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

Ans.

DNA is made up of a polymers of pentose sugar, nitrogen bases, and phosphate molecules, known as nucleotides. In a DNA molecule, two DNA strands twist around each other and represent a twisted ladder.

The alternative sugar and phosphate groups make rails of the ladder, while steps or rungs of ladder are made by pairs of nitrogenous bases that joined with the help of hydrogen bonds between them.

Thus, the correct answer is option). 'nitrogenous base pairs.'

the fossil record provides evidence of a common ancestor to many species.