Which one of the following phrases describes a way that Archaea differ from Bact

Question

Which one of the following phrases describes a way that Archaea differ from Bacteria?
The Archaea are all pathogenic, they cause human disease, but many Bacteria are not human pathogens.
The ribosomes in Archaea have a size of 80S while those of Bacteria are 70S.
The Archaea are obligate intracellular parasites that lack ribosomes, tRNAs and energy producing metabolic pathways.
The genetic material of an Archaea cell is enclosed within a membrane-bound nucleus.
The cell wall material in Archaea is chemically different from the peptidoglycan of bacterial cell walls.

Explanation / Answer

Answer: The cell wall material in Archaea is chemically different from the peptidoglycan of bacterial cell walls.

Many archaeal membranes differ from other bacterial membranesnin having a monolayer with lipid molecules spanning the whole membrane.The walls lack peptidoglycan and are composed of proteins, glycoproteins, or polysaccharides.S-layer is present in archea, as seen bacteria also.

They differ from bacteria in lacking muramic acid in their cell walls and in possessing

(1) membrane lipids with ether-linked branched aliphatic chains,

(2) transfer RNAs without thymidine in the T or TC arm,

(3) distinctive RNA polymerase enzymes, and

(4) ribosomes of different composition and shape.

Thus although archaea resemble bacteria in their procaryotic cell structure, they vary considerably on the molecular level.

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