Amino acids are very small biomolecules with an average molecular weight of about 135 daltons. The 20 amino acids that are found within proteins convey a vast array of chemical versatility. Amino acid is a molecule that contains both amine and carboxyl functional groups. Amino acids play central roles both as building blocks of proteins and as intermediates in metabolism. The 20 amino acids that are found within proteins convey a vast array of chemical versatility. Protein substances make up the muscles, tendons, organs, glands, nails, and hair.

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