Answer:
When a scientific theory is shown to be an accurate description of a phenomenon, It's tested by other scientists to replicate the experiment and confirm the findings.
Explanation:
A scientific theory is a tested hypothesis about any natural phenomenon. Scientists conduct several experiments and when several scientific methods approve a hypothesis repeatedly, it is termed as a scientific theory. However if updated scientific methods provide opposite findings, a scientific theory can be rejected or modified.
Answer:
a
Explanation:
Which of these is unique to flowering plants?haploid gametophytes,an embryo surrounded by nutritive tissue,double fertilization,a dominant sporophyte generation,pollen production
Answer:
double fertilization
Explanation:
Flowering plants or angiosperms are seed-producing plants with the ability to produce reproductive organs-flowers and fruits with seed in it (unlike gimnosperms which contain naked seed). Another distinctive feature of angiosperms is their reduced gametophytes. This feature most likely reduces the time between pollination and fertilization. Fertilization in flowerin plants is double, meaning that two sperm cells fertilize ovule cells(egg cell and central nuclei cell): one forms diploid zygote which will develop in embryo, while other form triploid cell which will develop into endosperm (provides nutrition for the embryo).
Answer:
Double fertilization
Explanation:
In flowering plants, one sperm nucleus fertilizes the egg and other sperm nucleus fuses with two other nuclei found within the ovule—thus forming triploid endosperm.
What is the gel-like fluid that fills the cell and surrounds the organelles?
Chloroplast
Cytoplasm
Mitochondria
Ribosome
Answer:
Cytoplasm!!
Explanation:
The gel-like substance that fills a cell and surrounds the organelles is known as the cytoplasm. It primarily contains water, along with various molecules and ions required for cellular activities, housing the organelles within it.
Explanation:The gel-like fluid that fills the cell and surrounds the organelles is called the cytoplasm. The cytoplasm is majorly made up of water and also contains various molecules and ions needed for the cell functions. Organelles such as the mitochondria, ribosomes, and others, are suspended in the cytoplasm and perform their functions there. It's important to note that cytoplasm is not one of the organelles, but the medium in which they reside and operate. Therefore, the cytoplasm is popularly described as the 'backdrop' or 'stage' upon which the 'actors' (organelles) carry out their roles.
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On Earth, animals were sorted out by classification. There were many kingdoms that defined whom they were. Which of the following is the most generic classification for animals?
Population
Group
Genus
Species
Answer: Genus
Explanation:
We can automatically cross out "Population" and "Group" because both are not part of the classification system. Species is more specific, so our only answer would be Genus.
Hope this helps ya :D
Which pregnancy-specific structure is responsible for delivering nutrients and oxygen to the fetus and removing waste products? which pregnancy-specific structure is responsible for delivering nutrients and oxygen to the fetus and removing waste products? blastocyst placenta uterus amniotic fluid?
Answer:
Blastocyst placenta.
Explanation;
During pregnancy the fetus depends on its mother for nourishment and oxygen since it cannot breathe air it's blood circulates differently than it does after birth.Due to the circumstances stated above the mothers womb develops an organ known as the placenta that develops and implants in the mother's womb during pregnancy to provide oxygen and nutrients to the growing baby and remove waste products from the baby's bloodThe fetus is connected to the placenta by the umbilical cord which contains blood vessels that transport nutrients and oxygen from the mothers blood to the baby and also transports waste products and carbon dioxide from the baby to the placenta and then to the mothers circulatory system to be eliminated.The placenta is the pregnancy-specific structure that delivers oxygen and nutrients to the fetus and removes waste products.
The structure responsible for delivering nutrients and oxygen to the fetus and removing waste products is the placenta. The placenta is a unique, temporary organ that connects the developing baby to the mother, enabling the transfer of oxygen and nutrients into the fetus's bloodstream while also allowing for the elimination of waste products. This exchange occurs through the umbilical vein and arteries: oxygen-rich blood is carried to the fetus via the umbilical vein, and oxygen-depleted blood, along with wastes, returns to the placenta through the umbilical arteries.
A zebra mussel is discovered in a lake in Pennsylvania for the first time. Why would this make an ecologist worried?
A. Zebra mussels need to live in hot-water environments.
B. Zebra mussels are vulnerable to many predators in that lake.
C. Zebra mussels need to live in salt-water environments and it will hurt the organism.
D. Zebra mussels are an invasive species that can completely disrupt an ecosystem
Answer:
D
Explanation:
Zebra mussels can be a nuisance in novel ecosystems. When introduced in a non-native ecosystem with no natural predators, they reproduce rapidly displacing native mussels. Zebra mussels take up much of the algar that feeds the other native species hence starving them to death and causing their numbers to plummet. In addition, they attach to the other mussels and clog up power plants, that use the local water, water intakes.
