In a large artery, the external elastic membrane is the layer that lies between the tunica media and tunica externa.
What is a large vein's tunica externa?The outermost tunica (layer) of a blood vessel, also known as the tunica adventitia (New Latin "additional coat"), is known as the tunica externa (New Latin "outer coat"). It surrounds the tunica media. It is mostly made of collagen and is supported in arteries by elastic lamina on the outside.
What are the tunica externa's layers?It is made out of the tunica intima (I), a straightened layer of endothelium; the tunica media (M), a layer of smooth muscle cells and elastic fibers (black in B); and the fibrous connective tissue known as the tunica adventitia (Ad).
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Place in order the following primate species based on their number of derived characteristics from low to high.
- lemurs
- tarsiers
- old world monkeys
- apes
- humans
The correct order of the primate species based on their number of derived characteristics from low to high is as follows:
Lemurs
Tarsiers
Old world monkeys
Apes
Humans
Lemurs are the most primitive primates, having diverged from the main primate lineage more than 60 million years ago. Tarsiers share some characteristics with lemurs, but also have some unique features that evolved later in primate evolution. Old world monkeys, apes, and humans all belong to the same group of primates called catarrhines, which evolved about 25 million years ago. Apes and humans share many derived characteristics, such as a large brain, complex social behavior, and an upright posture. However, humans have even more derived characteristics, such as bipedalism, a reduced jaw, and an enlarged brain.
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A teenager swears at the dinner table, and as a result, her parents take away her iPad for one week. The teenager is now much less likely to swear at the dinner table, illustrating:
A) positive punishment.
B) positive reinforcement.
C) negative punishment.
D) negative reinforcement.
The teenager is now much less likely to swear at the dinner table, illustrating negative punishment. Therefore, the correct option will be C.
What is Negative Punishment?Negative punishment is a behavior-reducing process. It entails the removal of a desirable stimulus or a reduction in the availability of it, resulting in a reduction in behavior's likelihood to occur. Negative punishment is demonstrated when a specific action leads to the withdrawal of a stimulus, making it less likely for that action to occur in the future.
The best example of negative punishment is where the parents of the teenage girl took away her iPad for a week after she swore at the dinner table.
Thus, the correct option will be C.
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the cells that deposit new bone tissue are the ______.
The cells that deposit new bone tissue are called osteoblasts.
A cell is the basic unit of life. It is the smallest structural and functional unit of an organism, capable of performing all the functions necessary for life. All living organisms are made up of one or more cells, and they can either be prokaryotic or eukaryotic. Cells carry out various functions, including energy production, protein synthesis, and DNA replication. They also maintain homeostasis and respond to changes in their environment.
Prokaryotic cells are found in bacteria and archaea and are characterized by lacking a membrane-bound nucleus and other organelles. Eukaryotic cells, on the other hand, are found in animals, plants, fungi, and protists and are characterized by having a membrane-bound nucleus and various organelles that carry out specific functions within the cell.
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T/F: cell division in both bacterial and eukaryotic cells produces genetically cells.
True. Prokaryotes reproduce via binary fission, which is a rather simple process. Each copy of a single chromosome attaches to a different location on the cell membrane when it multiplies.
Following this, the cell membrane begins to invade, ultimately dividing into two genetically identical bacteria. Similar methods are used to replicate mitochondria in eukaryotic cells, although the process is more challenging overall.
Mitosis, which involves dividing into two genetically identical cells, is the process by which eukaryotic cells replicate themselves. Mitosis is the process by which new cells are produced during the embryonic development and after birth, as well as by which cells that have died or shed are replaced. In humans, some cells can keep dividing even after death. These "stem cells" multiply through mitosis to produce daughter cells.
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What is it called when a foreign gene is inserted into an organism?
When a foreign gene is inserted into an organism, it is referred to as genetic engineering.
