Which are purines?

Adenine and Guanine

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Adenine and Thymine

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Cytosine and Thymine

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Cytosine and Guanine

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Solution

The correct option is A Adenine and Guanine
The nitrogenous bases are purines and pyrimidines. The purines are adenine and guanine. The pyrimidines are thymine and cytosine. The purines are double ring structure while the pyrimidines are the single ring made up of carbon and nitrogen. Purines pair with the pyrimidines by hydrogen bonds. Adenine pairs with thymine by two hydrogen bond while the cytosine pairs with the guanosine by three hydrogen bonds.
So, the correct answer is 'Adenine and Guanine'.

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Similar questions

Adenine and guanine are pyrimidines.

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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