Answer:
D. Zebra mussels are an invasive species that can completely disrupt an ecosystem
Explanation:
Which does not increase blood pressure? increased venous return. increased total blood vessel length. increased heart rate. increased parasympathetic impulses. decreased blood vessel radius?
Answer:
The answer is definitely increase heart rate
Explanation:
Why does the left ventricle have a thicker myocardial wall?
Answer:
There are two types of ventricles; the right and the left ventricles. The ventricles are large chambers located in the heart, which receive blood from atria. The major function of the ventricles is to pump blood throughout the body. In order to carry out their function of pumping blood very well, the ventricles have thicker myocardial wall compare to the atria. The thick myocardial walls allow blood to be pumped out of the heart at greater pressures.
The left ventricle has a thicker myocardial wall as it needs to generate substantial pressure to pump blood into the long systemic circuit. The myocardium's structure, including its complex muscle pattern, aids in its functionality. In contrast, the right ventricle services a shorter circuit with less resistance, so it doesn't require as thick a wall.
Explanation:The left ventricle in the human heart is structurally designed to accommodate a higher workload than the right ventricle. Its myocardial wall is thicker because the left ventricle needs to generate a substantial amount of pressure to pump blood into the long systemic circuit. The muscular thickness of the ventricles is directly proportional to the resistance they have to overcome.
Furthermore, the muscle pattern of the myocardium, which forms a complex swirling pattern around the heart chambers, adds to its efficiency. The myocardium is the thickest layer of the heart, made largely of cardiac muscle cells, built on a framework of collagenous fibers, blood vessels, and nerve fibers that regulate the heart.
In contrast, the right ventricle doesn't need to generate as much pressure since the pulmonary circuit it services is shorter and provides less resistance. Therefore, its wall is not as thick as the left ventricle. Hence, the thickness in the myocardial wall of the left ventricle is a structural adaptation to its function and workload.
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Which polysaccharide is an important component in the structure of many animals and fungi?
a. amylopectin
b. chitin
c. cellulose
d. amylose?
B. Chitin
that' because both animals and fungus are eukaryotic and heterotrophic, so they share same characterstics in terms of feeding and cellular structure. In addition to both share the same protist supergroup, which is (Unikonta).
Chitin is the polysaccharide that is significant in the structure of many animals and fungi, functioning mainly as a protective and supportive component in arthropods and fungi.
Option B is correct
Explanation:The polysaccharide that functions as a crucial component in the structure of many animals and fungi is chitin. This polysaccharide is mainly found in the exoskeleton of arthropods like insects, crabs, and spiders, as well as in the cell walls of fungi. Unlike the other polysaccharides mentioned in the options, chitin has a structural role in nature, helping to provide protection and support.
In contrast, amylopectin and amylose are both components of starch, a polysaccharide used by plants for energy storage. Cellulose, on the other hand, is a polysaccharide found in the cell walls of plants, helping to maintain their structure.
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The base of the pyramid is built from organisms that primarily A) are autotrophs. B) are heterotrophs. C) consume organisms located above them.
The base of the pyramid is built from organisms that primarily are autographs.Answer: A
Which hormone prevents degeneration of the corpus luteum?
Answer:
hCG
Explanation:
The corpus luteum also called "yellow body" is the remaining of the ovarian follicle that has released a mature egg during a previous ovulation (it develops at each menstrual cycle). The corpus luteum is an endocrine structure which produces of progesterone, estradiol and inhibin A.
If egg released during the ovulation becomes fertilized, human chorionic gonadotropin (hCG) secreted by the cells of the blastocyst signals the corpus luteum to continue progesterone secretion.The role of the corpus luteum is to maintain endometrium of the uterus and provide an area rich in blood vessels for the zygote's development.
17. For a virus, what advantages and disadvantages does the lytic lifecycle have compared with the lysogenic lifecycle? A. The lytic lifecycle allows a virus to wait until conditions are optimal before reproducing but also gives the host cell more time to detect and fight the virus. B. The lytic lifecycle ensures that the virus won't be detected by the host cell but also kills the host and forces the virus to find a new host cell. C. The lytic lifecycle allows viruses to reproduce more quickly but also kills the host and forces the virus to find a new host cell. D. The lytic lifecycle allows viruses to reproduce when the host cell reproduces, spreading to its daughter cells, but also gives the host cell more time to detect and fight the virus. Mark for review (Will be highlighted on the review page)
Answer:
C. The lytic lifecycle allows viruses to reproduce more quickly but also kills the host and forces the virus to find a new host cell.
