egg cell) to the child either a male or female but the son cannot pass his mtdna to his child. Thus, if a man with this disease marries a woman not affected, the child's phenotype will be normal. But if the wife has the disease, this willl be passed from her to her child me it a male or female.
11. Which structure is found in the inner medulla of the kidney?
A. Bowman's capsule
B. loop of Henle
C. glomerulus
D. proximal convoluted tubule
Answer: Option B) loop of Henle
Explanation:
The longitudinal section of the kidney has two distinct regions: an outer cortex and an inner medulla. The outer cortex has the following parts: glomerulus, bowman's capsule, convoluted tubule; while the inner medulla has the loop of Henle, a U-shaped loop that comes from the proximal convoluted tubule found in the medulla.
Answer: Option B.
Loop of henle.
Explanation:
The kidney longidutinal section is divide into inner and outer medulla.
The outer contain the Bowman's capsule, glomerulus e.t.c . The inner medulla of the kidney contains the loop of henle
Loop of henle is a long u shaped like part , found in the Inner medulla of the kidney. It move urine from each nephron of the kidney. It help to reabsorb water and sodium chloride from the urine. It carries filtrate from the proximal tubule to the renal medulla and move it back to the renal cortex.
Proto‑oncogenes are genes that have the potential to become oncogenes through either mutation or an increase in expression. Classify the statements as describing proto‑oncogenes or tumor suppressor genes.
Answer:
Proto-oncogenes
These genes code for protein that normally promote cell divisionMutations that increase activity of these genes may lead to cancerTumor suppressor genes
These genes code for protein that normally prevent uncontrolled cell divisionSome products of these genes normally function in repairing damaged DNAMutation that decrease activity of these genes may lead to cancer.Explanation:
Proto-oncogenes are group of genes that ordinarily help cells develop. At the point when a proto-oncogene mutates or there are such a large number of duplicates of it, it turns into a "terrible" quality that can turn out to be forever turned on or activated when it shouldn't be. At the point when this occurs, the cell becomes wild, which can prompt malignant growth. This terrible quality is called an oncogene.
Tumor suppressor genes are normal gene that hinder cell division, fix DNA missteps, or tell cell when to undergo apoptosis (die). At the point when tumor suppressor gene don't work appropriately or inactivated, cells can develop uncontrollable growth, that ultimately lead to cancer.
In the cell, enhancer sequence functions are limited in their range of action by the formation of ___________ that hold specific genes and enhancers in close proximity.
Answer:
loops
Explanation:
An enhancer is a region in the DNA containing about 50-1500 base pairs that can be bound to proteins to increase the likelihood of transcription of a certain gene.
In the cell, the enhancer functions are limited by the formation of loops that hold specific genes and enhancers in close proximity.
By doing so there will be structural distortion of the DNA which is important for limiting enhancer functions.
Enhancer sequences in the cell facilitate gene regulation by forming chromatin loops within Topologically Associating Domains, ensuring proximity between enhancers and promoters.
In the cell, enhancer sequences function to regulate gene expression by facilitating the proximity of enhancers and promoters despite their linear distance on the DNA strand. This is achieved through the formation of chromatin loops which hold specific genes and their regulatory elements, like enhancers and silencers, in close spatial proximity within a three-dimensional space. These loops are formed within specific regions known as Topologically Associating Domains (TADs), which ensure that the effects of enhancers and silencers are limited to a subset of genes within the same domain, preventing unwanted interference with other genes located in different TADs.
A rooster with white feathers is mated with a gray hen of the same phenotype. Among their offspring, 28 chicks are gray 31 are white. What is the simplest explanation for the inheritance of these colors in chickens?
Answer:
The chickens that were born from this cross show incomplete dominance.
Explanation:
The colors of chicken feathers are determined by two genes. A dominant "A" gene that determines black color and a recessive "a" gene that determines white color. In addition, chickens may present the gray color that occurs when the alleles establish an incomplete dominance, which is the type of inheritance that happens when a heterozygous individual (presents the Aa alleles) has an intermediate characteristic in relation to the characteristics determined by the two alleles .
Based on this, we can say that at the crossing shown above, there was an inheritance determined by incomplete dominance.
The inheritance of feather colors in chickens, given the mix of gray and white offspring, suggests a pattern of codominance, where the genes for white and gray feathers are neither dominant nor recessive and are expressed together in the offspring.
