You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "what are the final electron acceptors for the electron transport chains in light reactions?" whose answer is NADP.
Each document should contain about 30 words, and these documents should contain useful information.

Query: final electron acceptors for the electron transport chains in light reactions
Useful Output:

Doc 1: Both copper- and iron-containing proteins function in electron transport between water and the final electron-acceptor molecule of the light
Doc 2: Step 4. After multiple redox transfers, the electron is delivered to a molecule known as the terminal electron acceptor. In the case of humans,
Doc 3: Electron transport chain. Harvard Online•3M views · 17:46. Go to channel · Photosynthesis - Light Dependent Reactions and the Calvin Cycle.
Doc 4: These electrons can be transferred to ferredoxin, the final electron acceptor of the light stage. No transfer of electrons from water to
Doc 5: In the light-dependent reactions, light energy and water are used to make ATP, NADPH, and oxygen (O2). The proton gradient used to make the ATP