In DNA helix, cytosine is paired with guanine by

two hydrogen bonds

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three hydrogen bonds

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phosphate bond

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covalent bond

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Solution

The correct option is B three hydrogen bonds
Base pairing in DNA double helix
The nitrogenous bases of each DNA strand in a double helix are projected towards the inner side and pair with the complementary base of the complementary strand. Adenine pairs with thymine using 2 hydrogen bonds and cytosine pairs with guanine using 3 hydrogen bonds.

Final answer
(C) three hydrogen bonds

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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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