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6.1

The Light Reactions

QuestionAnswer
autotroph organisms that use energy from sunlight or from chemical bonds in inorganic substances to make organic compounds
photosynthesis the process to convert light energy from the sun into chemical energy in the form of organic compounds, primarily carbohydrates
heterotroph animals and other organisms that must get energy from food instead of directly from sunlight or inorganic substances
light reactions part of the first stage of photosynthesis, requires light to happen
chloroplast organelles found in the cells of plants and algae
thylakoid a system inside the inner membrane that is arranged as flattened sacs
granum a stack of thylakoids in chloroplasts
stroma one of many openings in a leaf or a stem of a plant that enable gas exchange to occur
pigment a substance that gives another substance or a mixture its color
chlorophyll a green pigment that is present in most plant cells, that gives plants their characteristic green color, and that reacts with sunlight, carbon dioxide, and water to form carbohydrates
carotenoid a class of pigments that are present mostly in plants and that aid in photosynthesis
photosystem in the thylakoid membranes of chloroplasts, a cluster of chlorophyll and other pigment molecules that harvest light energy for the light reactions of photosynthesis
primary electron acceptor the acceptor of the lost from chlorophyll A is a molecule in the thylakoid membrane
electron transport chain a series of molecules, found in the inner membranes of mitochondria and chloroplasts, through which electrons pass in a process that causes protons to build up on one side of the membrane
chemiosmosis in chloroplasts and mitochondria, a process in which the movement of protons down their concentration gradient across a membrane is coupled to the synthesis of ATP
Created by: blehrner
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