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

Answer 1

Answer - C
The nitrogenous base pairs on the structure of the DNA resemble the rungs of the ladder. Alternating deoxyribose sugars and the phosphate groups form the rails of the ladder.

Answer 2

The correct answer is nitrogenous base pairs.

Step-by-step explanation:

DNA is formed of polymers of nitrogenous bases, pentose sugar, and phosphate molecules called nucleotides. In the molecule of DNA, the two strands get twist around each other and demonstrate a twisted ladder.

The alternative phosphate groups and the sugar forms the rails of the ladder, while the rungs or steps of the ladder are formed by the pairs of nitrogenous bases, which are attached to each other with the help of hydrogen bonds in between them. Hence, the correct answer is nitrogenous base pairs.