Essential amino acids are___________________?
Correct answer: B. 10
- A. 5
- B. 10
- C. 15
- D. 20
Explanation
In the traditional school-level classification, humans require 10 essential amino acids from the diet because the body cannot synthesise them adequately. The number 20 refers to the standard amino acids used to build proteins, not the essential subset. A student may choose 20 by confusing all protein-forming amino acids with essential amino acids.
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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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