Identify the incorrect statement/s from the following with respect to DNA.

Adenine and cytosine are purines.

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Nitrogenous bases are joined by hydrogen bonds.

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DNA is made up of sugar and phosphate molecules only.

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Adenine always pairs with guanine.

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Solution

The correct option is D Adenine always pairs with guanine.

DNA is made up of a sugar-phosphate backbone and four types of nitrogenous bases - adenine, thymine, guanine and cytosine.

Adenine and guanine are called purines, while cytosine and thymine are called pyrimidines.

Adenine always pairs with thymine and cytosine with guanine, via hydrogen bonding.

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