Explanation:
The lytic lifestyle of the viruses (e.g. bacteriophage) can be described through the next steps:
attachment and injection into the host cell (e.g.bacterial cell)synthesis of the early virus proteins which break down host's DNAvirus uses host's machinery (for the replication, transcription and translation) to produce the rest of its proteins and to form new virus particles.host cell burst and many new virus particles are released.During the lysogenic cycle, virus does not kill the host. It integrated its DNA into host's genome and stays dormant until conditions are optimal for reproduction.
Answer:c
Explanation:
The mating strategy in which a female mates with multiple males is
Answer to this is Polygamy
Hershey and Chase set out to determine what molecule served as the unit of inheritance. They completed a series of experiments in which E. coli was infected by a T2 virus. Which molecular component of the T2 virus actually ended up inside the cell?A) proteinB) RNAC) ribosomeD) DNA
Answer:
The correct option is D.
Explanation:
In the year 1952, two scientists, Hershey and Chase conducted a series of experiments that helped to establish the fact that DNA is a genetic material. The DNA is located inside the nucleus of living cells in form of chromosomes and its the determinant of traits that are found in living organisms. During protein synthesis, the information in the DNA molecule is encoded into an RNA molecule and this is used in the production of protein, thus, DNA actually directs all the happen in the living cells.
Hershey and Chase conducted an experiment in 1952 that proved DNA is the molecule carrying genetic information. They demonstrated this by infecting E. coli cells with T2 bacteriophage - a virus - and discovered that only the DNA from the bacteriophage ended up inside the cells.
Explanation:The answer to your question lies in a series of experiments conducted by Alfred Hershey and Martha Chase in 1952. They were investigating the molecular component of the T2 bacteriophage, a type of virus, that ended up inside E. coli cells it infected.
Using two separate batches of phage, they used radioactive sulfur, ³⁵S, to label the protein coats of one batch, and radioactive phosphorus, ³²P, to label the DNA of the other batch. After infection, they separated the phage and cells and discovered that only the phage batch radiolabeled with ³²P ended up inside the bacterial cells. This confirmed that it was the DNA, not protein, that was injected into the cell and served as the genetic material.
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A particular E. coli cell contains a lac operon that continuously breaks down lactose into glucose and galactose. What could be a possible explanation for this occurrence? Select one: a. Beta-galactosidase is being inhibited by an allosteric inhibitor. b. The I gene in the lac operon is mutated and does not encode for the lac repressor. c. This particular E. coli cell does not use glucose as a viable sugar source. d. The lac repressor has a mutation in the lactose binding site. e. The operator has a mutation that does not allow the RNA polymerase to bind to it.
Answer:
b
Explanation:
i think
Which of the following statements about the genetic code is true?
a. A Codon can specify more than one amino acid.
b. Every codon specifies a different amino acid.
c. Some codons specify the same amino acid.
d. Some codons have no function at all.
Answer:
c. Some codons specify the same amino acid.
Explanation:
Codons are triplets of nucleotides in mRNA that is used for the protein synthesis (translation). A codon specifies a single amino acid, but there are exceptions. tRNA molecule contain anticodons, triplets of nucleotides that are complementary to codons. So, during the translation, tRNA carries the amino acid, that corresponds to the codon in mRNA.
The correct statement about the genetic code is: c. Some codons specify the same amino acid. This is because multiple codons can specify the same amino acid due to the degeneracy of the genetic code. No single codon can specify more than one amino acid and every codon has a function either as an amino acid or a stop signal.
Explanation:The subject of this question is the genetic code and how it translates into amino acids. The correct statement about the genetic code is c. Some codons specify the same amino acid. This is due to the genetic code's degeneracy, which allows for the specification of the same amino acid by several codons. For instance, there are six distinct codons that can specify the amino acid leucine. However, no single codon can specify more than one amino acid, making the option wrong. Every codon does have a function as either an amino acid or as a stop signal in protein synthesis, making option d incorrect as well.
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In lacI —mutant cells, when there are high levels of glucose present but no lactose, how much β-galactosidase will be produced? See Section 18.2 (Page 371) . View Available Hint(s) In lacI —mutant cells, when there are high levels of glucose present but no lactose, how much β-galactosidase will be produced? See Section 18.2 (Page 371) . A low amount A great deal It depends on what other sugars are present in the growth medium. Essentially none
In lacI mutant cells with high glucose and no lactose, essentially no β-galactosidase is produced due to the absence of lactose to inactivate the dysfunctional repressor and the presence of glucose which keeps cAMP levels low, resulting in inactivity of the CAP.
