Campbell s Biology 9e Reece et al Chapter 10 Photosynthesis Students find this chapter quite challenging Fortunately some of the key concepts such as chemiosmosis and redox were discussed previously in the chapter on respiration and fermentation The new key concepts are light as energy light absorption and energy conversion by pigments and linear and cyclic electron flow Students are challenged to identify the relationships between the light reactions and the Calvin cycle as well as the adaptive significance of C4 and CAM pathways Comparison and contrast between photosynthesis and respiration the significance of photosynthesis to Earth history and evolution of life and the role of photosynthesis in global carbon cycles and environmental change are important topics to engage students Multiple Choice Questions 1 If photosynthesizing green algae are provided with CO2 synthesized 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 A 3 phosphoglycerate B glyceraldehyde 3 phosphate G3P C glucose D ribulose bisphosphate RuBP E O2 Answer E Topic Concept 10 1 Skill Application Analysis 2 Which of the following are products of the light reactions of photosynthesis that are utilized in the Calvin cycle A CO2 and glucose B H2O and O2 C ADP i and NADP D electrons and H E ATP and NADPH Answer E Topic Concept 10 1 Skill Knowledge Comprehension 3 Photosynthesis is not responsible for A oxygen in the atmosphere B the ozone layer C most of the organic carbon on Earth s surface D atmospheric CO2 E fossil fuels Answer E Topic Concept 10 1 Skill Knowledge Comprehension 1 Copyright 2011 Pearson Education Inc 4 Where does the Calvin cycle take place A stroma of the chloroplast B thylakoid membrane C cytoplasm surrounding the chloroplast D interior of the thylakoid thylakoid space E outer membrane of the chloroplast Answer A Topic Concept 10 1 Skill Knowledge Comprehension 5 In any ecosystem terrestrial or aquatic what group s is are always necessary A autotrophs and heterotrophs B producers and primary consumers C photosynthesizers D autotrophs E green plants Answer D Topic Concept 10 1 Skill Synthesis Evaluation 6 In autotrophic bacteria where are the enzymes located that can carry on carbon fixation reduction of carbon dioxide to carbohydrate A in chloroplast membranes B in chloroplast stroma C in the cytosol D in the nucleoid E in the infolded plasma membrane Answer C Topic Concept 10 1 Skill Application Analysis 7 When oxygen is released as a result of photosynthesis it is a direct by product of A reducing NADP B splitting water molecules C chemiosmosis D the electron transfer system of photosystem I E the electron transfer system of photosystem II Answer B Topic Concept 10 1 Skill Knowledge Comprehension 2 Copyright 2011 Pearson Education Inc 8 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 A red and yellow B blue and violet C green and yellow D blue green and red E green blue and yellow Answer B Topic Concept 10 2 Skill Application Analysis 9 Halobacterium has a photosynthetic membrane that is colored purple Its photosynthetic action spectrum is exactly complementary opposite to the action spectrum for green plants What wavelengths of light do the Halobacterium photosynthetic pigments absorb A red and yellow B blue green and red C green and yellow D red and green E blue and red Answer E Topic Concept 10 2 Skill Synthesis Evaluation 10 In the thylakoid membranes what is the main role of the antenna pigment molecules A split water and release oxygen to the reaction center chlorophyll B harvest photons and transfer light energy to the reaction center chlorophyll C synthesize ATP from ADP and i D transfer electrons to ferredoxin and then NADPH E concentrate photons within the stroma Answer B Topic Concept 10 2 Skill Knowledge Comprehension 11 Which of the events listed below occurs in the light reactions of photosynthesis A NADP is produced B NADPH is reduced to NADP C Carbon dioxide is incorporated into PGA D ATP is phosphorylated to yield ADP E Light is absorbed and funneled to reaction center chlorophyll a Answer E Topic Concept 10 2 Skill Knowledge Comprehension 3 Copyright 2011 Pearson Education Inc 12 Which statement describes the functioning of photosystem II A Light energy excites electrons in the thylakoid membrane electron transport chain B Photons are passed along to a reaction center chlorophyll C The P680 chlorophyll donates a pair of protons to NADP which is thus converted to NADPH D The electron vacancies in P680 are filled by electrons derived from water E The splitting of water yields molecular carbon dioxide as a by product Answer D Topic Concept 10 2 Skill Knowledge Comprehension 13 Which of the following are directly associated with photosystem I A harvesting of light energy by ATP B receiving electrons from the thylakoid membrane electron transport chain C generation of molecular oxygen D extraction of hydrogen electrons from the splitting of water E passing electrons to the thylakoid membrane electron transport chain Answer B Topic Concept 10 2 Skill Knowledge Comprehension 14 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 A to determine if they have thylakoids in the chloroplasts B to test for liberation of O2 in the light C to test for CO2 fixation in the dark D to do experiments to generate an action spectrum E to test for production of either sucrose or starch Answer B Topic Concept 10 2 Skill Application Analysis 15 What are the products of linear photophosphorylation A heat and fluorescence B ATP and P700 C ATP and NADPH D ADP and NADP E P700 and P680 Answer C Topic Concept 10 2 Skill Knowledge Comprehension 4 Copyright 2011 Pearson Education Inc 16 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 A photosystem II B photosystem I C cyclic electron flow D linear electron flow E chlorophyll Answer C Topic Concept 10 2 Skill Application Analysis 17 Assume a thylakoid is somehow punctured so that the interior of the thylakoid is no longer separated from the stroma