Photosynthesis Quiz 1
1. Protons (H+) accumulate in the thylakoid space during electron transport between photosystems I and II. The excess of protons in the thylakoid space
A. raises the pH of the space until the processes stop.
B. is small enough to diffuse back out through the lipid bilayer.
C. moves from the thylakoid space to the stroma through an ATP synthase complex channel that generates ATP.
D. converts NADP to NADPH and generates ATP in the process.
E. enters the photorespiration pathway.
A. raises the pH of the space until the processes stop.
B. is small enough to diffuse back out through the lipid bilayer.
C. moves from the thylakoid space to the stroma through an ATP synthase complex channel that generates ATP.
D. converts NADP to NADPH and generates ATP in the process.
E. enters the photorespiration pathway.
2. 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.
3. Which of these is NOT a major photosynthetic pigment in plants?
A. chlorophyll a
B. chlorophyll c
C. chlorophyll b
D. All of these are major plant pigments
E. carotenoid pigments
A. chlorophyll a
B. chlorophyll c
C. chlorophyll b
D. All of these are major plant pigments
E. carotenoid pigments
4. Which would be a CAM plant?
A. oak tree
B. corn
C. rice
D. wheat
E. cactus
A. oak tree
B. corn
C. rice
D. wheat
E. cactus
5. G3P (glyceraldehyde 3 phosphate) is used by plants for all of the following EXCEPT the formation of
A. starches
B. oxygen.
C. sucrose.
D. fatty acids.
E. amino acids.
A. starches
B. oxygen.
C. sucrose.
D. fatty acids.
E. amino acids.
6. Why are plants green?
A. They absorb only green wavelengths of light.
B. They reflect green wavelengths of light.
C. They absorb only yellow and blue wavelengths of light.
D. They reflect nearly all wavelengths of light.
E. They reflect yellow and blue wavelengths of light.
A. They absorb only green wavelengths of light.
B. They reflect green wavelengths of light.
C. They absorb only yellow and blue wavelengths of light.
D. They reflect nearly all wavelengths of light.
E. They reflect yellow and blue wavelengths of light.
7. Photosynthetic pigments
A. include chlorophyll a, b, and the carotenoids.
B. All of the choices are correct.
C. can have their absorption spectra analyzed using a spectrophotometer.
D. absorb specific wavelengths of light in their absorption spectra.
E. reflect certain wavelengths of light
A. include chlorophyll a, b, and the carotenoids.
B. All of the choices are correct.
C. can have their absorption spectra analyzed using a spectrophotometer.
D. absorb specific wavelengths of light in their absorption spectra.
E. reflect certain wavelengths of light
8. The end product of the Calvin cycle is
A. carbon dioxide.
B. ribulose bisphosphate (RuBP).
C. glyceraldehyde-3-phospate (G3P).
D. PEP carboxylase (PEPcase).
E. ATP.
A. carbon dioxide.
B. ribulose bisphosphate (RuBP).
C. glyceraldehyde-3-phospate (G3P).
D. PEP carboxylase (PEPcase).
E. ATP.
9. What are the products of photosynthesis?
A. oxygen and carbohydrate
B. NAD and glucose
C. carbohydrate and water
D. water and carbon dioxide
E. water and oxygen
A. oxygen and carbohydrate
B. NAD and glucose
C. carbohydrate and water
D. water and carbon dioxide
E. water and oxygen
10. 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 other five G3P molecules are used to regenerate more RuBP.
B. The remaining five G3P molecules are used to reduce CO2.
C. The remaining carbon is used to make more sugars.
D. Any unused G3P molecule is converted and stored as starch.
E. Any unused CO2 is released into the environment.
A. The other five G3P molecules are used to regenerate more RuBP.
B. The remaining five G3P molecules are used to reduce CO2.
C. The remaining carbon is used to make more sugars.
D. Any unused G3P molecule is converted and stored as starch.
E. Any unused CO2 is released into the environment.
11. 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. The first CO2 fixation product in a C4 plant is oxaloacetate.
