Photosynthesis doesn't *use* high energy molecules, it *produces* them. The energy input for photosynthesis comes from light, specifically sunlight.

Here's the breakdown:

* Light energy is captured by chlorophyll within chloroplasts.

* This light energy is used to split water molecules, releasing electrons and protons (H+ ions).

* The electrons are passed along an electron transport chain, releasing energy that is used to pump protons across a membrane. This creates a proton gradient.

* The proton gradient drives the production of ATP (adenosine triphosphate), which is a high-energy molecule used by the cell for various functions.

* The electrons also help convert carbon dioxide (CO2) into sugar (glucose), another high-energy molecule.

So, while photosynthesis doesn't use high-energy molecules, it produces two key high-energy molecules:

1. ATP: A universal energy currency used for many cellular processes.

2. Glucose: A sugar that serves as the primary energy source for most organisms.