All amino acids found in proteins are:
Correct answer: A. ɑ-amino acids
- A. ɑ-amino acids
- B. β-amino acids
- C. Both ɑ and β
- D. None of the above
Explanation
The correct answer is that all amino acids found in proteins are ɑ-amino acids. These are characterized by the presence of the amino group bonded to the alpha carbon, which is the carbon atom directly adjacent to the carboxyl group. This structure is crucial for the formation of peptide bonds during protein synthesis. Although β-amino acids exist in nature, they are not incorporated into proteins. Proteins are specifically constructed from the 22 genetically encoded alpha-amino acids. Therefore, options B, C, and D are incorrect.
This question appeared on the ETEA MDCAT 2012 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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