Question

how does atp supply energy for cellular activities?
by breaking off a phosphate group from its structure
by releasing the sugar molecule from its structure
by adding a phosphate group to its structure
by attaching itself to a glucose molecule

Explanation:

ATP (adenosine triphosphate) has three phosphate groups. When the bond holding the out - most phosphate group is broken (hydrolysis), energy is released. This is how ATP supplies energy for cellular activities. Adding a phosphate group (to form ATP from ADP) stores energy, not releases it. Releasing the sugar molecule or attaching to a glucose molecule is not the way ATP supplies energy.

Answer:

by breaking off a phosphate group from its structure