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Which of the following is correct about H-bonding in nucleotides?

1. A --- A and T --- T
2. G --- T and A --- C
3. A --- G and T --- C
4. A --- T and G --- C

Correct answer: A --- T and G --- C

Solution

In DNA, adenine (A) pairs with thymine (T) via two hydrogen bonds, and guanine (G) pairs with cytosine (C) via three hydrogen bonds. This is a fundamental concept in nucleic acid structure.

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