Thymine always pairs with Adenine, and Cytosine always pairs with Guanine.

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Multiple Choice

Thymine always pairs with Adenine, and Cytosine always pairs with Guanine.

Explanation:
Base pairing rules explain which bases pair with one another in DNA. Thymine pairs with adenine and cytosine pairs with guanine because of complementary shapes and hydrogen bonding. This pairing keeps the DNA double helix uniform in width and provides the pattern the cell uses to accurately copy genetic information during replication and to read it during transcription. The statement is a direct description of how bases pair, which is exactly what the base pairing rules describe. The other terms refer to processes or building blocks rather than the specific pairing pattern itself.

Base pairing rules explain which bases pair with one another in DNA. Thymine pairs with adenine and cytosine pairs with guanine because of complementary shapes and hydrogen bonding. This pairing keeps the DNA double helix uniform in width and provides the pattern the cell uses to accurately copy genetic information during replication and to read it during transcription. The statement is a direct description of how bases pair, which is exactly what the base pairing rules describe. The other terms refer to processes or building blocks rather than the specific pairing pattern itself.

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