| A | B |
|---|
| autotroph | organisms such as plants which make their own food |
| heterotroph | organisms such as animals that cannot use the sun's energy directly |
| adenosine triphosphate | one of the principal compounds that living things use to store energy |
| photosynthesis | plants use the energy of sunlight to convert water and carbon dioxide into oxygen and high-energy carbohydrates (sugars and starches) |
| pigment | light absorbing molecules that gather the sun's energy |
| chlorophyll | the principal pigment of plants and other photosynthetic organisms, light energy |
| thylakoid | the saclike body in chloroplasts made of photosynthetic membranes that contain photosystems |
| stroma | the region outside the thylakoid membranes in chloroplasts |
| NADP+ | (nicotinamide adenine dinucleotide phosphate) one of the carrier molecules that transfers high-energy electrons from chlorophyll to other molecules |
| light-dependent reactions | reactions of photosynthesis that use energy from light to produce ATP and NADPH |
| ATP synthase | a large protein that uses energy from H+ ions to bind ADP and a phosphate group together to produce ATP |
| Calvin cycle | reactions of photosynthesis in which energy from ATP and NADPH is used to build high-energy compounds such as sugars |
