________ is an enzyme that may have evolved from ancient progenitor cells with an RNA genome, and it functions as a ________.
A) Primase; helicase
B) Primase; reverse transcriptase
C) Telomerase; helicase
D) Telomerase; reverse transcriptase
E) Telomerase; methylator and acetylator

Question

Quizplus · Accepted Answer

Telomerase is an enzyme that extends telomeres, which are the protective caps at the ends of chromosomes. Evidence suggests that telomerase evolved from ancient progenitor cells with an RNA genome and functions as a reverse transcriptase, which copies RNA into DNA. This allowed the RNA genome to become integrated into the host genome, eventually leading to the evolution of DNA-based life forms.

________ Is an Enzyme That May Have Evolved from Ancient