BIO NMDCAT BIOLOGICAL MOLECULES

nmdcat.online June 27, 2026

During the formation of the double helix, the two anti-parallel strands of DNA are held together by

A. Covalent phosphodiester bonds

B. Strong ionic interactions between sugar molecules

C. Hydrogen bonds between complementary nitrogenous bases

✓

D. Hydrophobic interactions between deoxyribose sugars

📝 Explanation

The two strands of the DNA double helix are physically linked by hydrogen bonds between complementary base pairs (A-T and G-C). The backbone of each individual strand is held together by covalent phosphodiester bonds.

📖 Additional Information

Covalent phosphodiester bonds
Strong ionic interactions between sugar molecules
Hydrogen bonds between complementary nitrogenous bases
Hydrophobic interactions between deoxyribose sugars

The two strands of the DNA double helix are physically linked by hydrogen bonds between complementary base pairs (A-T and G-C). The backbone of each individual strand is held together by covalent phosphodiester bonds.

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