Question

The most significant difference between archaea and bacteria is the:

	lack of a nuclear envelope in archaea.
	absence of the 70S ribosomes in bacteria.
	presence of a single filament flagellum in bacteria.
	absence of peptidoglycans in the cell walls of archaea.
	presence of fatty acids in the plasma membranes of archaea.

Answer 1

The most significant difference between archaea and bacteria is the absence of peptidoglycans in the cell walls of archaea.

Bacterial cell wall has peptidoglycan while archaea cell wall contains polysaccharides and proteins.

Other options are wrong.

Both bacteria and archaea do not have nuclear envelope.

Bacterial ribosome is actually 70S only.

Bacteria has many flagellar filaments (not just one) which rotate independently, while flagellar filaments in archaea forms a bundle that rotate as a single assembly.

Plasma membrane of the archaea doesn’t have fatty acids, it has phytanyl.