The DNA double helix is similar to a twisted ladder.What makes up the sides holding the rungs together?

Question

Quizplus · Accepted Answer

The sides of the DNA double helix are made up of alternating units of phosphate groups and sugars - specifically, deoxyribose sugars. The phosphate groups and sugars are covalently bonded to each other, forming a backbone to the DNA molecule. The rungs of the DNA ladder are made up of nitrogenous bases - specifically, adenine (A), thymine (T), cytosine (C), and guanine (G), which are held together by hydrogen bonds.

The DNA Double Helix Is Similar to a Twisted Ladder