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

62. The structural dimension representing the distance across the double helix from one sugar-phosphate backbone directly to the other is

A. 0.34 nm
B. 2.0 nm
✓
C. 3.4 nm
D. 20 nm

📝 Explanation

The total cross-sectional width of the standard B-form DNA double helix is 2.0 nm (20 A˚).

📖 Additional Information

  • 0.34 nm
  • 2.0 nm
  • 3.4 nm
  • 20 nm

The total cross-sectional width of the standard B-form DNA double helix is 2.0 nm (20 A˚).

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