Which purine base is a component of nucleic acids and energy-carrying molecules and pairs with thymine in DNA?

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Multiple Choice

Which purine base is a component of nucleic acids and energy-carrying molecules and pairs with thymine in DNA?

Explanation:
Adenine is a purine base that appears in nucleic acids and in energy-carrying molecules. In DNA it pairs with thymine through two hydrogen bonds, helping to stabilize the double helix. Adenine is also the base found in ATP, the molecule cells use to store and transfer energy. Cytosine and thymine are pyrimidines, so they are not purines. Guanine is a purine, but it pairs with cytosine, not thymine. Thymine itself is a pyrimidine and pairs with adenine, but it’s not the purine base.

Adenine is a purine base that appears in nucleic acids and in energy-carrying molecules. In DNA it pairs with thymine through two hydrogen bonds, helping to stabilize the double helix. Adenine is also the base found in ATP, the molecule cells use to store and transfer energy. Cytosine and thymine are pyrimidines, so they are not purines. Guanine is a purine, but it pairs with cytosine, not thymine. Thymine itself is a pyrimidine and pairs with adenine, but it’s not the purine base.

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