Question 1

Matching 
Choose the correct answer from the list below. Not all the answers will be used.
-Electron transport through the cytochrome b6f complex generates a _____ gradient.

Accepted Answer

A)  photosynthetic reaction center
B)  tyrosyl radical
C)  thylakoid
D)  H₂O
E)  CF₁CF₀F) Z-schemeG) NADPHH) plastoquinoneI) H+J) RuBP carboxylaseK) CO₂L) 2 OH–M) O₂ I

Question 2

Matching 
Choose the correct answer from the list below. Not all the answers will be used.
-The electron pathway from water to NADP+, referred to as the ____, allows two loci for photochemical events.

Accepted Answer

A)  photosynthetic reaction center
B)  tyrosyl radical
C)  thylakoid
D)  H₂O
E)  CF₁CF₀F) Z-schemeG) NADPHH) plastoquinoneI) H+J) RuBP carboxylaseK) CO₂L) 2 OH–M) O₂ F

Question 3

Synthesis of sucrose requires which of the following?
I.glyceraldehyde-3-phosphate and/or dihydroxyacetone phosphate
II.sucrose phosphate kinase
III.sucrose phosphate phosphatase
IV.UTP

Accepted Answer

A)  I, II, III, IV
B)  I, II, IV
C)  I, III, IV
D)  II, III
E)  II, III, IV C

Question 4

Which of the following statements concerning crassulacean acid metabolism (CAM)is TRUE?

Accepted Answer

A)  It allows desert plants to collect CO2 at night for use during the day in the Calvin cycle.
B)  Desert plants utilize CAM to transport CO2 to bundle sheath cells where the Calvin cycle takes place.
C)  It permanently fixes CO2 in place of RuBisCo, avoiding the oxygenase reaction.
D)  CAM facilitates transport of photorespiration products back to the Calvin cycle.
E)  All of the above are true.

Question 5

Based on comparison of oxidative phosphorylation to photophosphoylation, which of the following is TRUE?

Accepted Answer

A)  Photophosphoylation cannot be uncoupled by an ionophore like can be done with oxidative phosphorylation.
B)  The formation of a proton gradient is required for adequate function of both photo- and oxidative phosphorylation.
C)  Although sequence similarities exist between the ATP synthases from each process, little structural similarity is observed.
D)  Photophosphorylation is not dependent on spontaneous electron flow whereas oxidative phosphorylation requires that electron flow be spontaneous.
E)  None of the above is true.

Question 6

Matching 
Choose the correct answer from the list below. Not all the answers will be used.
-The electrons abstracted by the oxygen evolving center (OEC)are relayed to a ______.

Accepted Answer

A)  photosynthetic reaction center
B)  tyrosyl radical
C)  thylakoid
D)  H₂O
E)  CF₁CF₀F) Z-schemeG) NADPHH) plastoquinoneI) H+J) RuBP carboxylaseK) CO₂L) 2 OH–M) O₂

Question 7

Which of the following statements concerning cyclic photophosphorylation is FALSE?

Accepted Answer

A)  Only PSI is used.
B)  Plastocyanin is oxidized by the photosystem.
C)  NADPH donates electrons to the plastoquinone pool.
D)  Ferredoxin accepts electrons from the photosystem and reduces the cytochrome bf complex.
E)  This system is used to pump protons and form an electrochemical gradient to drive the formation of ATP.

Question 8

The protein which passes electrons to NADP+ thus forming the NADPH generated from noncyclic electron transport is

Accepted Answer

A)  ferridoxin-NADP+ reductase.
B)  ferridoxin NADPH dehydrogenase.
C)  ferridoxin FAD dehydrogenase.
D)  FAD reductase.
E)  FAD dehydrogenase.

Question 9

Which of the following are possible functions for the activated electrons from PSI?
I.reduction of NAD+
II.reduction of NADP+
III.formation of ATP
IV.formation of a proton gradient
V.formation of an ionic gradient

Accepted Answer

A)  I, II
B)  I, III
C)  II, III
D)  II, IV
E)  I, V

Question 10

The photosynthetic electron transport system includes the transmembrane complexes PSI, PSII and

Accepted Answer

A)  PSIII.
B)  cytochrome a3.
C)  cytochrome b6f.
D)  cytochrome c.
E)  proton translocating ATP synthase

Question 11

Which statement about carotenoids is FALSE?

Accepted Answer

A)  ( β\betaβ -Carotene is an example of a common accessory pigment..) 
B)  Carotenoids are often used ensure complete coverage of the spectrum.
C)  Carotenoids are contained in the prosthetic ring structure of chlorophylls.
D)  ( β\betaβ -Carotene aides in light absorption for photosynthesis..) 
E)  All of the above statements are true.

Question 12

Light activation of P680 results in which of the following?
I.electron transfer as follows: QA $\rarr$ QB $\rarr$Chlα $\rarr$Pheoα
II.electron transfer from PSI directly back to the Pheoα-QA complex
III.reduction of S4 of the OEC to S1 of the OEC
IV.reduction of cytochrome b6f

Accepted Answer

A)  I, III, IV
B)  I, II
C)  II, III
D)  I only
E)  IV only

Question 13

The redox centers PSII, PbRC, PbRC from Rps.viridis, and cytochrome b6f

Accepted Answer

A)  have identical prosthetic groups that differ only in sequence of arrangement and spatial orientation.
B)  have some degree of symmetry either based on their prosthetic groups or based on tertiary protein structure.
C)  all become reduced due to activity of the OEC.
D)  all of the above
E)  none of the above

Question 14

In the dark reactions of photosynthesis, glyceraldehyde-3-phosphate is converted to dihydroxyacetone phosphate by___.

