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The quantity of adenine equals that of thymine, and guanine equals cytosine.

1. Adenine
2. Guanine
3. Cytosine
4. Thymine

Correct answer: Adenine

Solution

According to Chargaff's rule, in DNA, the amount of adenine (A) equals thymine (T), and the amount of guanine (G) equals cytosine (C).

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