at the end of which week of the ovarian cycle should implantation occur (assuming there is an embryo)?
Answer:
first week
Explanation:
it takes 2 to 3 days tk get embryo
in multiple sclerosis the myelin sheaths around the axons of the brain and spinal cord are damaged and demyelination results. how does this disease manifest at the level of the action potential? i) action potentials move in the opposite direction on the axon. ii) action potentials move more slowly along the axon. iii) no action potentials are transmitted. in multiple sclerosis the myelin sheaths around the axons of the brain and spinal cord are damaged and demyelination results. how does this disease manifest at the level of the action potential? i) action potentials move in the opposite direction on the axon. ii) action potentials move more slowly along the axon. iii) no action potentials are transmitted. only i only ii only iii only ii and iii request answer
This attack causes inflammation and injury to the nerve sheath and ultimately to the surrounding nerve fibers. The process can result in multiple areas of scarring.
When the myelin sheath is damaged, the nerves do not conduct electrical impulses normally. Sometimes nerve fibers are also damaged. If the sheath can be repaired and regenerated, normal nerve function can return. However, if the sheath is severely damaged, the underlying nerve fiber may die. Your bodys immune system produces inflammatory substances that damage myelin and eventually kill the cells, oligodendrocytes, and Schwann cells that produce myelin. Where the myelin is attacked determines your symptoms. The destruction of the myelin sheath is called demyelination. Axonal demyelination leads to an increase in the refractory period for propagation of the action potential. Computer simulations were used to investigate the mechanism by which changes in the passive properties of the internodal membrane increase the refractory period.
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The wings of species X and Y are built on same basic pattern but are modified for flying. Based on the statement, discuss the type of evolution they represent.
Biologists can explain how a species of fly without wings evolved from an ancestral fly species with wings through environmental adeptness.
The wings of species X and Y are built on same basic pattern but are modified for flying?Environmental change is any change in an ecosystem or environment that warrens adaptability from the inhabiting organisms in order to survive. The ability to adapt to these changes is known as environmental adeptness. This is a form of evolution in which an organism will generate or loose characteristics in response to changes in its way of life.Biologist can explain how a species of fly without wings evolved from an ancestral fly species with wings through environmental adeptness because the presence of unnecessary wings would have caused the expenditure of energy with no benefit to the fly, therefore, the offspring of a fly who lives in an environment which has no need for the ability to fly will gradually loose their wings in order to retain more energy and function more efficiently. This is evolution through environmental adaptedness.Many species share much the same DNA: All living things have DNA molecules that encode all genetic information. Among living things there are similarities and sharing of parts of DNA. This is strong evidence of species evolution. An example of this is the similarity between humans and chimpanzees.Plant and animal cells have almost all of the same structures: Although there are some differences, plant and animal cells share almost all cell structures. This is a strong indication of how life has evolved on our planet.To learn more about species and wings refer to:
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what type of cavity treatment involves making an incision from the xiphoid process to the pubic symphysis instead of using a trocar?
Direct incision treatment involves making an incision from the xiphoid process to the pubic symphysis instead of using a trocar.
This occurs when esophageal acid from the stomach backs up. Since the oesophagus is situated beneath the breastbone and can get inflamed as a result of acid reflux, xiphoid process pain may also arise. Heart disease is one of the other causes of xiphoid process pain.
The sternum's xiphoid process is painfully swollen and uncomfortable when someone has xiphoid syndrome. The xiphoid process becomes inflamed, resulting in xiphodynia, as a result of mechanical trauma to that anatomical area. Since there is little information available on this uncommon condition, the prevalence of xiphoid syndrome is unknown.
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scientists believe that perching birds originated on the continents of australia and antarctica. how would these scientists explain the discovery of ancient perching bird fossils in africa?
The concept that dinosaurs were the direct ancestors of birds was backed by new research on ancient specimens as well as by field finds of dinosaur and early bird species.