D. C3 plants are more successful in mild climates than C4 plants.
E. C4 plants contain chloroplasts in their mesophyll cells.
A. C3 plants fix CO2 in the mesophyll cells.
B. C3 plants make glucose in the bundle sheath cells.
C. The first CO2 fixation product in a C4 plant is oxaloacetate.
D. C3 plants are more successful in mild climates than C4 plants.
E. C4 plants contain chloroplasts in their mesophyll cells.
12. Reduced carbon dioxide is one of the endproducts shown in diagram. The other end product, labeled "b" must be
A. oxygen gas
B. water
C. more carbon dioxide
D. ATP
E. NADPH
A. oxygen gas
B. water
C. more carbon dioxide
D. ATP
E. NADPH
13. Which statement is NOT true of the set of reactions labeled "d"?
A. The process must occur in the presence of light.
B. They are referred to as the Calvin Cycle.
C. The process takes place in the stroma.
D. Carbon dioxide is "fixed" during the process.
E. Most carbon is converted into RuBP.
A. The process must occur in the presence of light.
B. They are referred to as the Calvin Cycle.
C. The process takes place in the stroma.
D. Carbon dioxide is "fixed" during the process.
E. Most carbon is converted into RuBP.
14. Which is NOT true about photosynthesis?
A. More carbohydrate is produced during cyclic photophosphorylation than during noncyclic photophosphorylation.
B. In noncyclic photophosphorylation, water is split and oxygen is released.
C. The cyclic system is used when there is insufficient NADP+ present to absorb electrons in plant cells.
D. Both cyclic and noncyclic photophosphorylation involve and electron transport chain.
E. Photosystem II makes noncyclic photophosphorylation more efficient than does cyclic photophosphorylation.
A. More carbohydrate is produced during cyclic photophosphorylation than during noncyclic photophosphorylation.
B. In noncyclic photophosphorylation, water is split and oxygen is released.
C. The cyclic system is used when there is insufficient NADP+ present to absorb electrons in plant cells.
D. Both cyclic and noncyclic photophosphorylation involve and electron transport chain.
E. Photosystem II makes noncyclic photophosphorylation more efficient than does cyclic photophosphorylation.
15. Photorespiration is a form of
A. None of the above
B. release of carbon dioxide in C4 plants.
C. fixation of carbon dioxide in C3 plants.
D. release of carbon dioxide in C3 plants.
E. fixation of carbon dioxide in C4 plants.
A. None of the above
B. release of carbon dioxide in C4 plants.
C. fixation of carbon dioxide in C3 plants.
D. release of carbon dioxide in C3 plants.
E. fixation of carbon dioxide in C4 plants.
16. Which statement is NOT true about the cyclic electron pathway?
A. Electrons lost from Photosystem I eventually return to Photosystem I.
B. It involves Photosystem I.
C. Electrons from Photosystem I go through an electron transport chain.
D. It produces ATP.
E. It produces NADPH.
A. Electrons lost from Photosystem I eventually return to Photosystem I.
B. It involves Photosystem I.
C. Electrons from Photosystem I go through an electron transport chain.
D. It produces ATP.
E. It produces NADPH.
17. 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. exactly inverted from the action spectrum with a peak for yellow/green
B. a descending line because ultra-violet has more energy than infra-red
C. just like the action spectrum with peaks at violet/blue and orange/red and a trough at yellow/green
D. There is no way to guess without actually running the experiment.
E. perfectly flat because many wavelengths are used by chlorophyll
A. exactly inverted from the action spectrum with a peak for yellow/green
B. a descending line because ultra-violet has more energy than infra-red
C. just like the action spectrum with peaks at violet/blue and orange/red and a trough at yellow/green
D. There is no way to guess without actually running the experiment.
E. perfectly flat because many wavelengths are used by chlorophyll
18. 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. All of the choices are correct.
E. is a reaction assisted by large quantities of RuBP carboxylase enzyme.
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. All of the choices are correct.
E. is a reaction assisted by large quantities of RuBP carboxylase enzyme.
19. Which is most closely associated with the Calvin cycle?
A. carbon dioxide production
B. carbon dioxide fixation
C. oxygen production
D. removal of electrons from water for passage through an electron transport system
E. ATP production
A. carbon dioxide production
B. carbon dioxide fixation
C. oxygen production
D. removal of electrons from water for passage through an electron transport system
E. ATP production
20. The major enzyme that catalyzes the reduction of carbon dioxide is called
A. glyceraldehyde-3-phospate (G3P).
B. PEP carboxylase (PEPcase).
C. ribulose bisphosphate carboxylase (rubisco).
D. ATPase
E. carbonic anhydrase
A. glyceraldehyde-3-phospate (G3P).
B. PEP carboxylase (PEPcase).
C. ribulose bisphosphate carboxylase (rubisco).
D. ATPase
E. carbonic anhydrase
