The same DNA code is used by Archaea, Bacteria, and Eukarya.However, when the sequences of genes encoding proteins of similar function are compared, certain groups of genes in Eukarya are more similar to those in Archaea than to those in Bacteria, while other groups of genes in Eukarya are more similar to those in Bacteria than to those in Archaea.Which statement is consistent with these findings?
A) The origins of Archaea, Bacteria, and Eukarya are all different and unique from one another.
B) Archaea and Bacteria have the same common ancestor that differs from the one each shares with Eukarya.
C) Eukarya and Bacteria have the same common ancestor, and Eukarya and Archaea have the same common ancestor, but Archaea and Bacteria do not share a common ancestor.
D) Archaea, Bacteria, and Eukarya represent lineages that came from a single common ancestor.
E) Eukarya and Archaea have the same common ancestor that differs from the one each shares with Bacteria.

Question

Quizplus · Accepted Answer

The observation that some eukaryotic genes are more similar to archaeal genes while others are more similar to bacterial genes suggests that all three domains of life (Archaea, Bacteria, and Eukarya) share a single common ancestor. This common ancestry is consistent with the concept of a universal common ancestor from which all life diverged.

The Same DNA Code Is Used by Archaea, Bacteria, and Eukarya.However