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Photosynthesis
Introduction to Photosynthesis
Topic Self-Quiz
1.In the following reaction what does C6H12O6 represent?
6CO2 +12H2O +light energy —>C6H12O6 +6O2 +6H2O
a) glucose
b) stored chemical energy
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c) sugar
d) all of the above
answer
2. In the following reaction what process happens to CO2?
6CO2 +12H2O +light energy —>C6H12O6 +6O2 +6H2O
a) oxidation
b) reduction
T c) condensation
answer
d) polymerization
3. In the following reaction what can happen next to C6H12O6?
6CO2 +12H2O +light energy —>C6H12O6 +6O2 +6H2O
a) broken down by cellular respiration
T b) stored as starch
c) exported to other parts of the organism
d) all of the above
answer
4. Carbon fixation binds:
a) carbon to water
T b) carbon to O2
c) CO2 to water
d) carbon to organic molecules
answer
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Photosynthesis
Chloroplast Structure
Topic Self-Quiz
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1. The _______ take place in the fluid matrix of the stroma.
a) light reactions of photosynthesis
T b) glycolysis reactions
c) cellular respiration reactions
d) carbon fixation reactions
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2. Identify the following parts of a chloroplast:
a) grana
G b) stroma
c) thylakoid
d) outer membrane
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3. Identify the following parts of the underside of a leaf:
a) stomata
G b) guard cells
c) pore
d) chloroplasts
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Photosynthesis
Light Trapping by Chloroplasts
Topic Self-Quiz
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1. Which of the following interact directly with light in photosynthesis?
a) primary electron acceptor
T b) NADPH
c) H20
answer
d) carotenoid molecule
2. When humans see an object they see ________ light from the object.
a) absorbed
T b) reflected
c) refracted
answer
d) converted
3. An absorption spectrum is a plot of pigment absorption versus wavelength. An action spectrum is a plot of the
rate of photosynthesis in a plant (measured as output of O2) versus wavelength. How can the action spectrum for a
plant be different than the absorption spectrum for chlorophyll a?
a) chlorophyll changes its absorption in different lighting
G b) other pigments absorb light of different wavelenghts which is harvested by the antenna complex
c) plants can spontaneously change their rate of O2 generation
d) O2 production by a plant has no relation to light absorption in chlorophyll
answer
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Photosynthesis
Light Dependent Reactions/'
Topic Self-Quiz
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1. The light-dependent reactions involve which of the following protein-pigment complexes:
a) Photosystem 1
T b) Photosystem 1 and 2
c) Calvin cycle
answer
d) Photosystem 2
2. In non-cyclic electron flow, the electron from water effectively ends up:
a) back in the water molecule
G b) in the O2 molecule
c) in the molecule of NADPH
answer
d) in the chlorophyll of Photosystem 2
3. The difference between cyclic and non-cyclic electron flow is:
a) cyclic electron flow harvests more energy for each excited electron
T b) cyclic electron flow generates more oxygen
c) cyclic electron flow generates more NAPH
d) cyclic electron flow provides ATP needed to compensate for its higher use in the Calvin cycle
answer
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Photosynthesis
Light Dependent Reactions/(
Topic Self-Quiz
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1. The potential energy of electrons in the light-dependent reactions reaches it highest level:
a) at ferredoxin
G b) when the chlorophyll of photosystem 2 is excited by light energy
c) at the primary electron acceptor of photosystem 1
answer
2. In non-cyclic electron flow, the electron from the P680 reaction center effectively ends up:
a) back in the water molecule
G b) in the O2 molecule
c) in the molecule of NADPH
d) in the chlorophyll of Photosystem 2
answer
3. Cyclic and non-cyclic photophosphorylation are similar because, in both:
a) excited electrons return to the P700 chlorophyll reaction center
G b) ATP is synthesized by harvesting a H+ ion gradient (concentration higer outside the thylakoid than inside)
c) ATP is synthesized by harvesting a H+ ion gradient (concentration higher inside the thylakoid than outside)
d) ATP synthesis is directly linked to a redox reaction at cytochrome
answer
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Photosynthesis
Light Independent Reactions/'
Topic Self-Quiz
1. The Calvin cycle:
a) turns carbon dioxide into sugars by oxidizing certain intermediates
T b) makes sugars by breaking down an enzyme, rubisco
c) converts light energy directly into sugars
d) converts energy from energy carrier molecules into chemical bond energy in sugars
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answer
2. Every cycle of the Calvin cycle uses up 9 ATP molecules and 6 NADPH molecules. To make the sugar, glucose, requires _______ ATP and _______ NADPH.
a) 9, 6
G b) 27, 18
c) 54, 36
answer
d) 18, 12
3. Every cycle of the Calvin cycle uses up 9 ATP molecules and 6 NADPH molecules, but non-cyclic photophosphorylation makes equal quantities of ATP and NADPH. Where does the ‘extra’ ATP come from?
a) the mitochondrion
b) cyclic photophosphorylation
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c) photorespiration
answer
d) glycolysis
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Photosynthesis
Light Independent Reactions/(
Topic Self-Quiz
1. Which of the following is NOT made directly from PGAL?
a) glucose
b) sucrose
G c) rubisco
d) starch
e) ribulose biphosphate
answer
2. Why does the Calvin cycle tend to slow down or stop at night?
a) it can’t take place in the dark
T b) there is too much oxygen in a plant leaf at night
c) ATP and NADPH are in short supply
d) carbon dioxide is in short supply at night
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3. Oxygen must be constantly removed from plant leaves because:
a) it results in too many sugars being metabolized in the mitochondria
T b) it is poisonous to chloroplasts
c) it binds with rubisco at higher concentrations
d) it is more difficult to reduce than CO2
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Photosynthesis
Modes of Carbon Fixation
Topic Self-Quiz
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1. The plants most likely found in desert environments are:
a) C4 plants
b) C plants
T c) C3 and CAM plants
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d) CAM plants
e) C4 and CAM plants
answer
2. Which of the following are NOT adaptations found in C4 plants?
a) chloroplast-rich bundle sheath cells
b) crassulacean acids
T c) chloroplast-depleted mesophyll cells
d) elevated levels of PEP carboxylase
answer
3. When you eat a pineapple you are consuming sugars that:
a) were made at night
T b) have a low oxygen content because the plant’s stomata were closed down
c) made during the day from carbon dioxide fixed at night
d) have a high acid content
answer
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