Which one of following amino acid is neither acidic nor a basic in nature ?
Correct answer: C. Proline
- A. Lysine
- B. Histidine
- C. Proline
- D. Glutamic acid
Explanation
Proline is considered neither acidic nor basic because its side chain does not provide an extra strongly acidic or basic group; it has one carboxyl and one secondary amino group. Lysine is basic, histidine is basic, and glutamic acid is acidic because of its additional carboxyl group. Students may choose histidine because its classification can seem less familiar, but its imidazole group can accept a proton.
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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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