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BIO NMDCAT Structure of DNA
nmdcat.online July 3, 2026

20. The hydrogen bonds that maintain the complementary base pairing of the DNA double helix are situated

A. On the very outside of the sugar-phosphate ribbon
B. Between the inward-facing nitrogenous bases of opposing strands
✓
C. Connecting the 3' and 5' carbon locations of adjacent nucleotides
D. Linking histone proteins to the chromosome core

📝 Explanation

The hydrophilic sugar-phosphate backbones face the aqueous exterior, while the nitrogenous bases point inward to hide from water and form pairs.

📖 Additional Information

  • On the very outside of the sugar-phosphate ribbon
  • Between the inward-facing nitrogenous bases of opposing strands
  • Connecting the 3' and 5' carbon locations of adjacent nucleotides
  • Linking histone proteins to the chromosome core

The hydrophilic sugar-phosphate backbones face the aqueous exterior, while the nitrogenous bases point inward to hide from water and form pairs.

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