1. Which statement is NOT true about the cyclic electron pathway?
A. It produces NADPH.
B. It produces ATP.
C. Electrons lost from Photosystem I eventually return to Photosystem I.
D. It involves Photosystem I.
E. Electrons from Photosystem I go through an electron transport chain.
A. It produces NADPH.
B. It produces ATP.
C. Electrons lost from Photosystem I eventually return to Photosystem I.
D. It involves Photosystem I.
E. Electrons from Photosystem I go through an electron transport chain.
2. The Calvin cycle requires all of the following except _____________ to occur.
A. light
B. ribulose bi-phosphate
C. RuBP carboxylase
D. carbon dioxide
E. ATP, NADPH
A. light
B. ribulose bi-phosphate
C. RuBP carboxylase
D. carbon dioxide
E. ATP, NADPH
3. What organisms are capable of photosynthesis?
A. plants only
B. plants and some bacteria only
C. plants, algae and fungi
D. plants, algae, and some bacteria
E. plants and algae only
A. plants only
B. plants and some bacteria only
C. plants, algae and fungi
D. plants, algae, and some bacteria
E. plants and algae only
4. Which would be a CAM plant?
A. rice
B. corn
C. cactus
D. oak tree
E. wheat
A. rice
B. corn
C. cactus
D. oak tree
E. wheat
5. When the stomata in a leaf close, then
A. C3 plants carry on photorespiration, using O2 and producing PGA and CO2.
B. carbon dioxide in the air spaces in the leaf decreases.
C. All choices are correct
D. all photosystems can continue to work.
E. oxygen in the air spaces in the leaf increases.
A. C3 plants carry on photorespiration, using O2 and producing PGA and CO2.
B. carbon dioxide in the air spaces in the leaf decreases.
C. All choices are correct
D. all photosystems can continue to work.
E. oxygen in the air spaces in the leaf increases.
6. Which statement is NOT true about the noncyclic electron pathway?
A. It produces carbohydrates through carbon dioxide fixation.
B. It produces NADPH.
C. Electrons are boosted to higher energy level in Photosystem I.
D. It produces ATP.
E. Sunlight excites electrons in Photosystem II.
A. It produces carbohydrates through carbon dioxide fixation.
B. It produces NADPH.
C. Electrons are boosted to higher energy level in Photosystem I.
D. It produces ATP.
E. Sunlight excites electrons in Photosystem II.
7. What are the products of photosynthesis?
A. NAD and glucose
B. water and oxygen
C. carbohydrate and water
D. water and carbon dioxide
E. oxygen and carbohydrate
A. NAD and glucose
B. water and oxygen
C. carbohydrate and water
D. water and carbon dioxide
E. oxygen and carbohydrate
8. What is not true of chlorophyll and other accessory pigments in plants?
A. Chlorophyll provides electrons that will be used to produce ATP.
B. Chlorophyll is packed in thylakoid membranes.
C. Chlorophyll provides the enzymes needed to produce carbohydrates.
D. Plant pigments absorb solar energy.
E. Chlorophyll absorbs light of specific wavelengths.
A. Chlorophyll provides electrons that will be used to produce ATP.
B. Chlorophyll is packed in thylakoid membranes.
C. Chlorophyll provides the enzymes needed to produce carbohydrates.
D. Plant pigments absorb solar energy.
E. Chlorophyll absorbs light of specific wavelengths.
9. Which of these is NOT a major photosynthetic pigment in plants?
A. chlorophyll c
B. chlorophyll b
C. carotenoid pigments
D. All of these are major plant pigments
E. chlorophyll a
A. chlorophyll c
B. chlorophyll b
C. carotenoid pigments
D. All of these are major plant pigments
E. chlorophyll a
10. Although it is not possible to be exact about when cyanobacteria first appeared on earth, most scientists agree that about two billion years ago, they expanded rapidly and raised the oxygen in the earth's atmosphere to present levels in about 500 million years. This appearance of oxygen and the beginning of aerobic life was made possible by the appearance of
