Which of the following statements are correct regarding amino acids ? A. They are substituted methanes. B. Serine is an aromatic amino acid. C. Valine is a neutral amino acid. D. Lysine is an acidic amino acid. Choose the correct answer from the options given below :
C. A and C only
Amino acids are organic compounds containing an amino group and an acidic group as substituents on the same carbon, i.e., the -carbon. Therefore, they are considered substituted methanes. Statement A is correct. Serine contains a hydroxymethyl group ( -CH _2 OH ) as its side chain and is an aliphatic amino acid, not an aromatic one. Aromatic amino acids include phenylalanine, tyrosine, and tryptophan. Statement B is incorrect. Valine contains one amino group and one carboxyl group, making it a neutral amino acid. Statement C is correct. Lysine contains two amino groups and one carboxyl group, making it a basic amino acid, not an acidic one. Acidic amino acids include aspartic acid and glutamic acid. Statement D is incorrect. Thus, only statements A and C are correct. Answer: A and C only
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