Genetic engineering is the method of modifying the genetic material of an organism, either by direct gene transfer or by selective breeding, to obtain desirable traits or to get a better understanding of the organism's genetics. It entails inserting, deleting, or changing genes in an organism's genetic code.The foreign gene is introduced into the organism by a vector. A vector is a carrier that carries genetic material from one organism to another. Plasmids, bacteriophages, and viral vectors are some of the most common vectors used in genetic engineering.
The foreign gene, for example, is isolated from its original organism and then inserted into a vector, which then carries it into the host organism.The new genetic material is then incorporated into the host organism's DNA. If it is carried out in a gamete, it will be inherited by the organism's progeny, resulting in genetic modification or genetic engineering of the species. The introduced gene might come from a different species, a natural variant of the organism, or a totally artificial construct, such as a gene designed to treat a genetic illness. The technique has a variety of uses, including biotechnology, agriculture, and medicine.
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guayule (parthenium argentatum) is a plant originating in mexico that is used to produce rubber. scientists used artificial selection to breed guayule with a relative plant from utah, parthenium ligulatum, and produced a hybrid plant that transferred cold tolerance to guayule. in this example, plant growth habits and leaf shape are components of that enabled cold tolerance, and the transferability of these traits is an example of . guayule (parthenium argentatum) is a plant originating in mexico that is used to produce rubber. scientists used artificial selection to breed guayule with a relative plant from utah, parthenium ligulatum, and produced a hybrid plant that transferred cold tolerance to guayule. in this example, plant growth habits and leaf shape are components of that enabled cold tolerance, and the transferability of these traits is an example of . sexual reproduction; variation variation; heritability genetic drift; taxonomy heritability; overproduction of offspring
In this example, plant growth habits and leaf shape are components that enabled cold tolerance, and the transferability of these traits is an example of genetic heritability.
Artificial selection is the intentional selection and breeding of organisms with desired characteristics that people can benefit from. It is performed by humans to influence the inherited traits of organisms, particularly for food production and the extraction of natural substances like rubber.
Guayule (Parthenium argentatum) is a plant that originated in Mexico and is used to create rubber.
Scientists crossed Guayule with a relative plant from Utah, Parthenium ligulate, using artificial selection, resulting in a hybrid plant that transmitted cold tolerance to Guayule.
The growth habits of plants and leaf shape are traits that contributed to cold tolerance in this case, and the transferability of these characteristics is an example of genetic heritability.
Genetic heritability is the proportion of phenotypic variation in a population that is attributable to genetic variation among individuals. In this case, the genetic variation of the hybrid plant contributed to the cold tolerance of the guayule plant.
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A mutation that actually interferes with the function of the wild-type allele by specifying polypeptides that inhibit, antagonize, or limit the activity of the wild-type polypeptide is known as:
A mutation that actually interferes with the function of the wild-type allele by specifying polypeptides that inhibit, antagonize, or limit the activity of the wild-type polypeptide is known as Dominant negative mutation.
Dominant negative mutation refers to a genetic alteration that can disrupt or prevent the action of a typical (wild-type) protein. A protein's structural or functional properties may be affected by the mutation, reducing the effectiveness of the gene. This mutation's influence can be demonstrated in a heterozygous organism, where the presence of a wild-type allele may be suppressed by the mutated allele. The allele's adverse effect is so strong that it will overcome the wild-type phenotype, making the recessive allele's influence irrelevant. Their polypeptides function by inhibiting, antagonizing, or limiting the action of a typical (wild-type) polypeptide.
However, A dominant negative mutation interferes with a protein's activity, frequently causing it to lose its ability to interact with other proteins or DNA. This results in the formation of dysfunctional protein complexes that can result in a variety of illnesses.
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how are the antennae chelipeds, other walking legs, and swimmerets related?
They're all just limbs. The long antennae are utilised to physically sense a place, such the crevice's contours.
The tiny antennules are used to detect motion in the water, which may also be a sign of food, a fling, or danger, as well as to aid the creature in smelling for food, mates, or harmful predators. The antennae in crayfish come in two pairs. The brief pair is referred to as an antennule. Food and water are tasted through antennae. The crayfish's long antennae are employed for their touch sense, which aids in helping them locate food and detect vibrations from nearby predators.
