In the comparison of a DNA molecule to a twisted ladder, the rungs (footholds) of the ladder are
A) the backbones of the molecule.
B) deoxyribose linked to phosphate.
C) nitrogenous bases linked together.
D) deoxyribose linked to sulfate.
E) nitrogenous bases linked to phosphate.

Question

Quizplus · Accepted Answer

In the analogy comparing a DNA molecule to a twisted ladder, the rungs or footholds of the ladder represent the nitrogenous bases linked together through hydrogen bonds. The sides of the ladder are made up of alternating sugar (deoxyribose) and phosphate groups, not the rungs.

In the Comparison of a DNA Molecule to a Twisted