Word Count : 257

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Amino acids are the fundamental building blocks of proteins, and their physical and chemical properties directly determine how proteins fold, interact, and perform biological functions. Each amino acid contains an amino group, a carboxyl group, a hydrogen atom, and a variable side chain (R group). The nature of the R group ______ __________ __________ ____ _________ ____ ______ __________ ____ ________.
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