The number of amino acids commonly found in natural proteins is
- 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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