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

24. An increase in the collective ratio of G-C base pairs relative to A-T base pairs within a DNA fragment results in

A. A lower melting temperature (Tm​) due to weak bonds
B. A higher melting temperature (Tm​) due to triple hydrogen bonding
✓
C. Spontaneous conversion of the helix into a linear RNA molecule
D. The immediate exclusion of all histone proteins

📝 Explanation

G-C pairs are linked by three hydrogen bonds, which require more thermal energy to disrupt than the two hydrogen bonds holding A-T pairs together.

📖 Additional Information

  • A lower melting temperature (Tm​) due to weak bonds
  • A higher melting temperature (Tm​) due to triple hydrogen bonding
  • Spontaneous conversion of the helix into a linear RNA molecule
  • The immediate exclusion of all histone proteins

G-C pairs are linked by three hydrogen bonds, which require more thermal energy to disrupt than the two hydrogen bonds holding A-T pairs together.

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