Biology. Chapter 8

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autotrophs

organisms that make their own food

heterotrophs

consumers, they rely on other organisms for their energy and food supply

ATP

one of the principal chemical compounds that living things use to store and release energy

photosynthesis

process by which plants use the sun's energy to convert water and carbon dioxide into sugars

pigment

light-absorbing molecule

chlorophyll

green pigment in plants that absorbs light energy used to carry out photosynthesis

thylakoids

saclike photosynthetic membranes

photosystems

light collecting units of the chloroplast

stroma

the region outside the thylakoid membranes

NADP+

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 synthesis

large protein that uses energy from H+ ions to bind ADP and a phosphate group together to make ATP

Calvin cycle

reactions of photosynthesis in which energy from ATP and NADPH is used to build high-energy compounds such as sugars

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