The number of purines in a segment of DNA molecule is 68. What will be the number of pyrimdines in this segment ?

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Solution

The correct option is B 68
According to the Chargaff rule of base pairing, the DNA from any cell of an organism should have a 1:1 ratio of pyrimidine (thymine and cytosine) and purine (adenine and guanine) bases. It means that in DNA, the ratio of pairing between adenine and thymine and between guanine and cytosine will always be equal. It also specifies that in DNA, the amount of guanine is equal to the cytosine and the amount of adenine is equal to the thymine. So, if the number of purines in a segment of DNA is 68, the number of pyrimidines in the segment will be also 68.

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Statement 1: The four nitrogen bases in a DNA molecule are guanine, thymine adenine, cytosine.

Statement 2: Where adenine and thymine are purines and guanine and cytosine are pyrimidines.

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