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.
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Which of the following is not considered a monophyletic group? (Select all correct answer options.)
A. angiosperms B. angiosperms and gymnosperms C. mosses, liverworts, and hornworts D. lycophytes and ferns/horsetails E. lycophytes, ferns/horsetails, angiosperms, and gymnosperms
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
Individuals from different subspecies usually interbreed where their geographic distributions meet
a. True b. False
How many "turns" are present in crambin?
a. 1 b. 2 c. 3 d. 4