A. fermentation.
B. Photosystem II.
C. the nucleus.
D. ATP hydrolysis.
E. Photosystem I.
A. fermentation.
B. Photosystem II.
C. the nucleus.
D. ATP hydrolysis.
E. Photosystem I.
11. The major enzyme that catalyzes the reduction of carbon dioxide is called
A. PEP carboxylase (PEPcase).
B. carbonic anhydrase
C. ribulose bisphosphate carboxylase (rubisco).
D. glyceraldehyde-3-phospate (G3P).
E. ATPase
A. PEP carboxylase (PEPcase).
B. carbonic anhydrase
C. ribulose bisphosphate carboxylase (rubisco).
D. glyceraldehyde-3-phospate (G3P).
E. ATPase
12. Which is most closely associated with the Calvin cycle?
A. ATP production
B. oxygen production
C. removal of electrons from water for passage through an electron transport system
D. carbon dioxide fixation
E. carbon dioxide production
A. ATP production
B. oxygen production
C. removal of electrons from water for passage through an electron transport system
D. carbon dioxide fixation
E. carbon dioxide production
13. Photorespiration is a form of
A. release of carbon dioxide in C4 plants.
B. fixation of carbon dioxide in C3 plants.
C. release of carbon dioxide in C3 plants.
D. None of the above
E. fixation of carbon dioxide in C4 plants.
A. release of carbon dioxide in C4 plants.
B. fixation of carbon dioxide in C3 plants.
C. release of carbon dioxide in C3 plants.
D. None of the above
E. fixation of carbon dioxide in C4 plants.
14. The end product of the Calvin cycle is
A. ribulose bisphosphate (RuBP).
B. glyceraldehyde-3-phospate (G3P).
C. carbon dioxide.
D. ATP.
E. PEP carboxylase (PEPcase).
A. ribulose bisphosphate (RuBP).
B. glyceraldehyde-3-phospate (G3P).
C. carbon dioxide.
D. ATP.
E. PEP carboxylase (PEPcase).
15. C4 plants
A. have a net photosynthetic rate two to three times that of C3 plants.
B. All of these are correct
C. are found in hot dry climates.
D. store carbon dioxide temporarily as oxaloacetate.
E. Lose less carbon to photorespiration
A. have a net photosynthetic rate two to three times that of C3 plants.
B. All of these are correct
C. are found in hot dry climates.
D. store carbon dioxide temporarily as oxaloacetate.
E. Lose less carbon to photorespiration
16. Which statement is NOT true about C3 and C4 plants?
A. C3 plants fix CO2 in the mesophyll cells.
B. C3 plants make glucose in the bundle sheath cells.
C. C4 plants contain chloroplasts in their mesophyll cells.
D. The first CO2 fixation product in a C4 plant is oxaloacetate.
E. C3 plants are more successful in mild climates than C4 plants.
A. C3 plants fix CO2 in the mesophyll cells.
B. C3 plants make glucose in the bundle sheath cells.
C. C4 plants contain chloroplasts in their mesophyll cells.
D. The first CO2 fixation product in a C4 plant is oxaloacetate.
E. C3 plants are more successful in mild climates than C4 plants.
17. Protons (H+) accumulate in the thylakoid space during electron transport between photosystems I and II. The excess of protons in the thylakoid space
A. enters the photorespiration pathway.
B. converts NADP to NADPH and generates ATP in the process.
C. moves from the thylakoid space to the stroma through an ATP synthase complex channel that generates ATP.
D. raises the pH of the space until the processes stop.
E. is small enough to diffuse back out through the lipid bilayer.
A. enters the photorespiration pathway.
B. converts NADP to NADPH and generates ATP in the process.
C. moves from the thylakoid space to the stroma through an ATP synthase complex channel that generates ATP.
D. raises the pH of the space until the processes stop.
E. is small enough to diffuse back out through the lipid bilayer.
18. G3P (glyceraldehyde 3 phosphate) is used by plants for all of the following EXCEPT the formation of
A. fatty acids.
B. sucrose.
C. oxygen.
D. amino acids.
E. starches
A. fatty acids.
B. sucrose.
C. oxygen.
D. amino acids.
E. starches
19. Which is NOT true about photosynthesis?
A. Both cyclic and noncyclic photophosphorylation involve and electron transport chain.
B. The cyclic system is used when there is insufficient NADP+ present to absorb electrons in plant cells.
C. In noncyclic photophosphorylation, water is split and oxygen is released.
D. Photosystem II makes noncyclic photophosphorylation more efficient than does cyclic photophosphorylation.
E. More carbohydrate is produced during cyclic photophosphorylation than during noncyclic photophosphorylation.
A. Both cyclic and noncyclic photophosphorylation involve and electron transport chain.
B. The cyclic system is used when there is insufficient NADP+ present to absorb electrons in plant cells.
C. In noncyclic photophosphorylation, water is split and oxygen is released.
D. Photosystem II makes noncyclic photophosphorylation more efficient than does cyclic photophosphorylation.
E. More carbohydrate is produced during cyclic photophosphorylation than during noncyclic photophosphorylation.
20. The action spectrum of photosynthesis shows a high light absorption for violet/blue and orange/red and a low absorption for green/yellow. If we were to set up an experiment where narrow bands of unicolored light were shown on an aquatic plant such as Elodea, and we counted the number of bubbles of oxygen produced as an indicator of photosynthetic rate, how would the graph appear?
