The RRNA Gene Sequences of Hyperthermophilic Archaea and Bacteria Have

Multiple Choice

The rRNA gene sequences of hyperthermophilic Archaea and Bacteria have diverged ________ over time,likely due to ________.

A) relatively little / strong constraints on sequence changes at higher temperatures
B) substantially / higher mutation rates at higher temperatures
C) relatively little / low mutation rates in these ancient organisms
D) substantially / DNA damage at higher temperatures