According to Watson-Crick model, hydrogen bonding in a double-stranded DNA occurs between.

Adenine and guanine.

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Adenine and thymine.

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Cytosine and adenine.

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Guanine and thymine.

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Solution

The correct option is A Adenine and thymine.
According to Watson and Crick model, DNA is a double-stranded molecule in which sugar-phosphate backbones on the outside. There are purine and pyrimidine bases. Adenine and guanine are purine bases whereas cytosine and thymine are pyrimidine bases. In DNA, there are two hydrogen bonds between adenine and thymine nitrogenous bases and three hydrogen bonds between cytosine and guanine nitrogenous bases.
Thus, 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.

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