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B
Glycoproteins
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C
Peptidoglycan
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D
Amides
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Solution
The correct option is A Proteins Amino acids are the basic units or monomers of proteins. They can occur in two forms, namely L- and D-forms. All amino acids, except glycine, occur in both forms. In humans, most amino acids present in proteins are in L-forms. However, D-form amino acids are also found in mammals. D-amino acids are commonly found in bacteria.