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While on a hike you find Quant plants with blue flowers and Quant plants with white flowers surrounding a secluded lake. You do the unthinkable and take four Quant plants back to the lab, none of which have flowers yet. Luckily when flowers emerge you notice that you have two plants with blue flowers and two white flower bearing plants. You allow these plants to self with the following results and then complete two crosses. 3. Progeny Number White Blue 89 Pollination Blue plant #1 (self) white plant #1 (self) Blue plant #2 (self) White plant #2 (self) 38 18 59 54 | Blue #1 x White #2 Blue #2 x white #1 62 38 How many genes are involved in Quant flower petal pigmentation? Describe type of dominance is exhibited by the genels) and alleles? What are the genotypes of the four plants you brought back to the lab? what genotypic and phenotypic ratios would you expect if you crossed Blue #1 with white #1?
There are two genes involved in Quant flower petal pigmentation, and the type of dominance exhibited is incomplete dominance and the expected phenotypic ratio will be 1:1.
What is the phenotypic ratio?The genotypes of the four plants brought back to the lab are two blue homozygous plants (BB), one white homozygous plant (ww), and one heterozygous plant (Bw). If we crossed Blue #1 with White #1, it is expected to have a genotypic ratio of 1 Blue homozygous (BB) to 1 White homozygous (ww) and a phenotypic ratio of 1 Blue flower (Bw) to 1 White flower (Bw).
The color of the flower in Quant plants can be determined by two genes involved in flower pigmentation. Each gene has two alleles, and each of the alleles shows a co-dominant expression. The genotypes of the four plants that were brought to the lab are not known. A total of four genotypes is possible. These are; White - homozygous recessive (ww), White - heterozygous (Ww), Blue - heterozygous (Bw), and Blue - homozygous dominant (BB).
In the cross of Blue #1 with white #1, the genotypic and phenotypic ratios that would be expected are as follows; Phenotypic ratio: 1: 1, Genotypic ratio: 1 WW: 1 Bw.
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The neurons that stimulate muscle contraction are called _____ neurons. sensory contractile inhibitory → motorassociation
The neurons that stimulate muscle contraction are called motor neurons. Neurons are specialized cells that communicate with one another and transfer information from one region of the brain to another.
In the nervous system, these cells are the building blocks. Neurons are responsible for transmitting electrical and chemical signals in the body, and they make up the nervous system. When it comes to transmitting signals, neurons are divided into three categories. They are sensory neurons, motor neurons, and interneurons.Motor neurons:Motor neurons are a type of neuron that helps in the transmission of signals from the brain or spinal cord to muscles or other organs. They are responsible for sending messages from the central nervous system (CNS) to the body's effector organs (muscles and glands).
The neuron that stimulates muscle contraction is known as a motor neuron. Motor neurons are involved in generating voluntary or involuntary movement of muscles. The central nervous system's motor neurons are involved in activities such as movement and posture control, while the peripheral nervous system's motor neurons control muscle contractions. In conclusion, the neurons that stimulate muscle contraction are called motor neurons.
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is the genetic code is said to be because more than one codon can specify the same amino acid?
Yes. The genetic codes have degenerates and multiple codes can specify a single amino acid.
The genetic codesYes, the genetic code is said to be degenerate or redundant because more than one codon can specify the same amino acid.
There are 20 different amino acids commonly found in proteins, but there are 64 possible codons in the genetic code, which means that most amino acids are specified by more than one codon.
This redundancy provides a degree of error tolerance to the genetic code, as a mutation in a single nucleotide may not necessarily result in a different amino acid being incorporated into the protein.
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hybridization and inbreeding are important methods used in selec-tive breeding. evaluate these methods to deter-mine how they are similar and different.
Hybridization and inbreeding are important methods used in selective breeding. These methods differ in the procedure however achieve similar goals.
