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In a DNA double helix, adenine pairs with thymine through how many hydrogen bonds?
A{'text': 'Two', 'label': 'A'}
B{'text': 'Three', 'label': 'B'}
C{'text': 'One', 'label': 'C'}
D{'text': 'Four', 'label': 'D'}
Answer & Solution
Correct answer: A. {'text': 'Two', 'label': 'A'}
A pairs with T via 2 hydrogen bonds; G pairs with C via 3. This A=T, G=C rule reflects Chargaff's equivalence and gives a near-constant inter-strand distance.
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