A section of a double-stranded DNA contains 150 nucleotides and codes for a polypeptide X.The number of amino acids in polypeptide X will be
Correct answer: D. 50 amino acids
- A. 25 amino acids
- B. 150 amino acids
- C. 75 amino acids
- D. 50 amino acids
Explanation
A section of DNA with 150 nucleotides will code for a polypeptide through a process where every three nucleotides (a codon) correspond to one amino acid. Therefore, to find the number of amino acids in the polypeptide X, you divide the total number of nucleotides by 3. Thus, 150 nucleotides / 3 = 50 amino acids.Options A, B, and C are incorrect because they do not accurately apply the nucleotide-to-amino acid conversion ratio.
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About Structure of DNA
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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