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Uracil

Guanine

Adenine

Cytosine

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To determine the complementary base of thymine, we first need to understand the structure of thymine and its pairing rules in DNA. ### Step 1: Identify Thymine Thymine is one of the four nucleobases in the nucleic acid of DNA. Its chemical structure consists of a pyrimidine ring with a methyl group attached. The molecular formula for thymine is C5H6N2O2. ### Step 2: Understand Base Pairing In DNA, nucleobases pair specifically: adenine (A) pairs with thymine (T), and cytosine (C) pairs with guanine (G). This pairing occurs due to hydrogen bonding: - Adenine forms two hydrogen bonds with thymine. - Cytosine forms three hydrogen bonds with guanine. ### Step 3: Determine the Complementary Base Given that thymine is present, its complementary base is adenine. This means that wherever there is a thymine in one strand of DNA, there will be an adenine in the complementary strand. ### Conclusion Thus, the correct answer to the question regarding the complementary base of thymine is adenine. This pairing is crucial for the stability and fidelity of the DNA double helix structure.

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