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12 Cards in this Set
- Front
- Back
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PHOTOSYSTEM
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the light collecting units of the chloroplast
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ELECTRON TRANSPORT CHAIN
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a series of proteins in which high-energy electrons are used to change ADP to ATP.
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What happens during the light-dependent reactions?
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The light-dependent reactions use water and energy from sunlight to make oxygen and change ADP and NADP+ into the energy carriers ATP and NADPH.
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What happens during the light-independent reactions?
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? During the light-independent reactions, ATP and NADPH are used to make high-energy sugars.
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what factors affect photosynthesis?
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Three important factors that affect photosynthesis are temperature, light intensity, and the availability of water.
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C4 Plants
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o C4 plants have a special chemical pathway that gets carbon into the Calvin cycle even when there is not much carbon dioxide available.
o The pathway uses extra ATP but lets the plants carry out photosynthesis when it is hot. Corn and sugar cane are examples of C4 plants. |
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CAM plants
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o CAM plants save water by taking air into their leaves only at night.
o In the dark, carbon dioxide is used to make acids. o During the day, these acids are turned back into carbon dioxide for photosynthesis. o Examples of CAM plants are pineapple trees, many desert cacti and ice plants. |
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electron transport chain
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1. Energy produced by the electron transport chain is used to pump hydrogen ions from the stroma to the inside of the thylakoid.
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photosystem
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a cluster of pigments and proteins that allows plants to absorb light energy and transfer it to electrons..
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Put the following events of the light-dependent reactions in the order in which they occur: photosystem I, photosystem II, making NADPH, and pumping hydrogen ions into the inside of the thylakoid.
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a. Photosystem II Light shining on pigments energizes electrons that come from water.
b. Electron transport chain: High energy electrons move down the chain, which pumps H+ ions to inside of the thylakoid c. Photosystem I: electrons are reenergized with more light. d. Electron Transport: the reenergized electrons are transferred to NADP+ to make NADPH |
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List at least three differences between the light dependent and light indpenedent reactions of photosynthesis.
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Light dependent
Light dependent reactions produce ATP and NADPH from energy captured from light. Needs light Takes place in thylokoids Light independent Light independent reactions fix carbon dioxide into glucose using the ATP and NADPH produced in the light dependent reactions. Do not need light Takes place in stroma |
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Where does this carbon from CO2 end up?
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Carbon becomes the building blocks that the plant cell uses to make sugars, lipids, amino acids and other compounds. From 2.3 carbon compounds: carbon bonds with hydrogen, oxygen, phosphorus, sulfur and nitrogen to form life’s molecules.
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