photosynthesis
20) reduction of NADP+
photosynthesis
33) requires CO2
The calcin cycle alone
53) What wavelength of light is most effective in driving photosynthesis?
420 mm
26) One carbon dioxide molecule reacts in each "turn" of the Calvin cycle. How many turns of the cycle are required for the synthesis of one glucose molecule?
6
36) In an experiment studying photosynthesis performed during the day, you provide a plant with radioactive carbon (14(C) dioxide as a metabolic tracer. The 14C is incorporated first into oxaloacetate. The plant is best characterized as a
A) C4 plant.
25) Which of the following is (are) required in the Calvin cycle?
A) CO2 B) ATP C) RuBP
Organisms that can exist with light as an energy source and an inorganic form of Carbon and other raw materials are called
A) are called photoautotrophs.
38) CAM plants keep stomata closed in daytime, thus reducing loss of water. They can do this because they
A) fix CO2 into organic acids during the night.
23) Where do the enzymatic reactions of the Calvin cycle take place?
A) stroma of the chloroplast
46) Which of the following statements about the light reactions of photosynthesis are true?
A, B, and C are true.
30) produces NADPH
A. light reactions alone
12) What does cyclic electron flow in the chloroplast produce?
ATP
39) Photorespiration lowers the efficiency of photosynthesis by preventing the formation of
B) 3-phosphoglycerate molecules
42) Which of the following sequences correctly represents the flow of electrons during photosynthesis?
B) H2O → NADPH → Calvin cycle
37) Why are C4 plants able to photosynthesize with no apparent photorespiration?
B) They use PEP carboxylase to initially fix CO2.
6) During photosynthesis, visible light has enough energy to .
B) excite electrons
7) In the thylakoid membranes, what is the main role of the antenna pigment molecules?
B) harvest photons and transfer light energy to the reaction-center chlorophyll
8) The reaction-center chlorophyll of photosystem I is known as P700 because.
B) this pigment is best at absorbing light with a wavelength of 700 nm.
3) What is the primary function of the light reactions of photosynthesis?
B) to produce ATP and NADPH
10) 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
B) to test for liberation of O2 in the light.
19) reduction of oxygen which forms water
B. respiration
28) requires ATP
B. the Calvin cycle alone
48) What did Engelmann conclude about the congregation of bacteria in the red and blue areas?
Bacteria congregated in these areas because these areas had the most oxygen being released
32) inactive in the dark
Both light reactions and the calvin cycle
11) What are the products of noncyclic photophosphorylation?
C) ATP and NADPH
9) All of the events listed below occur in the light reactions of photosynthesis except
C) carbon dioxide is incorporated into PGA.
22) generation of proton gradients across membranes
C. both photosynthesis and respiration
41) The light reactions of photosynthesis supply the Calvin cycle with
D) ATP and NADPH.
21) the splitting of carbon dioxide to form oxygen gas and carbon compounds
D. neither photosynthesis nor respiration
29) produces NADH
D. neither the light reactions nor the Calvin cycle
2) Which of the following are products of the light reactions of photosynthesis that are utilized in the Calvin cycle?
E) ATP and NADPH
44) In what respect are the photosynthetic adaptations of C4 plants and CAM plants similar?
In both cases, an enzyme other than rubisco carries out the first step in carbon fixation.
34) requires glucose
Neither light reactions nor the calvin cycle
52) 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
5) A plant 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
45) Which of the following does not occur during the Calvin cycle?
Release of oxygen
40) Carbon fixation involves the addition of carbon dioxide to
RuBP
47) Which statement regarding events in the functioning of photosystem II is false?
The P680 chlorophyll donates a pair of protons to NADPH, which is thus converted to NADP+
18) synthesis of ATP by the chemiosmotic mechanism
both photosynthesis and respiration
35) What are the substrates (normal reactants) for the enzyme RuBP carboxylase?
enzyme RuBP carboxylase?
14) What does the chemiosmotic process in chloroplasts involve?
establishment of a proton gradient
27) produces molecular oxygen (O2)
light reactions alone
43) Cooperation of the two photosystems is required for
reduction of NADP+
4) Where does the Calvin cycle take place?
stroma of the chloroplast
24) What is the primary function of the Calvin cycle?
synthesize simple sugars from carbon dioxide
31) produces three-carbon sugars
the Calvin cycle alone
50) If you ran the same experiment without passing light through a prism, what would you predict?
the bacteria would be relatively evenly distributed along the algal filaments
49) An outcome of this experiment was to help determine
the relationship between wavelengths of light and the oxygen released during photosynthesis
16) In mitochondria, chemiosmosis translocates protons from the matrix into the intermembrane space, whereas in chloroplasts, chemiosmosis translocates protons from
the stroma to the thylakoid space.
13) 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?
the synthesis of ATP
15) In a plant cell, where are the ATP synthase complexes located? (exam only)
thylakoid membrane and inner mitochondrial membrane
17) Where is the electron transport chain found in plant cells?
thylakoid membranes of chloroplasts
