BiomoleculesHard

Question

Asegment of DNA has 120 adenine and 120 cyesent in the segment is

Options

A.120
B.240
C.60
D.480

Solution

According to Chargaffs′s rule, molar amount of adenine is equal to that of thymine and cytosine equals to guanine, A + G = T + C, so a segment of DNA with 120 adenine base and 120 cytosine base will have same number of each thymine and guanine base (as, A = T and C = G), i.e., 120 thymine bases, 120 guanine bases, thus a total of 480 nucleotides.

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