An acidic amino acid among the following is:a)Valineb)Prolinec)Ananine...
The correct answer is option 'D' (None of these).
Explanation:
Acidity in amino acids is determined by the presence of carboxyl groups (-COOH) in their molecular structure. When the carboxyl group is ionized, it releases a hydrogen ion (H+) and forms a negatively charged carboxylate ion (-COO-), making the amino acid acidic in nature.
Among the options given:
a) Valine: Valine is a nonpolar, aliphatic amino acid and does not contain a carboxyl group. Therefore, it is not acidic.
b) Proline: Proline is an imino acid and does contain a carboxyl group. However, the nitrogen atom in proline's side chain can react with the carboxyl group, forming a cyclic structure called a pyrrolidine ring. This ring structure reduces the acidity of proline. Therefore, proline is not considered an acidic amino acid.
c) Alanine: There seems to be a spelling mistake in the option provided. The correct name of the amino acid is "Alanine." Alanine is a nonpolar, aliphatic amino acid and does not contain a carboxyl group. Therefore, it is not acidic.
Based on the above explanations, none of the options provided (Valine, Proline, Alanine) are acidic amino acids. Hence, the correct answer is option 'D' (None of these).
An acidic amino acid among the following is:a)Valineb)Prolinec)Ananine...