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

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240

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120

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480

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Solution

The correct option is B 480
According to Chargaff’s rule, the amount of adenine is always equal to that of thymine and the amount of guanine is always equal to that of cytosine.
A = T(120), G = C(120)
The total number of nucleotides would be 120 × 4 = 480.

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A short length of double stranded DNA molecule contains 120 adenine and 120 cytosine Bases. The total number of nucleotides in this DNA fragment is

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