Question

the structure of dna resembles a twisted ladder. which structural components form the rungs of the ladder?
deoxyribose sugars
phosphate groups
nitrogenous base pairs
ribosomes

Explanation:

To determine the structural components forming the rungs of the DNA ladder (double helix), we analyze each option:

• Deoxyribose sugars and phosphate groups form the sides (backbone) of the DNA ladder, not the rungs.
• Ribosomes are cellular structures involved in protein synthesis, not part of DNA's structure.
• Nitrogenous base pairs (adenine - thymine, guanine - cytosine) form the rungs, as they connect the two strands of the double helix through hydrogen bonds.

Answer:

C. nitrogenous base pairs