Telomeres are nucleotide sequences at the ends of DNA molecules of eukaryotic cells. Since linear chromosomal DNA gets shortened naturally after each round of replication, telomeres protect the genes near the ends of DNA from being eroded. An enzyme, telomerase, catalyses the lengthening of telomeres. In which of the following cells do you expect the activity of telomerase to be the highest?

• A

  Differentiated cells.
• Correct answer
  B

  Stem cells.
• C

  Actively respiring cells.
• D

  Aging cells.

Hence, the correct answer is option: 'B'.