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

4. The chemical group located specifically at the 5′ terminus of a single DNA strand is a

A. Hydroxyl group
B. Phosphate group
✓
C. Carboxyl group
D. Amino group

📝 Explanation

The 5' end of a DNA or RNA strand terminates in a phosphate group attached to the 5' carbon of the pentose sugar.

📖 Additional Information

  • Hydroxyl group
  • Phosphate group
  • Carboxyl group
  • Amino group

The 5' end of a DNA or RNA strand terminates in a phosphate group attached to the 5' carbon of the pentose sugar.

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