Question

what is label #2 pointing to?

adenine

tbymine
deoxyribose sugar
phosphate
guanine
cytosine
hydrogen bond

Explanation:

In a DNA structure, the phosphate group is represented by a circle. In the given diagram, label #2 is a circle which corresponds to the phosphate group. Adenine, thymine, guanine, and cytosine are nitrogen - containing bases (represented by hexagons or other ring - like structures in the diagram). Deoxyribose sugar is represented by a pentagon (label #3). Hydrogen bonds are the bonds between the nitrogenous bases (not a single - entity label like #2).

Answer:

phosphate