Numerous traits and behaviours that distinguish modern birds were also present in dinosaur forebears. Theropods were a class of meat-eating dinosaurs from which birds descended. Although birds originated from little theropods rather than gigantic ones like Tyrannosaurus rex, they nonetheless belong to the same group as the dinosaur. The earliest fossilised bird remains date back 150 million years. Since they have a foot structure that enables them to grip branches, many bird species, including the majority of songbirds, are also known as "perching birds." The shape of one toe at the back of the foot works as a pincher, stabilising the perched bird.
The complete question is:
Scientists believe that perching birds originated on the continents of Australia and Antarctica. How would these scientists explain the discovery of ancient perching bird fossils in Africa? A) At one time, the climate in Earth was consistent throughout the planet. B) The fossils may have been moved by man, animals, or Earth’s constructive and destructive processes. C) The birds originated in Africa, but migrated with human populations to Australia and Antarctica to Africa. D) During the life of Pangea, Antarctica, Australia and Africa were neighboring
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Which of the following best describes the result of meiosis? Select 3 that apply.
WILL GIVE BRAINLIEST
The result of the process of meiosis is that it produces increased genetic diversity due to crossing over.
The correct option is C.
What is meiosis?Meiosis is a type of cell division that results in the production of gametes or sex cells. Hence. meiosis is a form of cell division that occurs only during sexual reproduction.
During meiosis, the cells of the parent organism which have a pair of chromosomes or diploid number or 2n of chromosomes divide to produce the gametes which have the haploid number or n number of chromosomes.
Hence, the sex cells or gametes produced can fuse to form a zygote that has a pair of chromosomes or diploid number or 2n of chromosomes.
The process of meiosis results in genetic variation as it allows for the crossing over of genes, such that the genes of the offspring show a variation to that of the parents as well as among the offspring.
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Remote sensing data helps scientists improve their understanding and predictions about climate change.
a. True
b. False
Remote sensing data helps scientists improve their understanding and predictions about climate change. This is a true statement.
It allows for the monitoring of Earth's surface, oceans, and atmosphere at various spatiotemporal scales, enabling the study of processes or long- and short-term events related to the climate.
Remotele sensing photos, which are captured with specialised cameras, are used by scientists to "feel" the Earth. Examples include: We can see considerably more from the air and space than we can from the ground because of the cameras on satellites and aircraft that snap photographs of large swaths of the Earth's surface.
For example, isotope ratios, elemental analysis, biomarkers, and biogenic silica are examples of chemical proxy records. When combined, these proxies allow us to recreate the climate from hundreds of millions of years ago.
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Why are the differences between prokaryotic and eukaryotic translation of mRNA useful to humans?
For the regulation of genes during nutritional shortage and stress, development and differentiation, nervous system function, aging, and illness, translational control in eukaryotic cells is essential. Prokaryotes are able to respond quickly to environmental cues because transcription and translation happen simultaneously in the cytoplasm.
what are Prokaryotes ?Any organism without internal membranes is referred to as a prokaryote, usually written procaryote. These organisms lack a defined nucleus and other organelles.
what is eukaryotic ?eukaryotic can be explained as a living things with nuclei in their cells. Eukaryotes include all animals, all plants, all fungi, and many unicellular creatures.
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Explain why the potential energy increases when ice starts to melt and becomes liquid water.
Enter your answer in the space below.
swer inside this box
Answer:
Explanation:
While the ice melts kinetic energy is being added to the particles. This breaks the bond and causes a change of state making the solid become a liquid.
Blood pressure is usually measured in the ________ artery with a sphygmomanometer.
at which level(s) is eukaryotic gene expression regulated? a. post-translation b. translation and post-translation c. transcription d. transcription and translation e. transcription and post-transcription f. transcription, post-transcription, and translation g. translation h. transcription, post-transcription, translation, and post-translation i. post-transcription
Transcription, post-transcription, translation, and post-translation . DNA is keep within the nucleus of organism cells, wherever it'stranslated into mRNA.
