Discussion
In DNA double helix, the two DNA chains are held together by
Answer: B
Correct answer: hydrogen bonds between the pair of bases
The two strands are held together by hydrogen bonds between the paired bases - two between A and T, three between G and C - helped by base stacking. Individually these bonds are weak, which is what allows helicase to separate the strands; collectively, over thousands of pairs, they hold the duplex firmly. The covalent bonds run along each backbone, not across.
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