Question

what component forms the backbone of dna?
a) phosphate and sugar molecules
b) fatty acids
c) ribose and deoxyribose
d) nitrogen bases and proteins

Explanation:

To determine the component forming the DNA backbone, recall DNA structure: The backbone of DNA is made of alternating phosphate groups and deoxyribose (a sugar) molecules, linked by phosphodiester bonds. Fatty acids are in lipids, ribose is in RNA, and nitrogen bases pair inside the helix (not the backbone), and proteins aren't part of DNA's backbone. So option A (Phosphate and sugar molecules) is correct.

Answer:

A. Phosphate and sugar molecules