Cell Biology Chapter 15
We are deep into our studies on all there is to learn about the topic of cells – under the overlying umbrella that is the scientific topic of biology – but we’re not done quite yet. Take a look at chapter 15 and see if you really know your stuff, or if you need to study that little bit harder.
Questions and Answers
- 1.
highly compacted radial loops remain anchored to a scaffold formed from proteins in the nuclear matrixWhat type of Chromosome?
- A.
Anaphase
- B.
Metaphase
- C.
Telophase
- D.
Prophase
- E.
Interphase
Correct Answer
B. MetapHaseExplanation
During metaphase, the highly compacted radial loops of chromosomes remain anchored to a scaffold formed from proteins in the nuclear matrix. This scaffold helps to organize and stabilize the chromosomes, ensuring that they are properly aligned at the center of the cell before they are separated during anaphase. Therefore, the given correct answer for the type of chromosome is Metaphase.Rate this question:
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- 2.
Highly compacted and transcriptionally inactive – Some localized regions in nondividing cells
- A.
Heterochromatin
- B.
Euchromatin
Correct Answer
A. HeterochromatinExplanation
Heterochromatin refers to regions of DNA that are highly compacted and transcriptionally inactive. These regions are typically found in nondividing cells. In contrast, euchromatin refers to regions of DNA that are less compacted and transcriptionally active. Therefore, the correct answer is heterochromatin.Rate this question:
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- 3.
– Less condensed and capable of gene transcription – Most chromosomal regions in nondividing cells
- A.
Heterochromatin
- B.
Euchromatin
Correct Answer
B. EuchromatinExplanation
Euchromatin is the correct answer because it is less condensed and capable of gene transcription. In contrast to heterochromatin, euchromatin is found in most chromosomal regions in nondividing cells. Euchromatin is more accessible to transcription factors and other molecules involved in gene expression, allowing for active transcription of genes.Rate this question:
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- 4.
Most transcriptional activities _____ during cell division.
- A.
Begin
- B.
Cease
- C.
Pause
- D.
Elongate
Correct Answer
B. CeaseExplanation
During cell division, most transcriptional activities cease. This is because the cell needs to focus on replicating its DNA and dividing into two daughter cells. Transcription, which is the process of synthesizing RNA from DNA, is temporarily halted to ensure accurate DNA replication and proper cell division. Once cell division is complete, transcription can resume and gene expression can continue as normal.Rate this question:
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- 5.
Where can acetylation, methylation, and phosphorylation be found?
- A.
DNA backbone
- B.
RNA
- C.
Chromosome
- D.
Amino terminal tail
Correct Answer
D. Amino terminal tailExplanation
Acetylation, methylation, and phosphorylation are post-translational modifications that occur on proteins. These modifications can regulate protein function and cellular processes. The amino terminal tail refers to the N-terminus of a protein, which is the end that contains the amino group. It is known that acetylation, methylation, and phosphorylation can occur on the amino terminal tail of proteins, suggesting that these modifications can be found in this region. Therefore, the correct answer is the amino terminal tail.Rate this question:
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- 6.
For a diploid human cell, 2 complete sets of chromosomes from a single cell constitute a ________ of that cell.
Correct Answer
karyotypeExplanation
A karyotype refers to the complete set of chromosomes present in an individual's cells. In a diploid human cell, there are two complete sets of chromosomes, one set inherited from each parent. Therefore, the term "karyotype" accurately describes the collection of chromosomes in a diploid human cell.Rate this question:
- 7.
Protein synthesis for M phase happens in which of the following phases?
- A.
G1
- B.
S
- C.
G2
Correct Answer
C. G2Explanation
During the G2 phase of the cell cycle, protein synthesis for M phase occurs. This is the phase where the cell prepares for mitosis by replicating its DNA and synthesizing proteins necessary for cell division. G1 phase is the phase where the cell grows and carries out its normal functions, while the S phase is the phase where DNA replication takes place. Therefore, neither G1 nor S phase is the correct answer for protein synthesis for M phase.Rate this question:
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- 8.
