The three-domain system is primarily based on
A) molecular data showing eukaryotes are much more closely related than previously thought.
B) structural data showing eukaryotes are far more diverse than previously thought.
C) molecular data showing prokaryotes are far more diverse than previously thought.
D) new biogeographical data showing prokaryotes are far more diverse than previously thought.
E) new classification concepts that have shown everything except molecular data to be irrelevant.

Question

Quizplus · Accepted Answer

The three-domain system is primarily based on molecular data showing prokaryotes are far more diverse than previously thought. This system recognizes the fundamental division between archaea and bacteria, based on their unique molecular and genetic characteristics. The Eukarya are placed in a separate domain due to their distinct membrane-bound nucleus and other cell structures. The system was proposed by Carl Woese in 1977 based on his studies of ribosomal RNA sequencing.

The Three-Domain System Is Primarily Based on