Biology

The correct answer is: A.Sugar and Phosphate

The sides (or backbones) of a DNA molecule are made up of alternating sugar (specifically deoxyribose) and phosphate groups. These form the structural framework that supports the nitrogenous bases in the center of the DNA double helix.

Explanation:

A.Sugar and Phosphate: In DNA, the backbone is composed of repeating units of deoxyribose (a sugar) and phosphate groups. The sugar of one nucleotide is linked to the phosphate of the next nucleotide by a phosphodiester bond.

B.Fatty Acid and Glycerol: This is the structure of lipids, not DNA. Lipids are made of fatty acids and glycerol, whi...