What type of cell division has the following: A cell divides to produce 2 new cells genetically identical to the original • Original called mother, new cells called daughters • Involves mitosis and cytokinesis • Can be for asexual reproduction or for production and maintenance of multicellularity
Correct Answer
mitotic cell division
mitoticExplanation
Mitotic cell division is the correct answer because it involves the process of mitosis and cytokinesis, where a cell divides to produce two new cells that are genetically identical to the original cell. The original cell is called the mother cell, while the new cells are called daughter cells. This type of cell division can occur for asexual reproduction, where an organism can reproduce without the need for a partner, or for the production and maintenance of multicellularity, where cells divide to form tissues, organs, and organisms.Rate this question:
- 9.
What is responsible for organizing and sorting the chromosomes during mitosis?
Correct Answer
mitotic spindle
mitotic spindle apparatusExplanation
The mitotic spindle, also known as the mitotic spindle apparatus, is responsible for organizing and sorting the chromosomes during mitosis. It is a complex structure made up of microtubules that form a spindle-shaped framework. The spindle fibers attach to the centromeres of the chromosomes and help to separate them into two daughter cells during cell division. This process ensures that each daughter cell receives the correct number and type of chromosomes.Rate this question:
- 10.
Two sucessive cell divisions but only one DNA duplication resulting in what? 2 answers
Correct Answer
Meiosis and 4 haploid cells
Meiosis and four haploid cells
Meiosis and 4 haploid cell
Meiosis and four haploid cell
Meiosis 4 haploid cells - 11.
Correct Answer
crossing over - 12.
- A.
Interphase
- B.
Prophase
- C.
ProMetaphase
- D.
Metaphase
- E.
Anaphase
Correct Answer
A. InterpHase -
- 13.
- A.
Interphase
- B.
Prophase
- C.
ProMetaphase
- D.
Metaphase
- E.
Anaphase
Correct Answer
B. PropHase -
- 14.
- A.
Prophase
- B.
Prometaphase
- C.
Metaphase
- D.
Anaphase
- E.
Telophase and Cytokinesis
Correct Answer
B. PrometapHase -
- 15.
- A.
Prophase
- B.
Metaphase
- C.
Anaphase
- D.
Telophase
Correct Answer
B. MetapHase -
- 16.
- A.
Prophase
- B.
Metaphase
- C.
Anaphase
- D.
Telophase and Cytokinesis
Correct Answer
C. AnapHase -
- 17.
- A.
Prophase
- B.
Metaphase
- C.
Anaphase
- D.
Telophase and Cytokinesis
Correct Answer
D. TelopHase and Cytokinesis -
- 18.
Which stage of Meiosis does crossing over occur and the cell divides but does not split the chromosomes?
- A.
Meiosis I
- B.
Meiosis II
- C.
Mitosis
Correct Answer
A. Meiosis IExplanation
Crossing over occurs during the stage of Meiosis I. This is the stage where homologous chromosomes pair up and exchange genetic material, resulting in genetic recombination. During Meiosis I, the cell undergoes two rounds of division, but the chromosomes do not split completely. This is in contrast to Meiosis II, where the cell divides again, resulting in the separation of sister chromatids. Mitosis, on the other hand, is a different process altogether, where a cell divides to produce two identical daughter cells.Rate this question:
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- 19.
What occurs in cells within the testes or ovaries to produce gametes?
Correct Answer
meiosisExplanation
In cells within the testes or ovaries, meiosis occurs to produce gametes. Meiosis is a specialized type of cell division that results in the formation of haploid cells, which are the gametes. During meiosis, the cells undergo two rounds of division, resulting in the production of four genetically different haploid cells. This process is crucial for sexual reproduction as it ensures that the offspring receive a unique combination of genetic material from both parents.Rate this question:
- 20.
When a sperm and egg unite what do they form?
Correct Answer
zygote
a zygoteExplanation
When a sperm and egg unite, they form a zygote. A zygote is the initial cell formed after fertilization, which contains the genetic material from both the sperm and egg. This single-celled organism will undergo cell division and development to eventually form a complete organism.Rate this question:
- 21.
