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A segment of DNA has 120 adenine and 120 cytosine bases. The total number of nucleotides present in the segment is

(a)120 

(b) 240

(c) 60 

(d) 480

1 Answer

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Best answer

Correct option  (d)480

Explanation :

According to Chargaff's ruIe, 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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