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Question	Answer
Autotroph	Organisms that use sunlight or chemical energy to make their own food.
photosynthesis	The process of using light energy to make chemical energy in the formm of organic compounds, primarily carbohydrates.
heterotroph	An organism that must get its energy from food made by autotrophs
chloroplast	The organelle that contains thylakoids and is responsible for photosynthesis.
thylakoid	A membranous sac where photosynthetic reactions take place.
granum	A stack of thylakoids
stroma	The jelly-like fluid within a chloroplast where the Calvin cycle takes place.
pigment	A protein capable of absorbing light to produce energy.
chlorophyll	A green pigment that absorbs red, blue, violet, and red light, but reflects green and some yellow.
carotenoid	An accessory pigment that absorbs greens and reflects reds or oranges.
photosystem	A cluster of pigment molecules that absorbs various wavelengths of ligh
primary electron acceptor-	A molecule in the electron transport chain that accepts the electrons from the chlorophyll molecules of the photosystem.
electron transport chain	A series of molecules that perform oxidation-reduction reactions as they pass electrons from one to the other.
chemiosmosis	The pumping of hydrogen ions across a membrane through an ATP synthase protein pump.