Discussion
Which one of the following characteristics is ABSENT in Archaea?
Answer: C
The characteristic absent in Archaea is peptidoglycan.
Peptidoglycan (murein), built from N-acetylglucosamine and N-acetylmuramic acid, is found only in the cell walls of Bacteria. Its absence is one of the features that separates the Archaea from them, and is why archaea are insensitive to penicillin and lysozyme.
The other three do occur in Archaea. Some methanogens have pseudomurein, a look-alike polymer that uses N-acetyltalosaminuronic acid and β-1,3 links. A paracrystalline S-layer of protein or glycoprotein is the most common archaeal cell wall. Archaea typically have a single circular chromosome, like bacteria.
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