The freshly created mRNA is then taken from the nucleus and placed within the protoplasm, wherever ribosomes convert it into supermolecule. The nuclear membrane physically separates the processes of transcription and translation; transcription solely takes place within the nucleus, and translation solely takes place outside the nucleus, within the protoplasm. At any purpose within the method, organic phenomenon isregulated.
Regulation might manifest itself at the epigenetic level, the transcriptional level, the post transcriptional level , the translational level or once the super molecule has been made(post-translational level).
Regulation might manifest itself at the epigenetic level (when DNA is uncurled and discharged from nucleosomes to bind transcription factors), the transcriptional level (when polymer is produced), the post-transcriptional level (when polymer is processed and exported to the cytoplasm), the interpretation level (when polymer is translated into protein), or the post-protein level (when the supermolecule has been produced) (post-translational level).
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The founder effect is an example of _______.
Answer:
The founder effect is an example of genetic drift
explanation:A population has members with the same appearance and features, such members encounter similar problems in the environment they live in. Some members of the population start living in a different place due to some reason. In that new area, they form a colony and start to adapt to different environments. This is called the founder effect. This brings change into sets of genes causing genetic drift.
Which explains the role of a gene
The role of a gene is to transmit as physical and functional units the inheritance characters from one generation to the next.
What is a gene sequence?A gene sequence is a given fragment of a single strand of the DNA molecule which contains a specific linear order of nucleotides that is used to synthesize a cognate RNA molecule such as a messenger RNA or mRNA, a sequence that then serves as a template in order to generate a protein by a process called translation.
The genes are considered the physical and functional unit of inheritance because it contains the information to transmit a particular phenotypic character.
Therefore, with this data, we can see that a gene sequence is a given fragment of DNA that may serve to create a protein in the individual and it serves to transmit phenotypic features from parents to offspring.
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Name a product of cellular respiration that is used as a reactant in photosynthesis? (SC.912.L.18.9)
02
O ATP
Glucose
CO 2
Carbon dioxide is a product of cellular respiration that is used as a reactant in photosynthesis (option 4).
What are the processes of photosynthesis and cellular respiration?Photosynthesis is a metabolic pathway that plants and algae use to generate simple carbs such as glucose by using reactant carbon dioxide, water, and also sunlight.
Conversely, cellular respiration is a series of chemical reactions used by all aerobic cells in order to generate ATP, which is considered the energy coin of the cells. In cellular respiration, the reactants include foods such as glucose molecules and oxygen, while the products of this pathway include carbon dioxide and also the generation of ATP.
Therefore, with this data, we can see that photosynthesis and cellular respiration are different in terms of reactants and products and both metabolic pathways may be considered complementary in terms of the generation and use of substrates.
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sexual selection in a population choose one: a. can lead to physical differences between the males and females of a species. b. does not lead to evolution. c. reduces genetic variation in the population. d. always favors individuals with a higher survival potential.
The right response is option a, which states that morphological distinctions between males and females of a species can result from sexual selection in a population.
The tail of a peacock is a good illustration of partner selection. Peahens choose peacocks with huge, vibrant tails, which allows those peacocks to mate more frequently and produce younger ones. The genes for a long, colourful tail will be passed down from the father to the male peachicks, who will inherit these genes and develop comparable tails. There are two main factors that influence sexual selection. One is the preference of one sex (typically females) for members of the opposite sex who display particular features. The other is higher strength, which (often in males) results in better success in courting females.
So, we can conclude that option a, which claims that sexual selection can lead to physical differences between males and females of a species in a population, is the appropriate response.
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the dna with the gene of interest for a cloning experiment was left on the lab bench overnight (instead of storing it in the freezer). as a result, it was degraded. they didn't know the dna was left out and used it in the experiment. the plasmid, however, was stored correctly. the vector contains a gene for ampicillin resistance. after the transformation procedure, the bacteria were plated on media containing ampicillin. what results are expected from this faulty molecular cloning experiment?
In a molecular cloning procedure, the DNA to be copied is extracted from a target organism and split into smaller DNA fragments in a test tube using enzymes.
