Which bases are purines?

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Multiple Choice

Which bases are purines?

Explanation:
Purines are nitrogenous bases with two ring structures. The purine family includes adenine and guanine, which is why those two bases are the correct answer. The other options don’t fit because cytosine and uracil are pyrimidines, meaning they have a single ring. Ribose and deoxyribose are sugars, not bases, and they form the backbone of RNA and DNA, not the bases themselves.

Purines are nitrogenous bases with two ring structures. The purine family includes adenine and guanine, which is why those two bases are the correct answer. The other options don’t fit because cytosine and uracil are pyrimidines, meaning they have a single ring. Ribose and deoxyribose are sugars, not bases, and they form the backbone of RNA and DNA, not the bases themselves.

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