Unit 10questions(1)

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Biology

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Dec 6, 2023

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Unit 10: Photosynthesis Unit Overview The following unit provides an overview of photosynthesis. The structure and organization of the chloroplast is explained. The light reactions and Calvin- Benson cycles are both important processes that take place during the photosynthesis, so these processes are explained in detail with respect to the steps involved, the products formed, the overall importance and locations of these reactions. The significance of pigments is explored, with particular emphasis on the importance of chlorophyll. The linear and cyclic flow of electrons during photosynthesis is explained along with the differences and similarities between the two photosystems (I and II) used in photosynthesis. Section A: Multiple Choice Questions 1) Which products are formed during the light reactions of photosynthesis? A) ATP and NADH B) water and oxygen C) electrons and H+ D) ATP and NADPH E) ADP and NADP+ 2) Where do the light reactions take place? A) in the cytoplasm B) in the outer chloroplast membrane C) in the thylakoid membrane D) in a chlorophyll molecule E) in the stroma 3) Where does the Calvin cycle take place? A) in a chlorophyll molecule B) in the stroma C) in the outer chloroplast membrane D) in the thylakoid membrane E) in the cytoplasm

4) During photosynthesis, oxygen is produced by which of the following? A) transferring electrons from photosystem II B) chemiosmosis C) the reduction of NADP+ D) transferring electrons from photosystem I E) the splitting of water molecules 5) You notice that a plant has a yellowish green appearance. What wavelengths of light is this plant is absorbing? A) yellow, green and blue B) yellow and green C) red, green, and blue D) yellow and red E) blue and red 6) You notice that a plant has a yellowish green appearance. What wavelengths of light are NOT being absorbed by the pigments in this plant? A) yellow and green B) yellow, green and blue C) blue and red D) red, green, and blue E) yellow and red 7) Considering the reaction center pigment P700, which of the following is true? A) it is best at absorbing light at 700 nm B) it contains 700 chlorophyll molecules C) it is best at reflecting light at 700 nm D) it absorbs 700 photons per second. E) it can transfer 700 electrons per second 8) The linear flow of electrons in the light reactions leads to the production of which of the following? A) additional ATP B) ADP and NADP+ C) ATP and NADPH D) ATP and NADP+ E) oxygen and sugar

9) The cyclic flow of electrons in the light reactions leads to the production of which of the following? A) ATP and NADP+ B) ADP and NADP+ C) ATP and NADPH D) additional ATP E) oxygen and sugar 10) In a typical plant cell, where can ATP synthase be found? A) thylakoid membrane B) plasma membrane C) inner membrane of the mitochondrial membrane D) A and B E) A and C 11) In chloroplasts, in order to build up a proton gradient, protons are pumped A) from the thylakoid into the stroma. B) from the matrix into the stroma. C) from the intermembrane space into to the matrix. D) from the stroma into the thylakoid space. E) from the matrix into the intermembrane space. 12) In mitochondria, in order to build up a proton gradient, protons are pumped A) from the intermembrane space into to the matrix. B) from the matrix into the intermembrane space. C) from the thylakoid into the stroma. D) from the matrix into the stroma. E) from the stroma into the thylakoid space. 13) Chemiosmosis is used to produce ATP during which process(es)? A) respiration B) photosynthesis C) A and B D) none of the above

14) In chloroplasts, the electron transport chain is located A) in the stroma B) in the matrix C) in the cytoplasm D) in the cristae folds E) in the thylakoid membrane 15) The reduction of NADP+ to form NADPH occurs during which process? A) photosynthesis B) respiration C) Both A and B D) none of the above 16) The reduction of oxygen to form water occurs during which process? A) respiration B) photosynthesis C) Both A and B D) none of the above 17) The splitting of carbon dioxide to release oxygen occurs during which process? A) photosynthesis B) respiration C) Both A and B D) none of the above 18) The light reactions produce _________________ while the Calvin cycle produces _______________. A) CO 2 and sugars; ATP and NADPH B) ATP and NADPH; CO 2 and sugars C) Oxygen and electrons; water and CO 2 D) ATP AND NADPH; water and sugars E) none of the above

19) Where are the enzymes involved in photophosphorylation located? A) in the stroma of the chloroplast B) electron transport chain C) in the thylakoid space D) in the thylakoid membranes E) in the outer membrane of the chloroplast 20) Where does carbon fixation take place? A) in the thylakoid space B) in the outer membrane of the chloroplast C) electron transport chain D) in the stroma of the chloroplast E) in the thylakoid membranes 21) The main purpose of the Calvin cycle is to A) form ATP and NADPH B) release carbon dioxide and oxidize NADPH C) make simple sugars from carbon dioxide D) release oxygen from the splitting of water molecules E) release carbon dioxide and produce ATP 22) The main purpose of the light reactions is to A) release oxygen from the splitting of water molecules B) make simple sugars from carbon dioxide C) form ATP and NADPH D) release carbon dioxide and produce ATP E) release carbon dioxide and oxidize NADPH 23) Which of the following options requires ATP? A) light reactions B) Calvin cycle C) A and B D) none of the above

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