These pieces are subsequently joined with vector DNA to produce recombinant DNA molecules. After that, a host organism is given the recombinant DNA (typically an easy-to-grow,strain of E. coli bacteria). Recombinant DNA molecules will be duplicated alongside the host DNA in the resulting population of organisms. These are transgenic or genetically modified organisms because they have foreign DNA pieces. Thus, the term "clone" is frequently used to describe both the bacterial population and the recombinant DNA molecule. In actuality, molecular cloning refers to the scientific techniques utilised to put them together.The idea arose that different DNA sequences could be inserted into a plasmid and that these foreign sequences would be carried into bacteria and digested as part of the plasmid. That is, these plasmids could serve as cloning vectors to carry genes.
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if natural fires and herbivores can both reduce the abundance of competitively superior plants, how should this affect the number of other plant species that can persist in the community?
It can cause woody plants to proliferate and outcompete plants that have adapted to fire, reducing the number of plant species that can survive in the community.
Resources are often scarce in a habitat, and many species could compete for them. Plants in a garden, for example, may compete for soil nutrients, water, as well as light. Interspecific competition has a negative overall effect on both species involved. That is, if the other species did not exist, each species would fare better.
Interspecies competition occurs when two species compete for the same limited resource. Both species suffer as a result of competition. The ecological role of a species is defined by the set of conditions, resources, as well as interactions that it requires. According to the competitive exclusion principle, two species cannot coexist if they occupy the same niche.
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PLS HELP!!!!
Which option best describes a scientific consensus?(1 point)
A. a general agreement among a few scientists that is supported by experimentation and investigation
B. an observation made by a scientist that is supported by experimentation and investigation
C. a general agreement among many scientists that is supported by evidence and reasoning
D. an observation made by a scientist that is supported by evidence and reasoning
_______________________________________________________
How is “lock and key” used to describe the action of enzymes? (1 point)
A. Enzymes are able to create gaps in cell walls that allow products to leave cells.
B. Enzymes have a shape that specifically fits the reactants, like a key in a lock.
C. Enzymes have a shape that specifically fits the reactants, like a key in a lock.
D. Enzymes have a shape that specifically fits the products, like a key in a lock.
The option that best describes a scientific consensus is a general agreement among many scientists that are supported by evidence and reasoning.
The correct option is C.
The lock and key model of enzyme catalysis is described as follows:
Enzymes have a shape that specifically fits the reactants, like a key in a lock.
The correct option is B.
What is a scientific consensus?A scientific consensus is a common agreement about a particular idea or theory that has achieved general acceptance among scientists.
A scientific consensus is arrived at after several corresponding experiments or research on a particular theory or idea by scientists all over the world.
When a scientific consensus is reached, the idea becomes a theory upon which other scientific ideas are based on and used to explain other ideas.
Enzymes are specific in their action and the mechanism of their action has been described using the lock and key model.
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here is a portion of a hypothetical dna sequence: 3' t t c g a a c c g a g 5' suppose this sequence is part of the template strand of a gene. the sequence of the rna transcript produced from this part of the gene would be:
Answer:
sequence of the RNA transcript produced from this part of the gene would be:
5' A A G C U U G G C U C 3'
Explanation:
The RNA transcript is produced by transcribing the DNA sequence into RNA using the enzyme RNA polymerase. During transcription, RNA polymerase reads the DNA sequence and uses it as a template to synthesize the complementary RNA sequence. Because RNA is single-stranded and DNA is double-stranded, the RNA transcript is complementary to the non-template strand of the DNA, not the template strand.
In the given DNA sequence, the non-template strand would be:
3' A A C G T T G G C T G 5'
The RNA transcript is produced by transcribing this non-template strand, so the resulting RNA sequence would be the complementary sequence:
5' A A G C U U G G C U C 3'
This RNA transcript would be the sequence of the RNA produced from the given DNA sequence.
you are trying to identify an organism. this organism contains no muscle tissue. it is not diploblastic. it must be a
You are trying to identify an organism. It is an animal, but it does not have nerve or muscle tissue. It is neither diploblastic nor triploblastic. It is probably a sponge.