In animals which is dominant diploid or haploid?
Correct Answer
diploidExplanation
In animals, the dominant form is diploid. This means that the cells of animals typically have two sets of chromosomes, one inherited from each parent. This allows for genetic diversity and the ability to produce offspring through sexual reproduction. Haploid organisms, on the other hand, have only one set of chromosomes and are typically found in certain stages of the reproductive cycle, such as eggs and sperm.Rate this question:
- 22.
In fungi which is dominant diploid or haploid?
Correct Answer
haploidExplanation
Fungi are predominantly haploid, meaning they have only one set of chromosomes. This is because their life cycle involves a dominant haploid phase, where most of their growth and reproduction occurs. During this phase, haploid cells undergo mitosis to produce more haploid cells. The diploid phase, where two sets of chromosomes are present, is usually short-lived and occurs during sexual reproduction when haploid cells fuse to form a diploid zygote. However, the haploid phase remains dominant throughout the fungal life cycle.Rate this question:
- 23.
In plants which is dominant diploid or haploid?
Correct Answer
neither
both
alterationExplanation
The correct answer is "neither, both, alteration." This is because in plants, the dominance of diploid or haploid forms can vary depending on the specific stage of the plant's life cycle. During different phases, plants can exhibit both diploid and haploid dominance, or they can undergo alternation between the two forms. Therefore, neither diploid nor haploid is consistently dominant in plants.Rate this question:
- 24.
What is The characterization of the chromosomal complement of an individual or a species, including number, form, and size of the chromosomes?
Correct Answer
karyotypeExplanation
The term "karyotype" refers to the characterization of the chromosomal complement of an individual or a species, which includes information about the number, form, and size of the chromosomes. It is a visual representation or description of the chromosomes in a cell. Karyotyping is commonly used in genetic testing and research to identify chromosomal abnormalities or to determine an individual's sex.Rate this question:
- 25.
Chemical dye gives a distinctive ______ pattern.
Correct Answer
banding
bandExplanation
Chemical dye gives a distinctive pattern known as banding. This pattern is characterized by the presence of bands or stripes of different colors or shades. The term "banding" refers to the visible bands that are formed when the dye is applied or reacts with a material, such as fabric or paper. These bands can be seen as a result of the dye molecules binding to specific areas or regions, creating a unique and recognizable pattern. The term "band" is also used to describe these individual stripes or bands that make up the overall pattern.Rate this question:
- 26.
Name in order
- A.
Metacentric, Acrocentric, Submetacentric, Telocentric
- B.
Telocentric, Metacentric, Submetacentric, Acrocentric
- C.
Submetacentric, Metacentric, Acrocentric, Telocentric
- D.
Metacentric, Submetacentric, Acrocentric, Telocentric
Correct Answer
D. Metacentric, Submetacentric, Acrocentric, TelocentricExplanation
The order of the names in the answer corresponds to the order of the types of chromosomes based on their centromere position. Metacentric chromosomes have the centromere located in the middle, Submetacentric chromosomes have the centromere located slightly off-center, Acrocentric chromosomes have the centromere located near one end, and Telocentric chromosomes have the centromere located at the very end. Therefore, the correct order is Metacentric, Submetacentric, Acrocentric, Telocentric.Rate this question:
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- 27.
True of False: Polyploidy is an excessive amount of chromosome composition and Aneuploidy is a less amount of chromosome composition.
Correct Answer
TrueExplanation
Polyploidy refers to the condition where an organism has more than two complete sets of chromosomes. This means that there is an excessive amount of chromosome composition. On the other hand, aneuploidy refers to the condition where an organism has an abnormal number of chromosomes, which can be either more or less than the usual diploid number. Therefore, it can be concluded that polyploidy is an excessive amount of chromosome composition, while aneuploidy is an abnormal or less amount of chromosome composition.Rate this question:
- 28.
What is it called when homologues fail to separate?
