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

42. The spatial orientation where the nitrogenous bases are arranged perpendicular to the long axis of the double helix means they look like

A. Spokes of a bicycle wheel
B. Steps of a spiral staircase
C. Outside handrails of a ladder
D. Rings of an extended chain

📝 Explanation

The flat base pairs stack horizontally inside the core of the helix, resembling the sequential steps of a spiral staircase.

📖 Additional Information

  • Spokes of a bicycle wheel
  • Steps of a spiral staircase
  • Outside handrails of a ladder
  • Rings of an extended chain

The flat base pairs stack horizontally inside the core of the helix, resembling the sequential steps of a spiral staircase.

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