What happens to chromosomes in cells in which the telomerase gene is not expressed or is mutated?

What will be an ideal response?


Ans: The loss of telomerase activity results in the shortening of chromosomal ends with each cell division, since the removal of RNA replication primers from chromosomal ends leaves single-stranded regions that are subsequently degraded. The gradual shortening of chromosome ends eventually leads to chromosome breaks and increased rates of translocation and mutation.

Biology & Microbiology

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Which of the following is not considered a monophyletic group? (Select all correct answer options.)

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During transformation, cells ____

a. take up pieces of DNA that are released as other cells disintegrate b. take up pieces of DNA through a viral infection c. replicate DNA molecules d. make replicate copies of one another e. generate their own DNA

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Individuals from different subspecies usually interbreed where their geographic distributions meet

a. True b. False

Biology & Microbiology

How many "turns" are present in crambin?

a. 1 b. 2 c. 3 d. 4

Biology & Microbiology