What is hybridization and inbreeding?Hybridization and inbreeding are important methods used in selective breeding to produce desired traits in a species. While these methods can achieve similar goals, they have distinct differences. Hybridization involves combining two purebred plants or animals of different varieties to produce a hybrid. This can lead to increased vigor, productivity, and other desirable traits in the resulting offspring.
Inbreeding is a process of selectively breeding individuals of the same variety or breed to maintain or accentuate specific desired characteristics. This can result in a decrease in vigor, fertility, and other traits, but can also lead to increased homozygosity, which can make it easier to identify and select for desired traits.
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Researchers have found that gp41, a harpoon-like protein, resides on the surface of HIV. These researchers observed that if they interfere with the action of gp41, then HIV is unable to _____.
bind to and enter T-cells in the blood
The researchers observed that if they interfere with the action of gp41, a harpoon-like protein that resides on the surface of HIV, then HIV is unable to bind to and enter T-cells in the blood.
What is HIV?
HIV (Human Immunodeficiency Virus) is a lentivirus that causes HIV infection, which in turn causes Acquired Immunodeficiency Syndrome (AIDS). This is a lifelong disease with no cure, but medications can help people with HIV lead long, active lives.
The HIV envelope contains two glycoproteins, gp120 and gp41, which are required for virus entry into target cells.
gp120 is responsible for binding to the CD4 molecule on host cells, while gp41 is responsible for fusion between the viral and host cell membranes and entry of the virus into the cell.
The researchers found that interference with gp41 prevents HIV from binding to and entering T-cells in the blood. When gp41's activity is impeded, the virus's ability to penetrate host cells is impaired.
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how does gene regulation help conserve energy for an organism?
By selecting expressing genes, expressing genes in the most energy-efficient manner possible, conserving energy during protein synthesis, and responding to feedback mechanisms, gene regulation aids in energy conservation for an organism.
Gene regulationGene regulation enables an organism to only express the genes necessary for a given function, leading to selective gene expression. This prevents the expression of genes that are not necessary, conserving energy that would have been used for their expression.Energy-efficient gene expression: Gene regulation enables an organism to express genes in the way that uses the least amount of energy. For instance, certain genes only express themselves when a certain stimulus, such as a particular dietary or environmental factor, is present. This implies that when the stimulus is not present, the organism does not need to expend energy on expressing these genes.Gene control enables an organism to save energy during protein synthesis, which results in more energy-efficient protein synthesis.learn more about Gene regulation here
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what is the difference between a compound microscope and a dissecting microscope? the light passes through the object you are observing in a compound microscope, whereas the light reflects off the object in a dissecting microscope
A compound microscope is used to magnify objects too small to be seen by the na.k.ed eye, while a dissecting microscope is used to magnify objects that are already visible to the na.k.ed eye, such as specimens of plants or animals.
Compound microscopes and dissecting microscopes differ from each other in several ways. The differences are summarized below:
Compound microscopes are used to examine specimens that are too small to be seen with the na.k.ed eye, while dissecting microscopes are used to examine specimens that are too large to be examined with a compound microscope. Compound microscopes use two lenses to magnify the image, while dissecting microscopes use multiple lenses to create a three-dimensional image. Compound microscopes have a high magnification power, while dissecting microscopes have a lower magnification power. Compound microscopes are used to examine transparent or thin specimens, while dissecting microscopes are used to examine opaque or thick specimens. Compound microscopes have a longer working distance, while dissecting microscopes have a shorter working distance. Compound microscopes are used to view living cells, while dissecting microscopes are used to view larger specimens such as insects or plant parts. Compound microscopes are used in biology, medicine, and chemistry, while dissecting microscopes are used in biology, geology, and materials science.Learn more about microscope at https://brainly.com/question/820911
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what enzyme moves along the template strand of dna synthesizing the mrna strand?
The enzyme that moves along the template strand of dna synthesizing the mRNA strand is RNA polymerases.
