In DNA molecule, which of the following is complementary base pair?

Cytosine and adenine

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Adenine and thymine

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Adenine and guanine

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Cytosine and thymine

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Solution

The correct option is B Adenine and thymine
The double helical DNA is made up of a nitrogenous base, sugar, and phosphate. The nitrogenous bases are of two types purines and pyrimidines. Purines pairs with pyrimidines. Adenine pairs with thymine with help of double hydrogen bonds while guanine pairs with cytosine with help of triple hydrogen bonds.
So, the correct answer is option B.

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Similar questions

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.