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

15. The chemical group located specifically at the 3′ terminus of a functional DNA strand is a

A. Phosphate group
B. Free hydroxyl group (-OH)
✓
C. Methyl group
D. Ketone group

📝 Explanation

The 3' end of a nucleic acid strand terminates at the third carbon of the sugar ring, which carries a free hydroxyl group.

📖 Additional Information

  • Phosphate group
  • Free hydroxyl group (-OH)
  • Methyl group
  • Ketone group

The 3' end of a nucleic acid strand terminates at the third carbon of the sugar ring, which carries a free hydroxyl group.

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