Identify the mismatched purine-pyrimidine pair among the following options.

Adenine - Thymine

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Thymine - Adenine

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Guanine - Cytosine

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Thymine - Cytosine

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Solution

The correct option is D
Thymine - Cytosine

Adenine (a purine) and Thymine (a pyrimidine) always form a pair, while Guanine (a purine) and Cytosine (a pyrimidine) form another pair. Thymine and Cytosine are both pyrimidines, and cannot pair up.

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Identify the mismatched purine-pyrimidine pair among the following options.

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