In molecular biology, an enzyme called RNA Polymerase, often known as RNA Pol or RNAP, synthesises RNA from a DNA template. With the aid of the enzyme helicase, which breaks down damaged DNA strands, RNA polymerase replicates the DNA sequence into an RNA sequence during the transcription process.
The RNA Pol participates in the identification of terminator areas, aids in the attachment and elongation of nucleotides, and not only transcribes DNA but also proofreads the transcribed RNA.
RNAP creates non-coding functional RNAs like tRNA, rRNA, and miRNA as well as functional mRNAs that code for proteins (translation). Prokaryotes, eukaryotes, and viruses all include the crucial enzyme RNA polymerase. Depending on the kind of organism, the RNAP complex might have different sizes and numbers of subunits.
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scientists hypothesize that over millions of years, the y chromosome has lost genes to the x chromosome. during what stages of meiosis might the y chromosome have transferred genes to the x chromosome? explain.
Scientists hypothesize that over millions of years, the Y chromosome has lost genes to the X chromosome. In meiosis, the X and Y chromosomes pair during the pachytene stage. As a result, DNA recombination occurs.
The non-homologous regions of the X and Y chromosomes are unpaired. As a result, the Y chromosome will act as a substrate for meiotic recombination. As a result, some genes are transferred from the Y chromosome to the X chromosome.
A mutation in the male-determining chromosome (the Y chromosome) will be passed on to subsequent generations without any opportunity for recombination, as males only have one copy of this chromosome.
As a result, the Y chromosome will be more susceptible to mutational deterioration than the X chromosome, which is more frequently recombined in both sexes. This is one of the reasons that the Y chromosome is used to track evolutionary relationships within species.
The X chromosome is also subject to mutation and recombination, but because females have two copies of this chromosome, it is not as susceptible to loss.
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as you lean your arm against the front edge of your desk, you are compressing vessels and thereby decreasing the diameter of those vessels. as this occurs, you should expect blood flow toward your hand to increase. (true or false)
It is FALSE as you lean your arm against the front edge of your desk, you are compressing vessels and thereby decreasing the diameter of those vessels. as this occurs, you should expect blood flow toward your hand to increase.
The passage of blood through the circulatory system is referred to as blood flow. The heart pumps blood through a network of blood vessels, including arteries, veins, and capillaries, to transport it throughout the body. Delivering nutrition and oxygen to tissues, eliminating waste, and controlling body temperature all depend on blood flow.
Vascular compression can cause blood flow to decrease because it reduces the diameter of the vessels. As a result, you should anticipate a drop in blood flow to your hand rather than an increase as you lean your arm against the front edge of your desk and compress the veins.
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10. Temperature differences between the equator and poles blank currents
Ocean currents are caused by temperature differences between the equator and the poles. A low-pressure area is produced when warm water close to the equator expands and rises.
As a result, the water starts to move in the direction of the poles, where it cools and solidifies. The circulation loop is closed when the denser water sinks and flows back in the direction of the equator.
TemperatureWherever on Earth, the temperature varies. From the equator to the poles, there is a temperature gradient, with warmer temperatures near the equator and colder ones near the poles. Ocean currents, which we refer to as the movement of ocean water, are caused by this temperature differential.The sun directly illuminates the Earth's surface at the equator, warming the water. As the heated water rises and expands, a low-pressure zone is formed. As a result, water starts to move in the direction of the poles, carrying heat with it. The water cools and gets denser as it travels away from the equator. This dense water sinks to the ocean floor and travels back toward the equator, completing the circulation cycle.learn more about Temperature here
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How would you explain the ""density of the elephant population"" to someone?
The number of elephants living in a certain location is referred to as the population density of elephants.
Elephant density is often measured in terms of how many live in a certain area, such as a square kilometer. Depending on the habitat, the availability of food, and other environmental conditions, the density of the elephant population can vary significantly.
