DNA double helix is bound by_____________?
Correct answer: D. Hydrogen bond
- A. Covalent bond
- B. Vander wall forces
- C. Disulfide linkage
- D. Hydrogen bond
Explanation
The two DNA strands are held together mainly by hydrogen bonds between complementary bases, with adenine pairing with thymine and guanine with cytosine. Covalent phosphodiester bonds form each strand's backbone rather than joining the two strands.
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