1) Plants that fix CO2 into organic acids at night when the stoma are open and carry out the Calvin cycle during the day when the stoma are closed are called 1) _____ A) C3 plants. B) C4 plants. C) CAM plants. D) Only A and B are correct. E) A, B, and C are correct. 2) Photorespiration lowers the efficiency of photosynthesis by removing which of the following from the Calvin cycle? A) glyceraldehyde phosphate molecules B) ribulose bisphosphate molecules C) RuBP carboxylase molecules D) carbon dioxide molecules E) ATP molecules 3) Assume a thylakoid is somehow punctured so that the interior of the thylakoid is no longer separated from the stroma. This damage will have the most direct effect on which of the following processes A) the splitting of water B) the reduction of NADP+ C) the absorption of light energy by chlorophyll D) the synthesis of ATP E) the flow of electrons from photosystem II to photosystem I 4) Why are C4 plants able to photosynthesize with no apparent photorespiration? A) They conserve water more efficiently. B) They exclude oxygen from their tissues. C) They do not carry out the Calvin cycle. D) They are adapted to cold, wet climates. E) They use a more efficient enzyme to initially fix CO2. 5) Which of the following statements is TRUE of fermentation? A) It produces more energy per glucose molecule than does aerobic respiration. B) It produces a net gain of NADH. C) It produces a net gain of ATP. D) It is an aerobic process. E) It can be performed only by bacteria.
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Photosynthetic pigments are found in: A. Photosystem I B. Photosystem II C. Stroma D. Photosystems I & II E. All of the listed locations The second part of photosynthesis (Calvin Cycle), after the light reactions, cannot occur unless it has access to: A. NADPH, ATP & Carbon Dioxide (CO2) B. Glucose (C6H12O6) & Oxygen (O2) C. light and water D. all of these answers One difference between normal cells and cancer cells is that cancer cells: A. continue to divide, unregulated, due to faulty checkpoints. B. exist in a perpetual non-dividing state. C. skip the mitotic phase of the cell cycle. Both CAM and C4 plants (unlike C3 plants): A. open stomata only at night B. initially fix CO2 with the Rubisco enzyme C. rely on bundle-sheath cells D. initially fix CO2 with the PEP carboxylase enzyme E. do not replicate their DNA during the cell cycle.
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QUESTION 1 The oxygen that all oxygen-consuming organisms (like you) inhale or take in by diffusion comes from the breakdown of carbon dioxide photosynthesizing organisms the upper atmosphere oxygen containing molecules (such as NO3 and SO4) in the air that are split QUESTION 2 What absorbs light energy in plants? photons Rubisco enzymes chlorophyll QUESTION 3 The light reactions of photosynthesis occur in the ____________ and the carbon reactions (Calvin cycle) occur in the _____________. cytochromes, stroma thylakoid membranes, stroma reaction centers, vacuoles reaction centers, photosystems QUESTION 4 At the end of the light reactions, the energy rich molecules, ATP and NADPH have been produced ATP and NADPH have been used glucose has been produced the chlorophyll molecules have been consumed QUESTION 5 When light strikes chlorophyll molecules, they lose electrons, which are ultimately replaced by splitting water breaking down ATP removing them from NADPH they are not replaced
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ACROSS 1. How carbon dioxide enters and oxygen leaves the leaf of a plant 2. The number of carbon dioxide you need for the Calvin Cycle to make 1 sugar molecule 3. This product of photosynthesis is used for aerobic respiration 4. A stack of thylakoid discs is called this 5. The sun provides this reactant for photosynthesis 6. The process by which carbon dioxide is converted into sugars 7. Where the light reactions take place inside of the chloroplast 8. The atmospheric gas that plants convert into food 9. The green pigment that absorbs sunlight 10. Chlorophyll absorbs every color wavelength of sunlight except this 11. Part of the plant where photosynthesis generally occurs the most 12. Eighteen of this molecule is made during the light reactions in order to run the Calvin Cycle 13. These organisms can convert chemical energy into food DOWN 1. Where light independent reactions take place inside of the chloroplast. 2. The plant uses this product of photosynthesis 3. An enzyme used in the light independent reactions of photosynthesis 4. The organelle in eukaryotic plant and protest cells that conducts photosynthesis 5. Electron transport chains and ATP synthase are used to carry out this process 6. Multicellular and unicellular protists that serve as the primary producers of aquatic food chains 7. These belong to the plant kingdom, they serve was one of the types of primary producers of the terrestrial food chain and during the change of season they lose their leaves 8. Twelve of this molecule is made during the light reactions in order to run the Calvin Cycle 9. A prokaryote that can carry out photosynthesis
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