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

17. An analysis of a double-stranded DNA sample shows that it contains 30% Adenine. The percentage of Cytosine present in this sample must be

A. 30%
B. 20%
✓
C. 40%
D. 70%

📝 Explanation

If A=30%, then T=30%, totaling 60%. The remaining 40% is split equally between Guanine (20%) and Cytosine (20%).

📖 Additional Information

  • 30%
  • 20%
  • 40%
  • 70%

If A=30%, then T=30%, totaling 60%. The remaining 40% is split equally between Guanine (20%) and Cytosine (20%).

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