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

72. The presence of two hydrogen bonds between Adenine and Thymine compared to three between Guanine and Cytosine means that A-T rich regions of a gene

A. Are exceptionally rigid and resist unzipping
B. Melt and separate more easily under thermal or mechanical stress
✓
C. Contain higher quantities of deoxyribose sugars
D. Cannot be transcribed by bacterial RNA polymerases

📝 Explanation

Having fewer hydrogen bonds makes A-T rich regions easier to unzip, which is why replication origins and promoters are rich in A-T pairs.

📖 Additional Information

  • Are exceptionally rigid and resist unzipping
  • Melt and separate more easily under thermal or mechanical stress
  • Contain higher quantities of deoxyribose sugars
  • Cannot be transcribed by bacterial RNA polymerases

Having fewer hydrogen bonds makes A-T rich regions easier to unzip, which is why replication origins and promoters are rich in A-T pairs.

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