Chapter 10

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Chapter 10

  
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1.  Reduction of oxygen which forms water occurs during
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2.  When oxygen is released as a result of photosynthesis, it is a by-product of which of the following?
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3.  P680+ is said to be the strongest biological oxidising agent. Why?
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4.  Carotenoids are often found in foods that are considered to have antioxidant properties in human nutrition. What related function do they have in plants?
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5.  Cyclic electron flow may be photoprotective (protective to light-induced damage). Which of the following experiments could provide information on this phenomenon?
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6.  Requires glucose
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7.  CAM plants keep stomata closed in daytime, thus reducing loss of water. They can do this because they
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8.  In thylakoids, protons travel through ATP synthase from the stroma to the thylakoid space. Therefore the catalytic "knobs" of ATP synthase would be located
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9.  The alternative pathways of photosynthesis using the C4 or CAM systems are said to be compromises. Why?
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10.  Where does the Calvin cycle take place?
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11.  Which of the following statements best describes the relationship between photosynthesis and respiration?
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12.  In a plant cell, where are the ATP synthase complexes located?
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13.  Produces three-carbon sugars
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14.  Which of the events listed below occur in the light reactions of photosynthesis?
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15.  Some photosynthetic organisms contain chloroplasts that lack photosystem II, yet are able to survive. The best way to detect the lack of photosystem II in these organisms would be
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16.  The reaction-center chlorophyll of photosystem I is known as P700 because
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17.  Requires CO2
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18.  Which of the following statements best represents the relationships between the light reactions and the Calvin cycle?
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19.  What are the products of the light reactions that are subsequently used by the Calvin cycle?
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20.  If plant gene alterations cause the plants to be deficient in photorespiration, what would most probably occur?
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21.  The sugar that results from three "turns" of the Calvin cycle is glyceraldehyde-3-phosphate (G3P). Which of the following is a consequence of this?
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22.  Requires ATP 
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23.  Some photosynthetic bacteria (e.g., purple sulfur bacteria) have photosystem I but not II, while others (e.g. cyanobacteria) have both PSI and PSII. Which of the following might this observation imply?
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24.  What is the primary function of the Calvin cycle? 
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25.  Which statement describes the functioning of photosystem II?
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26.  In autotrophic bacteria, where are the enzymes located that can carry on organic synthesis?
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27.  Photorespiration lowers the efficiency of photosynthesis by preventing the formation of
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28.  Where do the enzymatic reactions of the Calvin cycle take place?
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29.  Which of the following are directly associated with photosystem I?
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30.  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?
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31.  What is the relationship between wavelength of light and the quantity of energy per photon?
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32.  Reduction of NADP+ occurs during
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33.  Which of the following are products of the light reactions of photosynthesis that are utilised in the Calvin cycle?
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34.  Generation of proton gradients across membranes occurs during
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35.  Where are the molecules of the electron transport chain found in plant cells?
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36.  Why are C4 plants able to photosynthesise with no apparent photorespiration?
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37.   In the thylakoid membranes, what is the main role of the antenna pigment molecules?
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38.  What are the products of linear photophosphorylation?
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39.  Produces molecular oxygen (O2)
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40.  In mitochondria, chemiosmosis translocates protons from the matrix into the intermembrane space, whereas in chloroplasts, chemiosmosis translocates protons from
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41.  Suppose the interior of the thylakoids of isolated chloroplasts were made acidic and then transferred in the dark to a pH-8 solution. What would be likely to happen?
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42.  A plant has a unique photosynthetic pigment. The leaves of this plant appear to be reddish yellow. What wavelengths of visible light are being absorbed by this pigment?
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43.  In an experiment studying photosynthesis performed during the day, you provide a plant with radioactive carbon (14C) dioxide as a metabolic tracer. The 14C is incorporated first into oxaloacetate. The plant is best characterised as a
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44.  Synthesis of ATP by the chemiosmotic mechanism occurs during
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45.  In any ecosystem, terrestrial or aquatic, what group(s) is (are) always necessary?
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46.  If photosynthesising green algae are provided with CO2 synthesised with heavy oxygen (18O), later analysis will show that all but one of the following compounds produced by the algae contain the 18O label. That one is
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47.  Produces NADH
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48.  The splitting of carbon dioxide to form oxygen gas and carbon compounds occurs during
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49.  What does the chemiosmotic process in chloroplasts involve?
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50.  In a protein complex for the light reaction (a reaction center), energy is transferred from pigment molecule to pigment molecule, to a special chlorophyll a molecule, and eventually to the primary electron acceptor. Why does this occur?
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51.  Produces NADPH
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52.  As a research scientist, you measure the amount of ATP and NADPH consumed by the Calvin cycle in 1 hour. You find 30,000 molecules of ATP consumed, but only 20,000 molecules of NADPH. Where did the extra ATP molecules come from?
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