Ectoderm and endoderm are the two principal germ layers in a blastula that has diploblasty. Cnidaria and ctenophora are examples of diploblastic species, which arise from such blastulae and were once included in the phylum Coelenterata but were later split off due to greater understanding of their differences.
They can grow genuine tissue because of the endoderm. The gut tissue and related glands are included in this. On the other hand, the ectoderm develops into the epidermis, the nervous system, and, if any nephridia are present.
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Which of the following is a characteristic of offspring produced by meiosis, and does not characterize offspring produced by mitosis?
A.
four haploid cells with chromosomes and alleles that are genetically different than the parents
B.
four haploid cells with chromosomes and alleles that are genetically identical to the parents
C.
two diploid cells with chromosomes and alleles that that are genetically different than the parents
D.
two diploid cells with chromosomes and alleles that are genetically identical to the parents
Answer:
the answer is B I did this last week
Order the steps that occur as a protein is synthesized within a cell and finally excreted for use outside of the cell.
Answer:
1. The protein is synthesized within the cell using the information in the cell's DNA.
2. The protein is folded into its final shape.
3. The protein is transported to the cell membrane.
4. The protein is excreted from the cell, typically with the help of special protein-transporting molecules.
5. The protein is now outside of the cell and can be used for its intended purpose.
Explanation:
1. as you travel up through the atmosphere it gets colder and colder the rate at which it gets colder is called the _______ rate and it is about ____ c per km of altitude
2. the less atmosphere over our heads, the _________ the lower the atmospheric pressure
3 the atmosphere weighs_______ kg per cubic centimeter
the atmosphere keeps the earth warm when light from the sun is reflected back from the earth as heat and trapped in the atmosphere it is called the _________
3. __________ smog occurs when sunlight reacts with chemicals from car exhaust
4. when coal is burned to make electricity it produces sulfur when the sulfur combines with rain to make sulfuric acids it is called _________
As you travel up through the atmosphere it gets colder and colder the rate at which it gets colder is called the "lapse rate" and it is about 6.5°C per km of altitude.
2. The less atmosphere over our heads, the "thinner" the lower the atmospheric pressure.
3. The atmosphere weighs about 1.2 kg per cubic centimeter. The atmosphere keeps the earth warm when light from the sun is reflected back from the earth as heat and trapped in the atmosphere it is called the "greenhouse effect."
3. "Photochemical smog" occurs when sunlight reacts with chemicals from car exhaust.
4. When coal is burned to make electricity it produces sulfur. When the sulfur combines with rain to make sulfuric acids it is called "acid rain."
What is lapse rate?The lapse rate is the rate at which the temperature of the atmosphere decreases with an increase in altitude. It is usually expressed in degrees Celsius per kilometer of altitude.
The lapse rate is important because it determines how the temperature of the atmosphere changes with altitude, which in turn affects the formation of clouds and precipitation. The average lapse rate in the Earth's lower atmosphere is about 6.5°C per kilometer of altitude, but it can vary depending on local weather conditions and other factors.
Therefore, In general, the lapse rate decreases with an increase in humidity and the presence of clouds, and it increases with a decrease in humidity and the absence of clouds.
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homo habilis displays a great deal of variability some scientists think that larger homo habilis fossils with wider faces and bigger teeth should be classified in their own species called
This cranium has a wider, flatter face, a larger brain, and larger teeth than other Homo habilis fossils, prompting some scientists to name it Homo rudolfensis.
The word habilis is based on a Latin word meaning 'handy' or 'skilful'. This species is known as "handy man" because stone tools were discovered near its fossil remains, and it is assumed that this species developed the ability to shape stone into tools. The following year, parts of a boy's skeleton were discovered at the site, and additional fossils from other people were discovered. Their brain size, hand and foot features, and evidence that they may have used stone tools all suggested that a new type of human ancestor had been discovered.
