The Placement of an Organism into a Domain is Made

Question

The placement of an organism into a domain is made on the basis of
A) G + C content.
B) cell ultrastructure.
C) ribosomal RNA analysis.
D) serological tests.
E) Gram-stain reactions.

Accepted Answer

The placement of an organism into a domain is best made on the basis of ribosomal RNA analysis. This is due to the fact that ribosomal RNA is highly conserved across all domains of life, allowing for comparisons between organisms from different kingdoms. This method is also highly accurate and is considered to be the gold standard for determining evolutionary relationships between organisms.