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25 Cards in this Set
- Front
- Back
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C3 plants (most common) |
rice, barley and soybean
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C4 plants |
corn, sugarcane , sorghum, and millets,
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CAM plants |
pineapple, cactus |
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Plants are photoautotrophs. What does this mean?
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They use light energy to drive the synthesis of organic molecules from inorganic materials.
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In autotrophic bacteria, where is chlorophyll located?
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in the infolded plasma membrane
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Early investigators thought the oxygen produced by photosynthetic plants came from carbon dioxide. In fact, it comes from _____.
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water
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In the electromagnetic spectrum, the type of radiation that we call visible light occurs between _____.
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ultraviolet radiation and infrared radiation
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Which of the following is a product of the light reactions of photosynthesis?
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oxygen, ATP, and NADPH
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When light strikes chlorophyll molecules, they lose electrons, which are ultimately replaced by _____.
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splitting water
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Carbon fixation involves the addition of carbon dioxide to _____.
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RuBP
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After 3-PGA is phosphorylated, it is reduced by _____.
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NADPH
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In the Calvin cycle, how many ATP molecules are required to regenerate RuBP from five G3P molecules?
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3 |
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The overall function of the Calvin cycle is _____.
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making sugar |
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Which of the following are products of the light reactions of photosynthesis that are utilized in the Calvin cycle?
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ATP and NADPH
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Where does the Calvin cycle take place?
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stroma of the chloroplast
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In C3 plants the conservation of water promotes _____.
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photorespiration
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In C4 and CAM plants carbon dioxide is fixed in the _____ of mesophyll cells.
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cytoplasm
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C4 plants differ from C3 and CAM plants in that C4 plants _____.
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transfer fixed carbon dioxide to cells in which the Calvin cycle occurs
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C4 plants occur more commonly in desert conditions because _____.
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they can fix carbon at the lower CO2 concentrations that develop when the stomata are closed
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Why are C4 plants able to photosynthesize with no apparent photorespiration?
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They use PEP carboxylase to initially fix CO2.
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CAM plants keep stomata closed in the daytime, thus reducing loss of water. They can do this because they _____.
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fix CO2 into organic acids during the night
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The light reactions of photosynthesis supply the Calvin cycle with
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ATP and NADPH.
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How is photosynthesis similar in C4 plants and CAM plants?
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In both cases, rubisco is not used to fix carbon initially.
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Stages of Calvin Cycle |
In fixation, the first stage of the Calvin cycle, light-independent reactions are initiated; CO2is fixed from an inorganic to an organic molecule. In the second stage, ATP and NADPH are used to reduce 3-PGA into G3P; then ATP and NADH are converted to ADP and NADP +, respectively. |
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chemiosmosis
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the movement of ions across a selectively permeable membrane, down their electrochemical gradient.
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