When a rooster with white feathers is mated with a gray hen and they produce both gray and white offspring, it appears that neither the white nor gray color is completely dominant over the other. Instead, each phenotype is expressed in the offspring, suggesting a codominant pattern where the alleles for feather color are neither dominant nor recessive and are expressed simultaneously in a unique phenotype, as is common in certain chicken breeds.Comparatively, in some other contexts, the colors may blend and display an intermediate phenotype, which is characteristic of incomplete dominance. For example, if black and white mice breed and result in all gray offspring, it would demonstrate incomplete dominance, where the black and white alleles blend to produce gray. An example in plants would be the snapdragon, where red and white parents result in pink offspring. However, in the case provided, since there are distinct gray and white offspring, codominance seems more likely.
Carbon absorbs energy at a wavelength of 150. nm. The total amount of energy emitted by a carbon sample is J. Calculate the number of carbon atoms present in the sample, assuming that each atom emits one photon.
The given question is incomplete. The complete question is as follows.
Carbon absorbs energy at a wavelength of 150 nm. The total amount of energy emitted by a carbon sample is [tex]1.93 \times 10^{5} J[/tex]. Calculate the number of carbon atoms present in the sample, assuming that each atom emits one photon.
Explanation:
It is given that the energy at which C-atom absorbs energy is 150 nm. So, energy emitted by the carbon atom will have same wavelength at which C-atom absorbs the energy.
As we know that relation between energy and wavelength is as follows.
E = [tex]\frac{hc}{\lambda}[/tex]
where, h = Planck's constant = [tex]6.624 \times 10^{-34} J sec[/tex]
c = speed of light = [tex]3 \times 10^{8} m/s[/tex]
[tex]\lambda[/tex] = 150 nm = [tex]150 \times 10^{-9}[/tex]
Therefore, energy of one carbon atom is calculated as follows.
E = [tex]\frac{hc}{\lambda}[/tex]
= [tex]\frac{6.624 \times 10^{-34} Js \times 3 \times 10^{8} m/s}{150 \times 10^{-9}}[/tex]
= [tex]1.324 \times 10^{-18} J[/tex]
As the total energy emitted by the carbon sample is [tex]1.93 \times 10^{5} J[/tex]. Let us assume that the number of C-atoms in the sample be x and it is calculated as follows.
[tex]E_{total} = n \times E_{1C-atom}[/tex]
n = [tex]\frac{E_{total}}{E_{1C-atom}}[/tex]
= [tex]\frac{1.93 \times 10^{5}}{1.324 \times 10^{-18} J}[/tex]
= [tex]1.45 \times 10^{23}[/tex]
Thus, we can conclude that number of carbon atoms present in the sample, are [tex]1.45 \times 10^{23}[/tex].
Which are true of stroke volume? Choose all correct. (20) a. It is the volume ejected per beat. b. An average resting value for stroke volume is 5 L/min. c. Cardiac output is inversely related to stroke volume. d. Mathematically, stroke volume equals EDV-ESV.
Answer:
a. It is the volume ejected per beat
d. Mathematically, stroke volume equals EDV-ESV.
Explanation:
Stroke volume refers to the volume of blood which is expelled out by the left ventricle of the heart to the body.
The stroke volume can be measured with the echocardiogram which measures the EVD or End-diastolic volume which represents the volume before the contraction of the ventricle and the ESV or End-systolic volume which represents the residual volume after the contraction.
The Stroke volume is calculated by the difference between the EDV and ESV. The stroke volume for a normal person is measured is 70 mL per sec.
Thus, the selected option is correct.
If you were trying to identify an unknown adult animal that must be either an echinoderm or chordate, which morphological feature(s) would guarantee that your organism was an echinoderm rather than a chordate.
Answer:
The radial symmetry and mesodermal skeleton in echinodems
Bilateral symmetry and internal skeleton of chordates
Explanation:
The echinoderms have radial symmetry and their skeleton is mesodermal made up of calcites known as ossicles while the chordates have bilateral symmetry and their internal skeleton is made up of bones and cartilages.
protists are a diverse group of mainly multicellular eukaryotes. true or false
Answer:false
Explanation: protists are mainly
Unicellular organism( i.e they are single cell organism) and are eukaryote( they have a nucleus) but some protist exist as multicellular example is some Algea, kelp. They can be find in moist environment.
Protist can be grouped into the
1. Animal protist are heterotrophs and they depend on autotrophs or producers for their food or other organism and are mobile( they move)
2. Plant protist are mainly autotrophs they have ability to synthesis there food through photisynthesis.
3.Fungi protist reproduce using spores. They are heterotrophs.
Some protist move by pseudopodia while some uses flagella.
Hence protein are not mainly multicellular eukaryotes but both unicellular and multicellular eukaryotes.
Answer:
false
Explanation:
protists are a diverse group of mainly unicellular eukaryotes.
Why do RNA viruses appear to have higher rates of mutation?
