Which of the following is the best evidence for a three-domain system?
A) There are three distinctly different Gram reactions.
B) There are three distinctly different sets of metabolic reactions.
C) Nucleotide sequences in ribosomal RNA vary between all three domains.
D) Some bacteria live in extreme environments.
E) There are three distinctly different types of nuclei.

Question

Quizplus · Accepted Answer

The three-domain system is based on differences in the nucleotide sequences of ribosomal RNA, which reflect evolutionary relationships among the domains.

Which of the Following Is the Best Evidence for a Three-Domain