Question

1. an analogy for dna is that of a twisted ladder. components make up the rails of the ladder and other components make up the rungs. which components make up rungs of the ladder in the analogy?

only nitrogenous bases
phosphates and deoxyribose
phosphate groups and nitrogenous bases
deoxyribose and nitrogenous bases
clear all

Explanation:

DNA is often described as a twisted ladder (double - helix). The sides (rails) of the ladder are made up of phosphate and deoxyribose (sugar - phosphate backbone). The rungs of the ladder are made up of pairs of nitrogenous bases (adenine - thymine and cytosine - guanine).

Answer:

Only nitrogenous bases