Histidine acts as _ in nature?
Correct answer: D. Acidic and Basic
- A. Acidic
- B. Neutral
- C. Basic
- D. Acidic and Basic
Explanation
Histidine is an amino acid that can act as both an acid and a base due to the presence of an imidazole side chain. The imidazole ring can donate a proton (H+ ion) from its nitrogen atoms, making it acidic, or it can accept a proton, making it basic. This dual behavior makes histidine amphoteric in nature.
This question appeared on the NUMS 2019 (cancelled sitting) paper, which you can sit online with every answer explained.
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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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