A. a descending line because ultra-violet has more energy than infra-red
B. just like the action spectrum with peaks at violet/blue and orange/red and a trough at yellow/green
C. perfectly flat because many wavelengths are used by chlorophyll
D. There is no way to guess without actually running the experiment.
E. exactly inverted from the action spectrum with a peak for yellow/green
A. a descending line because ultra-violet has more energy than infra-red
B. just like the action spectrum with peaks at violet/blue and orange/red and a trough at yellow/green
C. perfectly flat because many wavelengths are used by chlorophyll
D. There is no way to guess without actually running the experiment.
E. exactly inverted from the action spectrum with a peak for yellow/green
21. Which statement is NOT true about photosystems?
A. Photosystem I passes electrons on to Photosystem II.
B. Each photosystem contains numerous pigment molecules that act as antennas to capture light.
C. Electrons in the reaction center molecule are excited by absorbed solar energy and are passed along to an acceptor molecule.
D. Photosystem II contains a reaction center molecule that loses electrons which are then replaced by electrons from water.
E. Photosystem I receives electrons from photosystem II
A. Photosystem I passes electrons on to Photosystem II.
B. Each photosystem contains numerous pigment molecules that act as antennas to capture light.
C. Electrons in the reaction center molecule are excited by absorbed solar energy and are passed along to an acceptor molecule.
D. Photosystem II contains a reaction center molecule that loses electrons which are then replaced by electrons from water.
E. Photosystem I receives electrons from photosystem II
22. Reduced carbon dioxide is one of the endproducts shown in diagram. The other end product, labeled "b" must be
A. NADPH
B. oxygen gas
C. water
D. ATP
E. more carbon dioxide
A. NADPH
B. oxygen gas
C. water
D. ATP
E. more carbon dioxide
23. Which statement is NOT true of the set of reactions labeled "d"?
A. They are referred to as the Calvin Cycle.
B. The process must occur in the presence of light.
C. Most carbon is converted into RuBP.
D. The process takes place in the stroma.
E. Carbon dioxide is "fixed" during the process.
A. They are referred to as the Calvin Cycle.
B. The process must occur in the presence of light.
C. Most carbon is converted into RuBP.
D. The process takes place in the stroma.
E. Carbon dioxide is "fixed" during the process.
24. The first event in the Calvin cycle is the attachment of carbon dioxide to the five-carbon RuBP molecule, which
A. occurs in the stroma of the chloroplasst
B. forms a six-carbon molecule that immediately breaks down into two three-carbon PGA molecules.
C. decreases cell carbon dioxide levels, which increases the diffusion gradient.
D. is a reaction assisted by large quantities of RuBP carboxylase enzyme.
E. All of the choices are correct.
A. occurs in the stroma of the chloroplasst
B. forms a six-carbon molecule that immediately breaks down into two three-carbon PGA molecules.
C. decreases cell carbon dioxide levels, which increases the diffusion gradient.
D. is a reaction assisted by large quantities of RuBP carboxylase enzyme.
E. All of the choices are correct.
25. If the Calvin cycle uses three molecules of CO2 to produce six molecules of G3P (glyceraldehydes-3-phosphate), but only one G3P molecule is used to form a carbohydrate molecule, what happens to the other carbons that were taken in?
A. The remaining five G3P molecules are used to reduce CO2.
B. Any unused CO2 is released into the environment.
C. The remaining carbon is used to make more sugars.
D. The other five G3P molecules are used to regenerate more RuBP.
E. Any unused G3P molecule is converted and stored as starch.
A. The remaining five G3P molecules are used to reduce CO2.
B. Any unused CO2 is released into the environment.
C. The remaining carbon is used to make more sugars.
D. The other five G3P molecules are used to regenerate more RuBP.
E. Any unused G3P molecule is converted and stored as starch.
26. Photosynthetic pigments
A. reflect certain wavelengths of light
B. absorb specific wavelengths of light in their absorption spectra.
C. include chlorophyll a, b, and the carotenoids.
D. All of the choices are correct.
E. can have their absorption spectra analyzed using a spectrophotometer.
A. reflect certain wavelengths of light
B. absorb specific wavelengths of light in their absorption spectra.
C. include chlorophyll a, b, and the carotenoids.
D. All of the choices are correct.
E. can have their absorption spectra analyzed using a spectrophotometer.
27. Why are plants green?
A. They absorb only green wavelengths of light.
B. They reflect green wavelengths of light.
C. They reflect yellow and blue wavelengths of light.
D. They reflect nearly all wavelengths of light.
E. They absorb only yellow and blue wavelengths of light.
A. They absorb only green wavelengths of light.
B. They reflect green wavelengths of light.
C. They reflect yellow and blue wavelengths of light.
D. They reflect nearly all wavelengths of light.
E. They absorb only yellow and blue wavelengths of light.
1. A
2. A
3. D
4. C
5. C
6. A
7. E
8. C
9. A
10. B
11. C
12. D
13. C
14. B
15. B
16. B
17. C
18. C
19. E
20. B
21. A
22. B
23. B
24. E
25. D
26. D
27. B