Correct Answer
NondisjunctionExplanation
Nondisjunction refers to the failure of homologous chromosomes to separate during cell division, resulting in an abnormal distribution of chromosomes in the daughter cells. This can occur during both meiosis and mitosis and can lead to genetic disorders or abnormalities.Rate this question:
- 29.
Removes a segment of chromosome is called what?
Correct Answer
DeficiencyExplanation
Deficiency refers to the removal of a segment of a chromosome. This process can result in the loss of specific genes or genetic material, leading to various genetic disorders or abnormalities.Rate this question:
- 30.
For Trisonomy 21 which of the following is incorrect?
- A.
1/800 live births
- B.
Down syndrome
- C.
Flattened Face
- D.
Tall
- E.
Mental retardation
Correct Answer
D. TallExplanation
Tall is the incorrect option for Trisomy 21. Trisomy 21, also known as Down syndrome, is a genetic disorder that occurs in approximately 1 in 800 live births. It is characterized by physical features such as a flattened face, mental retardation, and various health issues. However, individuals with Down syndrome typically have shorter stature rather than being tall.Rate this question:
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- 31.
Which of the following is true of Trisonomy 18?
- A.
Edward, 1/6000, Mental and physical, extreme muscle tone, early death
- B.
Edward, 1/800, Mental and physical, extreme muscle tone, early death
- C.
Down, 1/6000, Mental and physical, extreme muscle tone, early death
- D.
Patau, 1/15000, Mental and physical, extreme muscle tone, early death
Correct Answer
A. Edward, 1/6000, Mental and pHysical, extreme muscle tone, early deathExplanation
Trisomy 18, also known as Edward syndrome, is a genetic disorder characterized by the presence of an extra copy of chromosome 18. It occurs in approximately 1 in 6,000 live births. Individuals with Trisomy 18 experience both mental and physical developmental delays, along with extreme muscle tone abnormalities. Sadly, the condition often leads to early death, with many affected individuals not surviving beyond their first year of life. The given answer accurately describes Trisomy 18, making it the correct choice.Rate this question:
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- 32.
Trisonomy 13, which of the following is true?
- A.
Edward, 1/6000, mental and physical, early death, extreme muscle tone
- B.
Down, 1/800, mental, short, flattened face
- C.
Patau, 1/15000, mental and physical, early death, defects in organs
- D.
Patau 1/6000, mental and physical, early death, flattened face
Correct Answer
C. Patau, 1/15000, mental and pHysical, early death, defects in organsExplanation
Trisomy 13, also known as Patau syndrome, is a genetic disorder characterized by the presence of an extra copy of chromosome 13. The given answer correctly states that Patau syndrome occurs in approximately 1 in 15,000 births. Individuals with Patau syndrome experience both mental and physical abnormalities, which can include intellectual disabilities, developmental delays, and physical malformations. Early death is also common, with many affected individuals not surviving past infancy. Additionally, Patau syndrome often presents with defects in various organs, such as the heart, brain, and kidneys.Rate this question:
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- 33.
1/1000(males)KlinefelterNo spermBreast swelling
- A.
X
- B.
XXX
- C.
XXY
- D.
XYY
Correct Answer
C. XXYExplanation
XXY is the correct answer because Klinefelter syndrome is a genetic disorder that occurs in males and is characterized by the presence of an extra X chromosome. This results in a total of 47 chromosomes instead of the usual 46. Individuals with XXY have reduced fertility and may experience symptoms such as breast swelling. The other options (XXX, X, and XYY) do not match the characteristics of Klinefelter syndrome.Rate this question:
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- 34.
1/1000 malesTallJacobs
- A.
X
- B.
XYY
- C.
XXX
- D.
XXY
Correct Answer
B. XYYExplanation
The given answer XYY is correct because it represents a chromosomal abnormality in males where they have an extra Y chromosome. This condition is known as XYY syndrome and it occurs in approximately 1 in 1000 males. Individuals with XYY syndrome may be taller than average and can have certain behavioral and developmental differences, although the effects can vary widely among individuals. The other options (XXX and XXY) do not accurately represent this specific chromosomal abnormality.Rate this question:
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- 35.
