| A | B |
|---|
| autotrophs | plants that make their own food. |
| heterotrophs | obtain energy from the foods they consume. |
| adenosine triphosphate | a principal chemical compound that cells use to store and release energy. |
| photosynthesis | the process of plants using the energyof sunlight to convert water and carbon dioxide into high-energy carbohydrates-sugars-starches-and oxygen. |
| pigments | light absorbing molecules. |
| chlorophyll | plants principal pigment. |
| thylakoids | saclike photosynthetic membranes. |
| photosystems | proteins in the thylakoid membrane that organize chlorophyll and other pigments into clusters. |
| stroma | the region outside the thylakoid membranes. |
| NADP+ | a carrier molecule. |
| light-dependent reactions | requiring light. |
| ATP synthase | a cell protein that spans the membrane and allows H+ ions to pass through it. |
| Calvin cycle | reactions of photosynthesis in which energy from ATP and NADPH is used to build highenergy compounds such as sugars. |