A) RNA nucleotides are more unstable than DNA nucleotides.
B) Replication of their genomes does not involve the proofreading steps of DNA replication.
C) RNA viruses replicate faster.
D) RNA viruses can incorporate a variety of nonstandard bases.
E) RNA viruses are more sensitive to mutagens.
Answer:
B) Replication of their genomes does not involve the proofreading steps of DNA replication.
Explanation:j
1. This is because RNA polymerase do not proofread proteins or polymerase components to check for errors and repair.
2.Because RNA viruses usually encoded their replication machinery, therefore they have the ability to replication at high rate which increases chances for mutation, to any length and extent to suits their needs.
Therefore,since there is no check for the number of replication they can go through and no need for correction of replication errors, they have rapid chances for mutation and therefore virulence. Different offspring, with distinct genetic composition from wrong bases insertion and translation and therefore of virulence totally different from the parents will be produced. Thus mutagensis, and virulence continues to increase.
RNA viruses have higher mutation rates primarily because their replication lacks DNA's proofreading mechanisms, making RNA-dependent RNA polymerases more error-prone, facilitating genetic variability and adaptation. So option B is correct choice.
RNA viruses tend to have higher mutation rates primarily because their replication process lacks the proofreading mechanisms present in DNA replication.
During DNA replication, enzymes like DNA polymerase have built-in proofreading capabilities, which help to correct errors in base pairing, resulting in a relatively low mutation rate.
In contrast, RNA viruses typically lack these proofreading mechanisms during genome replication. RNA-dependent RNA polymerases, the enzymes involved in replicating RNA genomes, are more error-prone, leading to a higher likelihood of mutations.
This elevated mutation rate contributes to the genetic variability seen in RNA viruses, allowing them to adapt more rapidly to changing environments, evade host immune responses, and potentially develop resistance to antiviral treatments.
While factors such as the instability of RNA nucleotides (option A) and the speed of replication (option C) can contribute to higher mutation rates, the absence of proofreading during replication (option B) is the primary reason for the observed higher mutation rates in RNA viruses.
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Which hormone is NOT matched with its appropriate function? a. growth hormone;lengthens bones b. leptin; regulates bone density c. calcitonin; increases blood calcium levels d. osteocalcin; regulates glucose metabolism
Answer: Option D) osteocalcin; regulates glucose metabolism is not correctly matched
Explanation:
The function of osteocalcin, secreted by cells of the bone (osteoblasts) is to regulate body metabolism by increasing the level of calcium in the bone.
Insulin and Glucagon secreted by the pancreas, on the other hand, regulate glucose metabolism by lowering and increasing the level of blood sugar respectively.
Thus, osteocalcin; regulates glucose metabolism is not a correct match
Hormone is NOT matched with its appropriate function c. calcitonin; increases blood calcium levels Therefore , c. calcitonin; increases blood calcium levels is correct .
Calcitonin is a hormone produced by the thyroid gland. Its main function is to regulate calcium levels in the blood by decreasing calcium levels. When blood calcium levels rise too high, calcitonin is released to lower the levels by promoting calcium deposition in bones and inhibiting calcium absorption in the intestines.
a. Growth hormone; lengthens bones - Growth hormone, also known as somatotropin, is produced by the pituitary gland and plays a crucial role in stimulating growth, cell regeneration, and cell reproduction.
It indeed promotes the lengthening and thickening of bones, among other growth-related functions.
b. Leptin; regulates bone density - Leptin is a hormone primarily produced by adipose cells. Its main function is to regulate energy balance and inhibit hunger.
While it primarily regulates appetite and body weight, there's some evidence suggesting it may indirectly influence bone metabolism.
d. Osteocalcin; regulates glucose metabolism - Osteocalcin is a hormone produced by osteoblasts, cells that create bone.
Recent research has indicated that osteocalcin might play a role in glucose metabolism, affecting insulin secretion and sensitivity.
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Which transport mechanism is most probably functioning in the intestinal cells using this information? Glucose diffuses slowly through artificial phospholipid bilayers. The cells lining the small intestine, however, rapidly move large quantities of glucose from the glucose-rich food into their glucose-poor cytoplasm.
A. Simple diffusion
B. Phagocytosis
C. Active transport pumps
D. Exocytosis
E. Facilitated diffusion
Answer: Option E) Facilitated diffusion
Explanation:
Facilitated diffusion engage selective transport proteins to move non-lipid soluble solutes like glucose across the lipid bilayer along concentration gradient (from high to low concentration) without the supply of energy (ATP).
Thus, transport proteins embedded in the lipid bilayer help move large quantities of glucose rapidly in intestinal cells by facilitated diffusion.