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
Answer:A
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