The Small Ribosomal RRNA Gene Sequences of Hyperthermophilic Archaea and Bacteria

The small ribosomal rRNA gene sequences of hyperthermophilic Archaea and Bacteria have relatively high GC content, which

A) increased stability at high temperatures because GC pairs are joined by 3 hydrogen bonds.
B) decreased stability at high temperatures because GC pairs are joined by 2 hydrogen bonds.
C) increased mutation rates at high temperatures compared with other rRNA.
D) considerable variation in their GC content, making this unhelpful as a distinguishing feature between them and non-hyperthermophilic Archaea and Bacteria.