Question

Which of the following provides the strongest justification for the decision to separate the Archaea and Bacteria into two different domains?

A. Archaea have very ancient forms of DNA while those found in bacteria are more recently evolved
B.Archaeas keep their DNA in a nucleoid while bacteria allow their DNA to float to the center of the cell
C. Archaea form endosorespores for protection from harsh environments while bacteria produce flagella instead
D.Archaea do not form their cell wall from peptidoglycan while bacteria do

Answer 1

D) Archaea do not form their cell wall from peptidoglycan while Bacteria do.

Explanation: I got it correct on the pre-test.

Answer 2

Microorganisms are divided into prokaryotes and eukaryotes. Under prokaryotes are the bacteria and archaea. Before, they were taken as one (called archaebacteria). However, they were classified into two domains because of significant differences. These differences are:

Archaea have 3 RNAs while bacteria only has one. Cell membranes of archaea are made of ether bonds, while bacteria are made of ester bonds. Also, bacteria's cell walls contain peptidoglycans while archaea do not have.

Thus, the answer is letter D.