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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DNA structure includes nucleotides made of deoxyribose, phosphate and nitrogenous bases, arranged in two antiparallel polynucleotide strands. Questions cover the double helix, phosphodiester and hydrogen bonds, complementary base pairing between adenine and thymine and between guanine and cytosine, and the significance of major and minor grooves.
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