Question 1

Under what conditions does cyclic photophosphorylation take place?

Accepted Answer

A)   in an acidic stroma
B)   with high levels of NADPH
C)   with high levels of ATP
D)   with an inactivated photosystem IE) C) and D)
F) All of the above

Question 2

The O2 generated from photosynthesis is derived from

Accepted Answer

A)   CO2 reduction to glyceraldehyde-3-phosphate.
B)   CO2 reduction to glycerate-3-phosphate.
C)   water molecules that directly reduce PSI*.
D)   water molecules that directly reduce PSII*.E) C) and D)
F) B) and D)

Question 3

Which electron carrier molecule in the photosynthetic electron transport chain is largely hydrophobic and found floating in the thylakoid membrane?

Accepted Answer

A)   heme
B)   chlorophyll
C)   pheophytin
D)   plastoquinoneE) B) and D)
F) B) and C)

Question 4

The primary difference between ATP synthesis during the photosynthetic light reactions and ATP synthesis in the mitochondrial electron transport chain is the

Accepted Answer

A)   cellular location of the proton motive force.
B)   enzyme catalyzing the ATP synthesis.
C)   number of ATP produced per 360 °\degree°  rotation of the F1 subunit of ATP synthase.
D)   number of NADPH required to produce ATP. E) C) and D)
F) B) and C)

Question 5

For photosynthesis, sunlight energy drives electron transfer. Where are the electrons ejected from when light is absorbed?

Accepted Answer

A)   photons released by chlorophyll
B)   NADPH
C)   light-harvesting pigments in PSI and PSII
D)   oxygenE) All of the above
F) B) and C)

Question 6

Where do electrons from photosystem II (PSII)  come from to re-reduce the oxidized P680+ state?

Accepted Answer

A)   O2
B)   NADPH
C)   plastocyanin
D)   H2OE) B) and C)
F) B) and D)

Question 7

Which complex in the photosynthetic electron transport chain pumps protons as electrons pass through it?

Accepted Answer

A)   plastocyanin
B)   cytochrome b6f
C)   photosystem I
D)   photosystem IIE) B) and C)
F) All of the above

Question 8

The energy derived from photosynthesis and used to make ATP is manifested in what form?

Accepted Answer

A)   an acidic stroma
B)   an electron gradient in the thylakoid membrane
C)   an acidic thylakoid lumen
D)   an acidic cytoplasmE) A) and D)
F) None of the above

Question 9

Chlorophyll absorbs

Accepted Answer

A)   heat energy and reaches an excited state.
B)   photon energy and becomes excited or oxidized.
C)   an electron during photon excitation.
D)   all wavelengths of light.E) A) and B)
F) All of the above

Question 10

Which of the following is true of the glyoxylate cycle?

Accepted Answer

A)   It allows plants to produce glucose from fats and two-carbon molecules like acetate.
B)   It occurs in plant cells as an alternative to photosynthesis.
C)   It bypasses all regulated steps of the TCA cycle.
D)   It results in a net production of ATP and NADH without proceeding through the TCA cycle.E) All of the above
F) B) and C)

Question 11

What is the name of the enzyme that catalyzes the reaction shown below?

Accepted Answer

A)   ribulose bisphosphate carboxylase
B)   acetyl-CoA carboxylase
C)   glyceraldehyde-3-phosphate dehydrogenase
D)   pyruvate carboxylaseE) None of the above
F) A) and D)

Question 12

Heme and chlorophyll have the same porphyrin cofactor, yet they have largely different roles. Compare their color and the metal ions employed by each.

Accepted Answer

Chlorophyl...

Question 13

What is a reason for keeping photosystem I (PSI)  and photosystem II (PSII)  separate in the chloroplasts?

Accepted Answer

A)   They are involved in different pathways and not involved with each other.
B)   They would quench each other by energy transfer.
C)   They have different sunlight exposure requirements.
D)   They have different ATP consumption requirements.E) A) and B)
F) A) and C)

Question 14

Resonance energy transfer from one chlorophyll in the photosystems results in

Accepted Answer

A)   a reduced neighboring pheophytin molecule.
B)   a neighboring chlorophyll in an excited state.
C)   heat release.
D)   the release of a photon.E) B) and D)
F) B) and C)

Question 15

What is the name of the plant leaf openings that open during the night and close during the day in CAM plants?

