A polypeptide chain contains 120 amino acids.The number of DNA nucleotides that would be required to code for this polypeptide chain are
Correct answer: C. 360
- A. 40
- B. 120
- C. 360
- D. 480
Explanation
A polypeptide chain containing 120 amino acids requires a specific number of DNA nucleotides to be coded. Each amino acid is coded by a set of three nucleotides known as a codon. Therefore, for 120 amino acids, you need 120 x 3 = 360 nucleotides.Option A (40) is incorrect because it underestimates the number of nucleotides needed per amino acid. Option B (120) is incorrect as it confuses the number of amino acids with the number of nucleotides. Option D (480) is incorrect because it overestimates the number of nucleotides, suggesting four nucleotides per amino acid instead of three.
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