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

49. The structural feature that makes a DNA double helix anti-parallel is that one strand terminates in a free 5′-phosphate while the matching strand terminates in a

A. Free 5'-hydroxyl group
B. Free 3'-hydroxyl group
✓
C. Free 3'-phosphate group
D. Methylated guanosine cap

📝 Explanation

To form proper hydrogen bonds across the core, the twin strands must line up in opposite orientations, pairing a 5' end with a 3' end.

📖 Additional Information

  • Free 5'-hydroxyl group
  • Free 3'-hydroxyl group
  • Free 3'-phosphate group
  • Methylated guanosine cap

To form proper hydrogen bonds across the core, the twin strands must line up in opposite orientations, pairing a 5' end with a 3' end.

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