NEET · Biology · STD 11 - 9. Biomolecules
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 :
- A C and D only
- B B and C only
- C A and C only
- D A and B only
Answer & Solution
Correct Answer
(C) A and C only
Step-by-step Solution
Detailed explanation
(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 \(\alpha\)-carbon. Therefore, they are considered substituted methanes. Statement A is correct.
Serine contains a hydroxymethyl group \(\left(- CH _2 OH \right)\) 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.
Amino acids are organic compounds containing an amino group and an acidic group as substituents on the same carbon, i.e., the \(\alpha\)-carbon. Therefore, they are considered substituted methanes. Statement A is correct.
Serine contains a hydroxymethyl group \(\left(- CH _2 OH \right)\) 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.
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