Elephant populations may compete for resources in locations where there are many of them, which might result in confrontations with people and other animals. It is crucial to manage the elephant population's influence on the ecology and carry out conservation initiatives.
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what is the name for mammals who keep their young in pouches?
The name for mammals who keep their young in pouches is marsupials.
Marsupials are a group of mammals that give birth to relatively undeveloped young that complete their development in the mother's pouch. The young are born after a short gestation period of just a few weeks, which is followed by a long nursing period.
During this time, the young rely on the mother's milk for nutrition and are sheltered within her pouch, where they are kept warm and protected from predators.Marsupials are found mainly in Australia and the Americas. Some examples of marsupials include kangaroos, wallabies, koalas, opossums, and wombats.
The pouch varies in size and shape depending on the species and provides a protected environment where the young can grow and develop without being exposed to the dangers of the outside world.
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what pollutant that is put directly into the air by human activity
Answer: Carbon Dioxide (CO2) ????????
Explanation: Please paste the question for a better answer
what do researchers think is one cause of memory impairment related to growing older
One cause of memory impairment related to growing older, according to researchers is the decline in cognitive processing speed.
As we age, the rate at which we process information gradually slows down, resulting in difficulties with tasks that require us to process information quickly and accurately.
This cognitive slowing is thought to be related to changes in the brain that occur as we age, such as reduced brain volume and reduced connectivity between different regions of the brain. Additionally, factors such as stress, poor sleep, and certain medical conditions can also contribute to memory impairment.
To help maintain memory and cognitive function as we age, it is important to engage in activities that challenge the brain, such as learning new skills, reading, and engaging in social activities.
A healthy lifestyle, including a balanced diet, regular exercise, and good sleep habits, can also help support brain health and reduce the risk of cognitive decline.
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what type of sensory memory is categorized as auditory memory?
The type of sensory memory that is categorized as auditory memory is called echoic memory.
Echoic memory refers to the brief retention of auditory information that is heard for a few seconds after the sound has ended. This memory system allows the brain to process and make sense of sounds, such as speech or music, and to remember them briefly even after they are no longer present.
The duration of echoic memory can be up to 10 seconds, depending on the complexity of the auditory information and the level of attention paid to it. Echoic memory is a crucial component of language processing and is important for communication and comprehension.
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Similar to the mutation question about gastrin in class, if a mutation stops the ability for pepsinogen to respond to the presence of pepsin, what would happen to pepsin production:
A. Pepsin production would continue as usual
B. Total pepsin quantity would be determined by the amount of pepsinogen already present and stomach acid content
C. Pepsinogen would no longer be produced since it relies on mucus production
D. Gastrin would begin digesting proteins instead
If a mutation stops the ability for pepsinogen to respond to the presence of pepsin, the total pepsin quantity would be determined by the amount of pepsinogen already present and stomach acid content. Thus, the correct option will be B.
What is Pepsinogen?Since pepsinogen enzyme would no longer be activated in the presence of pepsin, pepsinogen would accumulate in the stomach. Pepsinogen would then be activated and converted to pepsin when the stomach is acidic due to the presence of hydrochloric acid (HCl) in the stomach.
A mutation that affects the production of pepsinogen, on the other hand, will decrease the production of pepsin since there would be less pepsinogen to convert to pepsin when the stomach is acidic.
The correct option is B, Total pepsin quantity would be determined by the amount of pepsinogen already present and stomach acid content.
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suppose all poaching could be stopped and no more elephants would be slaughtered for Tusk ivory. what would future populations of African forest elephants look like? would any elephants be Born tuskless? explain.
Comparing historical videos to contemporary footage revealed an increase from 19% to 51% in the percentage of female elephants lacking tusks, despite the population declining.
