Acidic amino acids have________________?
Correct answer: C. 2 carboxylic groups and 1 amino group
- A. 2 amino groups and 1 carboxylic group
- B. 1 amino and 1 carboxylic groups
- C. 2 carboxylic groups and 1 amino group
- D. 2 amino and 2 carboxylic groups
Explanation
An acidic amino acid has one amino group and two carboxylic acid groups, so it has an extra carboxyl group capable of donating protons. Glutamic acid and aspartic acid are examples of this class. Students may choose option B because most standard amino acids have one amino and one carboxyl group, but that describes neutral amino acids rather than acidic ones.
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About Classification of Proteins
Proteins are classified by composition as simple, conjugated and derived proteins, and by shape as fibrous or globular proteins. The topic relates these classes to examples such as albumin, keratin, collagen, haemoglobin and casein, while distinguishing structural proteins from proteins with transport, catalytic or regulatory roles.
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