1. The Reactions of Photosynthesis 8.3

2. Thylakoid Saclike photosynthetic membrane found in chloroplasts.

3. Photosystem Light-collecting units of the chloroplast.

4. Stroma Region outside the thylakoid membranes in the chloroplasts.

5. NADP+ One of the carrier molecules that transfers high-energy electrons from chlorophyll to other molecules.

6. Light-Dependent Reactions Reactions of photosynthesis that use energy from light to produce ATP and NADPH.

7. ATP Synthase Large protein that uses energy from H+ ions to bind ADP and a phosphate group together to produce ATP.

8. Calvin Cycle Reactions of photosynthesis in which energy from ATP and NADPH is used to build high-energy compounds such as sugars.

9. Key Concept What happens in the light-dependent reactions? The light-dependent reactions produce oxygen gas and convert ADP and NADP+ into the energy carriers ATP and NADPH.

10. Key Concept What is the Calvin cycle? Reactions of photosynthesis in which energy from ATP and NADPH is used to build high-energy compounds such as sugars.