In lacI —mutant cells, when high levels of glucose are present and no lactose is available, essentially no β-galactosidase will be produced. This is due to the fact that the lac repressor in a lacI mutant is non-functional, and cannot properly respond to the presence of lactose. However, the presence of high glucose levels prevents the catabolite activator protein (CAP) from enhancing transcription at the lac operon. Essentially, in the absence of lactose, there is no inducer to inactivate the repressor and no β-galactosidase activity. Moreover, high glucose levels decrease the cyclic AMP (cAMP) levels, leading to an inactive CAP which cannot increase transcription of the lac operon. Thus, the concentration of β-galactosidase remains low or nonexistent.
How do limiting factors impact local ecosystems?Limiting factors prevent populations in ecosystems from growing any larger. If any of the limiting factors change, animal and plant populations change, too.Limiting factors do not prevent populations in ecosystems from growing any larger. If any of the limiting factors change, animal and plant populations do not change, too.Limiting factors can never impact ecosystems.As biodiversity of an ecosystem increases, the ability to withstand environmental stress due to the loss of a single species or group also increases, improving the sustainability of the ecosystem.
Answer:
If any of the limiting factors change, animal and plant populations change, too.
Explanation:
it changes it's either it's increasing or the other way around. if it's not favourable organisms leave increasing the population of the other area.
If any of the limiting factors change, animal and plant populations change, too.
Explain how limiting factors change, animal and plant populations change?
it changes it's either it's increasing or the other way around.
if it's not favourable organisms leave increasing the population of the other area.
Thus, option "B" is correct, If any of the limiting factors change, animal and plant populations change, too.
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Taste buds are the sensory structures found on certain?
The tongue is the muscle from which an animals/human taste sense comes from. It is covered in taste buds, a special nerve sensor to only the tongue.
What is sensory system?A sensory system is defined as the sensory neurons, neural pathways, and parts of the brain which involved in sensory perception.
Commonly recognized sensory systems are those for hearing, vision, touch, smell, taste, and balance.
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Taste buds are sensory structures on the tongue responsible for the sense of taste. They consist of chemoreceptor cells, each sensitive to different taste qualities such as sweet, salty, sour, bitter, and umami, and relay information to the brain.
Taste buds are the sensory structures found on certain raised bumps on the tongue, known as papillae. These buds are primarily located on the tongue and are composed of chemoreceptor cells (gustatory, sustentacular, and basal cells) that sense and transmit the sensation of taste to the brain. Taste receptors within these buds make contact with chemicals in food through taste pores. When chemicals bind with these cells, nerve impulses travel to the central nervous system (CNS). The tongue has different receptor types for detecting sweet, salty, sour, bitter, and umami (meaty or savory) tastes, activating sensory neurons that communicate with the brain.
One function of _____ tissue is to hold organs and other tissue in place. epithelial connective nervous muscular
Answer:
connective
Explanation:
a key term is "connect" it hold it together with this
hope this helps : )
Connective tissue is the correct answer
What is the correct order of processes involving the movement of oxygen from the environment to mitochondria in vertebrates?
Answer:
a.) ventilation, circulation, cellular respiration
Explanation:
a.) ventilation, circulation, cellular respiration
b.) diffusion in tissues, cellular respiration, diffusion at respiratory surface
c.) ventilation, diffusion in tissues, circulation
d.) circulation, cellular respiration, diffusion in tissues
e.) circulation, ventilation, cellular respiration
Ventilation occurs in the lungs and is the process by which carbon dioxide in the capillaries is lost to the environment while oxygen is taken in. Circulation is the process by which this dissolved oxygen is taken by the blood to tissues around the body. When this oxygen is taken to tissue, the concentration gradient allows the oxygen to be taken up by tissue. This oxygen is used as an electron acceptor (when it reduced to water) in the mitochondria during electron transport chain of cellular respiration.
causes and effect (climate change)
Answer; green house effect because of the ozone layer deteriorating
Explanation:
Answer:
Climate change refers to the global changes in the climate, that are caused due to the changes that occur in terms of precipitation, wind pattern, surface temperature, and other climatic factors.
It is caused due to the increasing amount of greenhouse gases such as carbon dioxide, water vapor, methane and chlorofluorocarbon in the atmosphere that depletes the ozone layer. These gases are released from vehicles, industries, and factories. Deforestation also leads to an increasing amount of global surface temperature.
The effects of climate change are the increasing and decreasing amount of sea level, global rise and fall of surface temperature, as a result of which the ecosystem at various places are affected significantly.
What controls which dna is amplified in pcr?
