Match the following classification of amino acids on the basis of side chain:
Correct answer: C. i and D, ii and C, iii and B, iv and A
- A. i and A, ii and B, iii and C, iv and D
- B. i and B, ii and A, iii and D, iv and C
- C. i and D, ii and C, iii and B, iv and A
- D. i and C, ii and D, iii and A, iv and B
Explanation
The amino acids can be classified based on the nature of their side chains. I. Non-polar amino acids have side chains that are hydrophobic and do not interact with water. Examples include alanine (Ala). II. Polar amino acids have side chains that are hydrophilic and interact with water. Examples include asparagine (Asn). III. Acidic amino acids have side chains that are negatively charged at physiological pH. Examples include aspartic acid (Asp). IV. Basic amino acids have side chains that are positively charged at physiological pH. Examples include arginine (Arg). So, i and D (non-polar and Ala), ii and C (polar and Asn), iii and B (acidic and Asp), and iv and A (basic and Arg) are correctly matched.
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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