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Answer : 3 the chemical properties of their R groups Explanation : Answer: C) the chemical properties of their R groups Explanation: Amino acids are organic compounds containing amine (-NH2) and carboxyl (-COOH) functional groups, along with a side chain (R group) specific to each amino acid. Depending on the nature of the side chain groups, three classes of aminoacids can e distinguished:1. Amino acids with H ond donor and acceptor groups.Histidine, lysine, aspartic acid, threonine,...2. Amino acids with donor grups only.Arginine, tryptophan and cysteine.3. Amino acids with acceptor groups only.Asparagine and glutamine.

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