Asked in PMC Practice Test 21 (2021) 2021Moderate
Which of the following elements is present in all proteins?
Correct answer: C. N
- A. S
- B. C
- C. N
- D. O
Explanation
Nitrogen is in all amino acids and nucleotides, and therefore in all proteins.
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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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