Scelta multipla
Which enzyme reduces the likelihood of DNA loss from telomeres during replication?
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14. DNA Synthesis
Telomeres
Scelta multipla
Telomere shortening puts a limit on the number of times a cell can divide. Research has shown that telomerase can extend the life span human cells. How might adding telomerase affect cellular aging?
A
Telomerase will speed up the rate of cell division.
B
Telomerase stops telomere shortening and slows or stops cellular aging.
C
Telomerase shortens telomeres, which slows or stops cellular aging.
D
Telomerase would have no effect on cellular aging.
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Understand the role of telomeres: Telomeres are repetitive nucleotide sequences at the ends of chromosomes that protect them from deterioration. Each time a cell divides, telomeres shorten, eventually leading to cellular aging and senescence when they become too short.
Learn about telomerase: Telomerase is an enzyme that adds nucleotide sequences to the ends of telomeres, effectively lengthening them and counteracting the shortening that occurs during cell division.
Consider the effect of telomerase on cellular aging: By preventing telomere shortening, telomerase can maintain the integrity of chromosomes, allowing cells to continue dividing beyond their normal limit, which can slow or stop the process of cellular aging.
Evaluate the statement: 'Telomerase will speed up the rate of cell division.' This is incorrect because telomerase does not directly affect the rate of cell division; rather, it extends the potential number of divisions by maintaining telomere length.
Conclude with the correct understanding: Adding telomerase to cells can stop telomere shortening, thereby slowing or stopping cellular aging, as it allows cells to divide more times than they normally would without telomerase.
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