Dolly's Lifespan Might Have Been Extended by Giving Her Supplementary

Question

Dolly's lifespan might have been extended by giving her supplementary ___.  
A) Telomeres
B) Thymine, adenine, and guanine nucleotides
C) Growth hormone
D) Telomerase
E) Cytokines

Accepted Answer

Telomerase is an enzyme that adds telomeres to the ends of chromosomes. Telomeres are protective caps that shorten as cells divide, eventually leading to aging and cell death. By supplementing Dolly with telomerase, her telomeres could have been extended, potentially increasing her lifespan.