Accepted Answer

A)   mesophyll cells
B)   stomata
C)   guard cells
D)   malate pore proteinsE) A) and B)
F) All of the above

Question 16

Which cell type in C4 plants is isolated from O2 exposure as they perform Calvin cycle reactions?

Accepted Answer

A)   Hatch-Slack cells
B)   bundle sheath cells
C)   guard cells
D)   mesophyll cellsE) All of the above
F) B) and C)

Question 17

Which is a characteristic of the second stage of the three-stage Calvin cycle?

Accepted Answer

A)   It uses ATP and NADPH.
B)   It is similar to a series of reactions in pentose phosphate pathway.
C)   It is catalyzed by an enzyme called rubisco.
D)   It begins and ends with a C5 sugar.E) B) and C)
F) B) and D)

Question 18

Hypothesize how the combustion of large quantities of fossil fuels could affect the cycle shown below. Then explain how this could be further complicated by the global loss of vegetation, such as by the cutting of rain forests.

Accepted Answer

The formation of CO₂ from burning fossil ...

Question 19

Chlorophyll absorbs light energy efficiently because of the

Accepted Answer

A)   metal ion in the center of the molecule.
B)   ring structure.
C)   planar structure.
D)   alternating double and single bonds.E) B) and C)
F) None of the above

Question 20

The chloroplast contains a highly folded membrane called the

Accepted Answer

A)   thylakoid.
B)   lumen.
C)   inner membrane.
D)   matrix.E) All of the above
F) A) and B)

Exam 12: Photosynthesis

Chlorophyll absorbs

Correct AnswerverifiedShow Answer

Which electron carrier molecule in the photosynthetic electron transport chain is largely hydrophobic and found floating in the thylakoid membrane?

Correct AnswerverifiedShow Answer

The O2 generated from photosynthesis is derived from

Correct AnswerverifiedShow Answer

What is a reason for keeping photosystem I (PSI) and photosystem II (PSII) separate in the chloroplasts?

Correct AnswerverifiedShow Answer

The energy derived from photosynthesis and used to make ATP is manifested in what form?

Correct AnswerverifiedShow Answer

Which is a characteristic of the second stage of the three-stage Calvin cycle?

Correct AnswerverifiedShow Answer

Which cell type in C4 plants is isolated from O2 exposure as they perform Calvin cycle reactions?

Correct AnswerverifiedShow Answer

Resonance energy transfer from one chlorophyll in the photosystems results in

Correct AnswerverifiedShow Answer

Where do electrons from photosystem II (PSII) come from to re-reduce the oxidized P680+ state?

Correct AnswerverifiedShow Answer

Chlorophyll absorbs light energy efficiently because of the

Correct AnswerverifiedShow Answer

The chloroplast contains a highly folded membrane called the

Correct AnswerverifiedShow Answer

What is the name of the enzyme that catalyzes the reaction shown below?

Correct AnswerverifiedShow Answer

For photosynthesis, sunlight energy drives electron transfer. Where are the electrons ejected from when light is absorbed?

Correct AnswerverifiedShow Answer

Heme and chlorophyll have the same porphyrin cofactor, yet they have largely different roles. Compare their color and the metal ions employed by each.

Correct AnswerverifiedChlorophyl...View AnswerShow Answer

What is the name of the plant leaf openings that open during the night and close during the day in CAM plants?

Correct AnswerverifiedShow Answer

Under what conditions does cyclic photophosphorylation take place?

Correct AnswerverifiedShow Answer

The primary difference between ATP synthesis during the photosynthetic light reactions and ATP synthesis in the mitochondrial electron transport chain is the

Correct AnswerverifiedShow Answer

Hypothesize how the combustion of large quantities of fossil fuels could affect the cycle shown below. Then explain how this could be further complicated by the global loss of vegetation, such as by the cutting of rain forests.

Correct AnswerverifiedThe formation of CO2 from burning fossil ...View AnswerShow Answer

Which of the following is true of the glyoxylate cycle?

Correct AnswerverifiedShow Answer

Which complex in the photosynthetic electron transport chain pumps protons as electrons pass through it?

Correct AnswerverifiedShow Answer

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The O₂ generated from photosynthesis is derived from

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Which cell type in C₄ plants is isolated from O₂ exposure as they perform Calvin cycle reactions?

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Where do electrons from photosystem II (PSII) come from to re-reduce the oxidized P680⁺ state?

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Chlorophyl...
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The formation of CO₂ from burning fossil ...
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