Answer:
Primers
Explanation:
PCR or Polymerase Chain Reaction is in vitro techinque, widely used for production of DNA copies of a specific DNA region. The major components of this reaction are thermostable enzyme Taq polymerase and primers designed for specif region of DNA that is region of interest.
PCR reaction is repeatedly cycled through a series of temperature changes, and the purpose of it is to make as much amplified DNA sequences for further investigations.
In PCR, the DNA segment that gets amplified is controlled by the sequence of the primers. The thermocycler conducts temperature changes necessary for denaturing, annealing, and extending DNA. Post-PCR, products are checked via electrophoresis and careful practices are essential to prevent contamination.
The process that controls which DNA is amplified in PCR (Polymerase Chain Reaction) is primarily determined by the sequence of the primers used in the reaction. These primers are short pieces of DNA that are designed to be complementary to the specific regions of the template DNA that one intends to amplify. Therefore, by controlling the primers' sequences, experimenters can target exactly what segment of DNA is replicated.
During PCR, thermal cycling is employed to change temperatures in a way that facilitates the replication process. The thermocycler machine is responsible for raising and lowering the temperatures for denaturing the DNA, annealing the primers, and extending the new DNA strands. Each of these steps occurs at a different temperature, with the entire amplification process being completed rapidly.
Post-amplification, the PCR product is typically checked on an electrophoretic gel to confirm the successful amplification of DNA of the expected size. PCR not only allows for selective replication of a specific DNA segment but also requires stringent practices to avoid contamination, which can greatly affect the results due to the high sensitivity and amplification capabilities of PCR.
E. within this feedback loop, do the signals from the response change in magnitude (lesser, greater) or direction (positive, negative)?
Answer
the answer is lesser i did a test on it
Which of the following does NOT occur during the Calvin cycle?carbon fixationconsumption of ATPrelease of oxygenoxidation of NADPHregeneration of the CO2 acceptor
I’m fairly sure it’s the last choice. I hope I was helpful
This cold river of air travels from west to east in the northern hemisphere. Last winter, it dipped far south to bring cold air and snow to many southern states. This is the A) Hadley wind. B) polar jet stream. C) Arctic jet stream. D) tropical jet stream.
Answer: The answer is polar jet stream because the polar jet stream dips low over the Northern United States during the winter to bring cold air. In the summer, the jet stream retreats and brings cool air to the Northern United States.
Explanation:
Which of the following statements correctly describes the effect a nonsense mutation would have on a gene?a) It changes an amino acid in the encoded protein.b) It alters the reading frame of the mRNA.c) It introduces a premature stop codon into the mRNA.d) It has no effect on the amino acid sequence of the encoded protein.
Answer:
c) It introduces a premature stop codon into the mRNA
Explanation:
Nonsense mutation is a type of point mutation (single nucleotide base is changed) which leads to premature stop codon. Stop codons are also called nonsense codons and that is way this type of mutation is called nonsense mutation. As a consequence, synthesized protein is incomplete and shorter than it should be (truncated protein), usually nonfunctional.
Which of the following parts in the human body cannot be infected by a virus? a) none of the above, as they can all be infected by virusesb) blood cellsc) braind) skeletal muscle
a) none of the above, as they can all be infected by viruses.
selling food locally increases sustainable use of the land because crops can be rotated more easily. what is another benefit of this practice?
Answer:
Less CO2 emitted from transportation
Explanation:
The other answer options don't make as much sense, since it would basically be from farm to table, answers B and D don't make sense. As for C, farmers would probably end up making more and if not the same, because they'd be able to directly sell a higher percentage of their yieldings from the crop because little to no transportation is required (less bruised or damaged goods) and the store or supermarket they sell it in wouldn't be taking a percentage of their earnings.
Another benefit of the particles is there is less CO2 emitted from transportation. Option A is correct.
What is selling food locally?When the farmers produce food, they sell the food to earn money. Farmers sell their food out in the city to get more prices. Selling food locally means selling the product in the same place where it grows.
Selling the food locally cuts the cost of vehicles, and also it's eco-friendly because greenhouse gases will be less emitted.
Thus, option A, There is less CO2 emitted from transportation, is correct.
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The options are attached to the image.
What would be the most likely result of cutting down a rainforest and planting a coffee crop?
a
a decrease in erosion
b
a decrease in biodiversity
c
an increase in available fresh water
d
an increase in photosynthetic activity
Answer: B
Explanation: A decrease in biodiversity
What will most likely happen if a new producer is introduced into a food web? A) The omnivores will decrease. B) The herbivores will increase. C) The carnivores will decrease. D) The decomposers will decrease
B) the Herbivores will increase