The Number of Prokaryote Species That Have Been Identified Is

The number of prokaryote species that have been identified is about _______. The total number of prokaryote species is likely to be at least _______. This estimate is based on the analysis of at least _______ sequences of random samples from the environment.

A) 5,000; millions; mitochondrial DNA
B) 10,000; 500,000; genomic DNA
C) 10,000; millions; ribosomal RNA gene
D) 5,000; 500,000; ribosomal RNA gene
E) 5,000; 1 million; ribosomal RNA gene