The molecular weight of a polypeptide is 70,000. Determine the length of the gene encoding it if the molecular weight of one amino acid is on average 100, and the distance between adjacent nucleotides in the DNA chain is 0.34 nm.
1) the number of amino acids in the polypeptide: 70,000: 100 = 700;
2) the number of nucleotides of the coding region of DNA (gene): 700×3 = 2100;
3) the length of the coding region of DNA (gene): 2100 x 0.34 = 714 nm.
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