1/1500 femalesTriple XTall and ThinMenstrual irregularity
- A.
XXX
- B.
X
- C.
XYY
- D.
XXY
Correct Answer
A. XXXExplanation
The correct answer is XXX because it represents a condition called Triple X Syndrome, which occurs when a female has an extra X chromosome in each of her cells. This genetic condition can cause tall stature and thin body build, as well as menstrual irregularities. The other options (X, XYY, XXY) represent different chromosomal abnormalities but do not match the specific characteristics mentioned in the question.Rate this question:
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- 36.
Turner1/5000 femalesshortwebbed neck
- A.
X
- B.
XYY
- C.
XXX
- D.
XXY
Correct Answer
A. XExplanation
The given answer is "X". This suggests that the individual has two X chromosomes, indicating that they are female. The presence of only two X chromosomes also suggests that they do not have any additional chromosomes, such as XYY, XXX, or XXY. The mention of "Turner" and "short webbed neck" in the question may imply that the individual has Turner syndrome, a genetic condition that affects females and is characterized by the absence or partial absence of one X chromosome.Rate this question:
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- 37.
What does Duplication do?
Correct Answer
Doubles a particular region
doubles
duplicates a particular regionExplanation
Duplication refers to the act of creating an identical copy of something. In the context of the question, it specifically relates to doubling or creating a duplicate of a particular region. This means that the region is replicated, resulting in two identical versions of it. Therefore, the correct answer is that duplication doubles or duplicates a particular region.Rate this question:
- 38.
What flips a region to the opposite orientation?
Correct Answer
InversionExplanation
Inversion is the process that flips a region to the opposite orientation. In genetics, inversion refers to a type of chromosomal rearrangement where a segment of DNA is reversed within the chromosome. This inversion can lead to changes in gene expression and disrupt normal genetic processes. Therefore, inversion is the correct answer to the question.Rate this question:
- 39.
What moves a segment of one chromosome to a different chromosome?
Correct Answer
Simple translocationExplanation
Simple translocation is a type of chromosomal rearrangement where a segment of one chromosome breaks off and attaches to a different chromosome. This can occur when there is an error during DNA replication or repair. The movement of the segment to a different chromosome can lead to changes in the genetic material, potentially affecting the expression of genes and causing genetic disorders.Rate this question:
- 40.
The exchange of pieces between 2 different chromosomes is called what?
Correct Answer
reciprocal translocationExplanation
Reciprocal translocation refers to the exchange of genetic material between two non-homologous chromosomes. It occurs when two chromosomes break and the broken segments are exchanged, resulting in a rearrangement of genetic material. This process can lead to genetic disorders or abnormalities, as it may disrupt the normal functioning of genes. Therefore, the correct answer to the question is reciprocal translocation.Rate this question:
- 41.
What promotes cell division in plants?
Correct Answer
cytokinins
cytokininExplanation
Cytokinins are a type of plant hormone that promotes cell division in plants. They stimulate the growth of lateral buds and promote the division of cells in the root and shoot meristems. Cytokinins also play a role in regulating various physiological processes in plants, such as leaf senescence and nutrient uptake. Overall, cytokinins are essential for the growth and development of plants by promoting cell division and maintaining the balance between cell proliferation and differentiation.Rate this question:
- 42.
What stimulates certain cells to grow in animals?
Correct Answer
Growth factors
growth factorExplanation
Growth factors are responsible for stimulating certain cells to grow in animals. These are proteins that bind to specific receptors on the surface of cells, triggering a cascade of signals that ultimately lead to cell division and growth. By binding to these receptors, growth factors regulate cell proliferation, differentiation, and survival. They play a crucial role in various physiological processes, including embryonic development, tissue repair, and immune response. Overall, growth factors are essential for the growth and development of cells in animals.Rate this question:
- 43.
The two cell cycle controls are _______ and _______.
