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How does an archaean cell wall differ from a bacterial one?
AIt contains no peptidoglycan at all
BIt holds twice as much peptidoglycan
CIt is built from cellulose fibers
DIt is missing from every archaean
Answer & Solution
Correct answer: A. It contains no peptidoglycan at all
1. Archaean cell walls contain no peptidoglycan, which is the single clearest wall difference between the domains.
2. Four archaean wall types exist: pseudopeptidoglycan, polysaccharide, glycoprotein and pure protein.
3. Pseudopeptidoglycan resembles peptidoglycan in shape but carries different sugars in its chains.
4. Cellulose walls belong to plants, so that option describes a eukaryote.
5. Archaea do have walls, so the option claiming they lack one is wrong.
_Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 22 "Prokaryotes: Bacteria and Archaea", section 22.2 Structure of Prokaryotes_
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