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
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
5 Reduction of CO2.2
7 Oxidation of water2
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
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.
13 The following are products of the Calvin cycle and are utilized in the light reactions of photosynthesis? ADP, Pi, and NADP+
15 The primary function of the light reactions of photosynthesis is to produce energy rich ATP and 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.
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.
21Which of the following enzymes is probably the most abundant protein in the world? RuBP carboxylase
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.
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.
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.
29Which of the following is not true of ribulose bisphosphatecarboxylase? It catalyzes a phosphorylation reaction.
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.
33Cyclic electron flow in the chloroplast producesATP.
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.
37Members of the Crassulaceae differ from C4 plants in that they incorporate carbon dioxide into organic acids at night.
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
41Oxidation of water. 1
43CO2 fixation1
45Oxidative phosphorylation.2
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