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B
carboxylic groups
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C
peptide bonds
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D
amino groups.
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Solution
The correct option is A R-groups The amino acid at the structural and functional unit of protein and they combine through peptide Bond to form proteins. The amino acids have one carboxyl group along with one amino group and a side chain which is different in all the amino acids.
On the basis of the side chain, amino acids are categorised into a variety of types, for example, simple amino acids, sulphur containing amino acids, aromatic amino acids and so on.