TuskThirty percent of females born after the war lack tusks.A pair of information chromosomes—XX for females and XY for males—determines the sex of mammals. The Princeton biologists hypothesized that the tuskless feature was connected to the X since tusks are almost universally present in male elephants. If the genes responsible for developing tusks are fatal when found on a male's single X chromosome, a female with two Xs may be saved provided they inherit one healthy copy of the gene. Such theory is supported by the tuskless trait's genetic inheritance pattern.For more information on elephant poaching kindly visit to
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precipitation that can carry pollutants into aquatic ecosystems
Precipitation that can carry pollutants into aquatic ecosystems is called runoff.
Aquatic ecosystems are ecological communities that exist within bodies of water such as oceans, lakes, rivers, and wetlands. They are complex systems that are shaped by a variety of physical, chemical, and biological factors. These factors include water temperature, dissolved oxygen levels, nutrient availability, water currents, and the interactions between different species of plants and animals.
Aquatic ecosystems can be divided into two main types: marine and freshwater. Marine ecosystems are found in saltwater bodies such as oceans and estuaries, while freshwater ecosystems exist in bodies of freshwater such as rivers, lakes, and wetlands. These ecosystems are home to a diverse range of aquatic plants and animals, including algae, plankton, fish, and mammals.
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What are mirror neurons, and how might they support observational learning?
An individual's brain activates mirror neurons, a particular type of brain cell, both when they carry out a particular action and when they see another person carrying out the same action.
What are mirror neurons?Mirror neurons are a type of brain cell that are activated both when an individual performs a specific action and when they observe another individual performing the same action. They were first discovered in macaque monkeys by Italian neuroscientist Giacomo Rizzolatti and his team in the 1990s.
Mirror neurons are found in several areas of the brain, including the premotor cortex, inferior parietal lobule, and superior temporal sulcus. They play a role in understanding the actions and intentions of others, as well as in the development of empathy and social cognition.
Research suggests that mirror neurons may be involved in a range of functions, from imitating the behavior of others to language acquisition, and even in the development of certain disorders such as autism.
Overall, mirror neurons provide insight into the neural mechanisms underlying social behavior, and continue to be an active area of research in neuroscience.
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According to the cellular clock theory what causes aging?
This idea contends that ageing is the result of cells reaching their preset reproductive limit because many human cells do not continue to proliferate indefinitely.
Cells simply lose some of their component parts throughout time. Telomeres, the caps on cell chromosomes, are one instance of this.
The genetic material, or chromosomes, gradually loses its protective cover with each cell division until the cell is no longer able to divide.
According to the Cellular Clock Hypothesis, normal cells can only divide for a finite amount of time. A DNA region known as a telomere, which is found at the end of each chromosomal strand but does not code for any specific protein, guards the remaining chromosomes. The length of the telomere decreases with each replication.
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2.
PART B: Which TWO sentences from the article best support the answers to Part A?
"Fingerprints probably represent the best-known example of a feature
useful in biometrics." (Paragraph 5)
A.
B.
C.
D.
E.
F.
"Any feature of the body with a unique shape, size, texture or pattern ...
potentially can be used to identify someone." (Paragraph 5)
"It can be hard to get a good print from people who have worn down the
skin on their fingers after years of working with rough materials, such as
brick or stone." (Paragraph 32)
"Health officials tap into this file, using the fingerprint scanner, to
accurately identify which children still need vaccinating..." (Paragraph 40)
"Using biometrics to keep kids healthy, log onto electronic devices and
catch criminals are important applications." (Paragraph 42)
"We eventually want to use facial recognition in robots that can identify
who you are." (Paragraph 44)
Answer:
The best two sentences that support the answers to Part A are:
"Any feature of the body with a unique shape, size, texture or pattern potentially can be used to identify someone." (Paragraph 5)
This sentence supports the answer to Part A because it indicates that any unique feature of the body can be used for biometric identification, including features like the pattern of veins in the hand.
"It can be hard to get a good print from people who have worn down the skin on their fingers after years of working with rough materials, such as brick or stone." (Paragraph 32)
This sentence supports the answer to Part A because it explains that people who have worked with rough materials for many years may have worn down their fingerprints, making it more difficult to use fingerprints for biometric identification.
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