Correct Answer
cyclins and cyclin-dependent kinasesExplanation
The two cell cycle controls are cyclins and cyclin-dependent kinases. Cyclins are proteins that regulate the progression of the cell cycle by binding to and activating cyclin-dependent kinases (CDKs). CDKs are enzymes that control the cell cycle by phosphorylating target proteins, which in turn regulate various cell cycle events such as DNA replication and cell division. Together, cyclins and cyclin-dependent kinases play a crucial role in ensuring the orderly progression of the cell cycle.Rate this question:
- 44.
What are : protein kinases that control cell cycle –active only when bound to cyclins
Correct Answer
cdk
cyclin-dependent kinases
cyclin dependent kinaseExplanation
Protein kinases are enzymes that regulate various cellular processes, including the cell cycle. They become active when they bind to cyclins, which are regulatory proteins. Cyclin-dependent kinases (CDKs) are a group of protein kinases that control the progression of the cell cycle. They are called "cyclin-dependent" because their activity is dependent on the presence of cyclins. Cyclin-dependent kinase is another term used to refer to these kinases. Therefore, the correct answer includes all three terms: cdk, cyclin-dependent kinases, and cyclin dependent kinase.Rate this question:
- 45.
What are : regulatory proteins levels fluctuate during cell cycle
Correct Answer
cyclins
cyclinExplanation
Cyclins are regulatory proteins that control the progression of the cell cycle. These proteins are present in varying levels throughout the cell cycle, with their levels fluctuating at different stages. Cyclins bind to and activate cyclin-dependent kinases (CDKs), which are enzymes responsible for driving the cell cycle forward. By regulating the activity of CDKs, cyclins play a crucial role in coordinating the events of the cell cycle, ensuring that each stage is completed before moving on to the next. Therefore, the statement that "cyclins" and "cyclin" are regulatory proteins whose levels fluctuate during the cell cycle is correct.Rate this question:
- 46.
Which checkpoint determines if conditions are favorable for division?
- A.
G1
- B.
S
- C.
G2
- D.
M
Correct Answer
A. G1Explanation
G1 is the checkpoint that determines if conditions are favorable for division. During the G1 phase of the cell cycle, the cell checks for various factors such as the availability of nutrients, growth factors, and DNA damage. If all these conditions are favorable, the cell proceeds to the S phase for DNA replication and division. If any of these conditions are not met, the cell may enter a resting state called the G0 phase or undergo cell death. Therefore, G1 acts as a crucial checkpoint to ensure that the cell is ready and conditions are favorable for division.Rate this question:
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- 47.
Which checkpoint determines DNA replication errors/damage and proteins for M phase?
- A.
G1
- B.
S
- C.
G2
- D.
M
Correct Answer
C. G2Explanation
G2 is the checkpoint that determines DNA replication errors/damage and proteins for M phase. During G2, the cell checks for any mistakes or damage in the replicated DNA before entering the M phase. If any errors or damage are detected, the cell will attempt to repair them before proceeding to the next phase. This checkpoint ensures that the cell has accurately replicated its DNA and is ready for cell division.Rate this question:
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- 48.
Which checpoint determines the chromosomal sorting on spindle apparatus?
- A.
G1
- B.
S
- C.
G2
- D.
M
Correct Answer
D. MExplanation
The checkpoint that determines the chromosomal sorting on the spindle apparatus is the M checkpoint. This checkpoint occurs during the metaphase stage of mitosis and ensures that all chromosomes are properly aligned and attached to the spindle fibers before they are separated and pulled to opposite ends of the cell during anaphase. This checkpoint is crucial for maintaining the correct number and distribution of chromosomes in the daughter cells.Rate this question:
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- 49.
The loss of ______ _______ can lead to mutation and cancer
Correct Answer
checkpoint functionExplanation
Checkpoint function refers to the process in which cells regulate and monitor their own DNA replication and repair. It ensures that DNA damage is repaired before the cell progresses to the next stage of the cell cycle. The loss of checkpoint function can lead to the accumulation of DNA mutations, as damaged DNA may go unrepaired, increasing the risk of developing cancer.Rate this question:
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