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:

In the DNA double - helix structure (like a twisted ladder), the sides of the ladder are made of deoxyribose sugars and phosphate groups (alternating). The rungs of the ladder are formed by nitrogenous base pairs (adenine - thymine and cytosine - guanine). Ribosomes are cellular structures involved in protein synthesis and are not part of the DNA structure.

Answer:

nitrogenous base pairs