Question

the diagram shows a single strand of dna. which label is indicating the correct structure? sugar - phosphate backbone ribose group nitrogenous base phosphate group

Explanation:

DNA has a sugar - phosphate backbone. The diagram shows the correct structure of the sugar - phosphate backbone with alternating sugar and phosphate groups. DNA contains deoxyribose sugar, not ribose (so ribose group is incorrect). The nitrogenous base and phosphate group labels are just parts of the overall structure, and the sugar - phosphate backbone is the main structural element correctly indicated here.

Answer:

Sugar - phosphate backbone