PHOTOSYNTHESIS REVIEW
1Plants 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: CAM plants
2Photorespiration lowers the efficiency of photosynthesis by removing which of the following from the Calvin cycle? ribulose bisphosphate molecules
3 Chloroplasts can make carbohydrate in the dark if provided with ATP, NADPH and CO2
Refer to the processes given below to answer the following question(s), indicating the pathway(s) in which they occur. Each pathway may be used once, more than once, or not at all.
1. respiration only
2. photosynthesis only
3. both respiration and photosynthesis
4. neither respiration nor photosynthesis
4 Chemiosmotic synthesis of ATP.3
5 Reduction of CO2.2
6Reduction of NADP+. 2
7 Oxidation of water2
8 Electron flow along a cytochrome chain. 3
9DAssume a thylakoid is somehow punctured so that the interiors of the thylakoids are no longer separated from the stroma. This damage will have the most direct effect on the synthesis of ATP
10 Why are C4 plants able to photosynthesize with no apparent photorespiration? They use a more efficient enzyme to initially fix CO2.
11 Figure 10.1 shows the absorption spectrum for chlorophyll a and the action spectrum for photosynthesis. Why are they different? Other pigments absorb light in addition to chlorophyll a.
12 Which of the following statements about the light reactions of photosynthesis is True? The splitting of water molecules provides a source of electrons . Chlorophyll (and other pigments) absorb light energy which excites electrons. An electron transport chain is used to create a proton gradient. ) Some electrons are recycled and some are not.
13 The following are products of the Calvin cycle and are utilized in the light reactions of photosynthesis? ADP, Pi, and NADP+
14From the photosynthetic action spectrum in Figure 10.2, we cancorrectly conclude that plants can use all colors of visible light for photosynthesis.
15 The primary function of the light reactions of photosynthesis is to produce energy rich ATP and NADPH.
16 The reactions of the Calvin cycle require all of the following molecules CO2. ATP. RuBP. . NADPH+.
17 All of the following statements are true ..Thylakoid membranes contain the photosynthetic pigments. The O2 released during photosynthesis comes from water. The light reactions of photosynthesis provide the energy for the Calvin cycle. When chlorophyll is reduced, it gains electrons.
18 You have just discovered a new flower species that has a unique photosynthetic pigment. The leaves of this plant appear to be reddish yellow. What wavelengths of visible light are not being absorbed by this pigment? red and yellow
19 All of the events listed below occur in the energy-capturing "light-reactions" of photosynthesis Oxygen is produced. NADP is reduced to NADPH+. ADP is phosphorylated to yield ATP. Light is absorbed.
20The chemiosomotic process in chloroplasts involves theestablishment of a proton gradient.
21Which of the following enzymes is probably the most abundant protein in the world? RuBP carboxylase
22The statements Are true of the carbon-fixing reactions of the Calvin cycle?..Three turns produce one molecule of glyceraldehyde... Each step requires an enzyme.... The synthesis of one glucose molecule requires 18 ATP and 12
NADPH... Ribulose bisphosphate is regenerated after each turn of the cycle.
23In C4 photosynthesis, carbon fixation takes place in the mesophyll cells, and then is transferred as malic or aspartic acid to bundle sheath cells where carbon dioxide is released for entry into the Calvin cycle.
24 Because bundle sheath cells are relatively protected from atmospheric oxygen, the level of photorespiration is held to a minimum in C4 plants.
25the following events are in the functioning of photosystem II . Light energy excites electrons in an antenna pigment in a photosynthetic unit... The excitation is passed along to a molecule of P680 chlorophyll in the photosynthetic unit... The electron vacancies in P680 are filled by electrons derived from water.. The spitting of water yields molecular oxygen as a by-product.
26All of the following compounds are required (i.e., are necessary \F constituents for chemical reactions) at some stage of green plant photosynthesis, EXCEPT oxygen.
27When a chlorophyll molecule in photosystem I traps light, it loses an electron. In noncyclic electron flow this electron is replaced by a donation from photosystem II.
28On which of the following features do plant and animal cells differ?. primary energy source
29Which of the following is not true of ribulose bisphosphatecarboxylase? It catalyzes a phosphorylation reaction.
30Where do the light-independent reactions of photosynthesis takeplace? stroma of the chloroplast
31CAM plants can keep stomates closed in daytime, thus reducing loss of water. They can do this because they can fix CO2 into organic acids during the night.
32The color of light least effective in driving photosynthesis is. green.
33Cyclic electron flow in the chloroplast producesATP.
34In plant cells, ATP is made in response to light. An electron transport chain is involved. This electron transport chain is found in the thylakoid membranes of chloroplasts.
35If 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 exception is O2.
36The process of noncyclic photophosphorylation uses light energy tosynthesize ATP and NADPH.
37Members of the Crassulaceae differ from C4 plants in that they incorporate carbon dioxide into organic acids at night.
38 Photosynthesis stores energy in complex organic molecules and respiration releases it.
39 In a plant cell, where is ATP synthase located? thylakoid membrane and inner mitochondrial membrane
Refer to the choices below to answer the following question(s). Each choice may be used once, more than once, or not at all. Indicate whether the following events occur during:
1. photosynthesis
2. respiration
3. both photosynthesis and respiration
4. neither photosynthesis nor respiration
40Synthesis of ATP by the chemiosmotic mechanism.3
41Oxidation of water. 1
42Reduction of NADP+.1
43CO2 fixation1
44Electron flow along a cytochrome chain.3
45Oxidative phosphorylation.2
46Generation of proton gradients across membranes. 3
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