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MDCAT Biology QUESTION #4171
Question 1
Which of the following base pairing maintains the constant diameter of the DNA double helix as per Watson and Crick's model?
  • Purine – Purine
  • Pyrimidine – Pyrimidine
  • Purine – Pyrimidine✔️
  • Sugar-Phosphate
Correct Answer Explanation
Purine-Pyrimidine pairing maintains constant diameter because purines are larger and pyrimidines are smaller, balancing the width.