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What kind of isomers can amino acids form? Which isomer is present in most living organisms?

don't major compounds of living organisms consist of modifications of hydrocarbons

Although D amino acids can be found in nature, only the L isomers are used to form proteins. The D isomers are most often found attached to the cell walls of bacteria and in antibiotics that attack bacteria. The presence of these D isomers protects the bacteria from enzymes the host organism uses to protect itself from bacterial infection by hydrolyzing the proteins in the bacterial cell wall.

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