Researchers have extended the life of a human cell by
A) removing the caps of DNA molecules.
B) injecting it with telomerase.
C) rearranging the DNA sequences.
D) splicing the 18th and 19th chromosomes.

Question

Quizplus · Accepted Answer

The enzyme telomerase adds DNA sequence repeats to the end of chromosomes, known as telomeres, which act as protective caps. Without telomerase, cells eventually lose their telomeres and stop dividing. Injecting a human cell with telomerase can extend its lifespan.

Researchers Have Extended the Life of a Human Cell by