Their brain size, hand and foot features, and evidence that they may have utilised stone tools all suggested that a new type of human ancestor had been discovered. They were officially recognised as new species in 1964, but their inclusion in the human genus Homo was contentious. Additional fossils, including the 1986 discovery of a partial skeleton, revealed that this species was more ape-like than previously thought.
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Select all true statements regarding gamma decay.
Gamma rays are the spectral particles with the highest energy and shortest wavelength. This form of decay does not result in the release of any particles from the nucleus.
What is a nucleus, and what does it do?The spindle holds the alleles, which are the structures that house the genetic traits, and governs and regulates the functions of the cell. The nucleoplasm is the gel-like membrane that contains the nuclear parts are suspended.
Why is the nucleus the most significant cell?Due to its role in the storage, retrieval, and copying of genetic material, the nucleus is regarded as among the most significant components of eukaryotic cells. The genetic material is housed in an organelle with two membranes.
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Our sense of taste originally was thought to involve only the following four
sensations
A) sweet, salty, starch, and bitter.
B) salty, fatty, bitter, and sweet.
C) sour, bitter, sweet, and starchy.
D) bitter, sweet, sour, and salty.
E) fruity, fatty, silky, and coarse.
Answer:
D) bitter, sweet, sour, and salty
Explanation:
Our sense of taste originally was thought to involve only the following four sensations: bitter, sweet, sour, and salty. These four sensations are the primary tastes that humans can detect, and they are thought to be the basis of our sense of taste. Other tastes, such as fat and umami (savory), are thought to be detected by other senses, such as touch and smell.
Answer: C
Explanation:
A primary difference between transcription and replication is that transcription
Answer: Replication is the duplication of two-strands of DNA.
Explanation:
Transcription is the formation of single, identical RNA from the two-stranded DNA.
Normal cells have a contact inhibition feedback mechanism that prevents the cells
from replicating when other cells are touched. A diagram of cells with contact
inhibition and cells without contact inhibition is shown.
Which statement best describes what will happen to cells in an organism that lack
contact inhibition?
ANSWER CHOICES
The cells will stop replicating once one layer is produced as other body cells will crowd them out.
The cells replicate into the food supply for each cell is used, causing each cell to die
The cells will continue to grow causing a tumor in the body
The cells will replicate normally replacing body cells that die
The statement that best describes what will happen to cells in an organism that lacks contact inhibition is that the cells will continue to grow to cause a tumor in the body.
The correct option is C.
Contact inhibition refers to a process by which cells that are growing when they come in contact with each other will stop the growth of more cells.
Contact inhibition is a form of feedback inhibition mechanism that enables cells to prevent the excessive growth of cells in the body.
Normal cells have a contact inhibition feedback mechanism. However, some cells lack this feedback mechanism of regulation. Hence, the cells have excessive growth resulting in the formation of tumors.
Examples of cells that lack this feedback mechanism of regulation are cancer cells.
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which division of the piriform cortex produces representations of the features of odorant molecules?
The anterior division of the piriform cortex produces representations of the features of odorant molecules.
Piriform cortex is a region of the brain also called as pyriform cortex, situated in the cerebrum region. Its function is to regulate the mechanisms of the olfactory experiences. It is at the junction of the temporal and frontal lobes.
Odorant molecules are the ligands that bind to the odorant receptors present at the neurons of the body involved in the olfactory responses. They are names odorants because they perceive smell. The receptors of the odorant molecules are GPCRs. Odorants are of various types based on the type of functional group they possess.
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Which of these shows an example of an insertion mutation?
The figure 3 shows an example of an insertion mutation.
What do you mean by insertion mutation?
An insertion is the addition of one or more nucleotide base pairs into a DNA sequence. This can often happen in microsatellite regions due to the DNA polymerase slipping.
Moreover, an insertion changes the DNA sequence by adding one or more nucleotides to the gene. As a result, the protein made from the gene may not function properly.
An insertion mutation occurs when an extra nucleotide is added to the DNA strand during replication. This can happen when the replicating strand "slips," or wrinkles, which allows the extra nucleotide to be incorporated.
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