All amino acids generally have an amino group, a carboxyl group, and an R group. The correct option is A.
Amino acids are organic molecules that encompass amino and carboxylic acid functional groups, in addition to a amino acid-specific side chain.
In terms of structure, amino acids are frequently composed of a carbon atom, a hydrogen atom, a carboxyl group, an amino group, and a variable group.
Amino acids are classified into four types based on their variable group: nonpolar, polar, negatively charged, and positively charged.
Thus, the correct option is A.
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