The number of amino acids commonly found in natural proteins is
Correct answer: B. 20
- A. 4
- B. 20
- C. 64
- D. 100
Explanation
Twenty amino acids account for almost all natural protein, and their enormous number of possible sequences is what allows such variety of structure and function. The figure 64 is the number of codons in the genetic code, which is why several codons specify the same amino acid. Four is the number of bases in DNA.
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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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