A nitrogenous base found in DNA and RNA; pairs with guanine.

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Multiple Choice

A nitrogenous base found in DNA and RNA; pairs with guanine.

Explanation:
Base pairing follows complementary rules in nucleic acids, with specific partners helping stabilize the structure. Cytosine pairs with guanine because they fit together chemically and form three hydrogen bonds, which provides strong, stable interactions in both DNA and RNA contexts. This pairing helps maintain the correct geometry of the nucleic acid strands. Adenine pairs with thymine in DNA and with uracil in RNA, so those bases do not pair with guanine. Thymine is found in DNA only, while uracil is found in RNA. Therefore, cytosine is the base found in DNA and RNA that pairs with guanine.

Base pairing follows complementary rules in nucleic acids, with specific partners helping stabilize the structure. Cytosine pairs with guanine because they fit together chemically and form three hydrogen bonds, which provides strong, stable interactions in both DNA and RNA contexts. This pairing helps maintain the correct geometry of the nucleic acid strands. Adenine pairs with thymine in DNA and with uracil in RNA, so those bases do not pair with guanine. Thymine is found in DNA only, while uracil is found in RNA. Therefore, cytosine is the base found in DNA and RNA that pairs with guanine.

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