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In a DNA double helix, the two strands are oriented in opposite directions, with one running 5' to 3' and the other 3' to 5'. These strands are connected by hydrogen bonds between complementary base pairs. Adenine (A), a purine, pairs with thymine (T), a pyrimidine, while cytosine (C), a pyrimidine, pairs with guanine (G), a purine. This complementary pairing creates a precise fit between the bases and is stabilized by hydrogen bonding.

1. Correct
2. Incorrect
3. Partially correct
4. Not applicable

Correct answer: Correct

Solution

The statement is correct as it accurately describes the structure of DNA, including the antiparallel strands, complementary base pairing, and hydrogen bonding between purines and pyrimidines.

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