The nature of the amino acid 'lysine' is:
Correct answer: D. Basic
- A. Neutral
- B. Acidic
- C. Amphoteric
- D. Basic
Explanation
A is incorrect as lysine is not neutral.B is incorrect as lysine is not acidic.C is incorrect as lysine is not amphoteric.D is correct as st a pH inferior to their pK, the lysine, arginine and histidine side chains accept an H+ ion (proton) and are positive charged. They are therefore basic.
This question appeared on the UHS MDCAT 2010 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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