Accepted Answer

A)  phosphoglucoisomerase
B)  triose phosphate isomerase
C)  glyceraldehyde-3-phosphate dehydrogenase
D)  phosphotriose epimerase
E)  phosphoglycerate kinase

Question 15

Which of the following is the site of ATP synthesis in chloroplasts?

Accepted Answer

A)  smooth outer membrane
B)  inner membrane space
C)  stroma
D)  thylakoid membrane
E)  thylakoid compartment

Question 16

The oxygen evolving center
I.is a part of PSI known as the water splitting enzyme.
II.breaks two H2O molecules into four protons, four electrons and O2.
III.requires four light-dependent reactions to generate O2.
IV.frees an electron from oxygen for replacement of the photooxidized electron in P680.

Accepted Answer

A)  I, II, III, IV
B)  I, II
C)  II, III, IV
D)  II, III
E)  I, IV

Question 17

Which mechanism is the method by which antenna complex chlorophylls funneled energy toward the reaction centers?

Accepted Answer

A)  fluorescence
B)  internal conversion
C)  resonance energy transfer (exciton transfer) 
D)  electron transfer
E)  none of the above

Question 18

A houseplant has been mutated so that its chlorophyll is more efficient at fluorescence than normal.What will be the likely result?

Accepted Answer

A)  Both forms of the light reactions will improve and the plant will better tolerate low light conditions.
B)  Z-scheme photosynthesis will be favored over cyclic photophosphorylation, making additional illumination at long wavelengths necessary.
C)  Cyclic photophosphorylation will be favored over Z-scheme, making additional illumination at short wavelengths necessary.
D)  √Both forms of the light reaction will be impaired and the plant will be less tolerant to low light conditions.
E)  none of the above

Question 19

The major sugar transported to nonphotosynthesizing cells is

Accepted Answer

A)  sucrose.
B)  fructose.
C)  UDP-glucose.
D)  fructose-6-phosphate.
E)  glyceraldehyde-3-phosphate.

Question 20

Which of the following correctly identifies the products and amounts produced from noncyclic electron transport?

Accepted Answer

A)  4 ATP per O2 plus 2 NADPH per 4 electrons liberated from 2 H2O
B)  5 ATP per O2 plus 1 NADPH per 4 electrons liberated from 2 H2O
C)  2.5 ATP per O2 plus 2 NADPH per 2 electrons liberated from 2 H2O
D)  9 ATP per O2 plus 2 NADPH per 4 electrons liberated from 2 H2O
E)  5 ATP equivalents

Exam 19: Photosynthesis

Matching Choose the correct answer from the list below. Not all the answers will be used. -Electron transport through the cytochrome b₆f complex generates a _____ gradient.

Matching Choose the correct answer from the list below. Not all the answers will be used. -The electron pathway from water to NADP⁺, referred to as the ____, allows two loci for photochemical events.

Synthesis of sucrose requires which of the following? I.glyceraldehyde-3-phosphate and/or dihydroxyacetone phosphate II.sucrose phosphate kinase III.sucrose phosphate phosphatase IV.UTP

Which of the following statements concerning crassulacean acid metabolism (CAM) is TRUE?

Based on comparison of oxidative phosphorylation to photophosphoylation, which of the following is TRUE?

Matching Choose the correct answer from the list below. Not all the answers will be used. -The electrons abstracted by the oxygen evolving center (OEC) are relayed to a ______.

Which of the following statements concerning cyclic photophosphorylation is FALSE?

The protein which passes electrons to NADP⁺ thus forming the NADPH generated from noncyclic electron transport is

Which of the following are possible functions for the activated electrons from PSI? I.reduction of NAD⁺ II.reduction of NADP⁺ III.formation of ATP IV.formation of a proton gradient V.formation of an ionic gradient

The photosynthetic electron transport system includes the transmembrane complexes PSI, PSII and

Which statement about carotenoids is FALSE?

Light activation of P680 results in which of the following? I.electron transfer as follows: Q_A $\rarr$ Q_B $\rarr$ Chlα $\rarr$ Pheoα II.electron transfer from PSI directly back to the Pheoα-Q_A complex III.reduction of S₄ of the OEC to S₁ of the OEC IV.reduction of cytochrome b₆f

The redox centers PSII, PbRC, PbRC from Rps.viridis, and cytochrome b₆f

In the dark reactions of photosynthesis, glyceraldehyde-3-phosphate is converted to dihydroxyacetone phosphate by___.

Which of the following is the site of ATP synthesis in chloroplasts?

Which mechanism is the method by which antenna complex chlorophylls funneled energy toward the reaction centers?

A houseplant has been mutated so that its chlorophyll is more efficient at fluorescence than normal.What will be the likely result?

The major sugar transported to nonphotosynthesizing cells is

Which of the following correctly identifies the products and amounts produced from noncyclic electron transport?

Exam 19: Photosynthesis

Matching Choose the correct answer from the list below. Not all the answers will be used. -Electron transport through the cytochrome b6f complex generates a _____ gradient.

Matching Choose the correct answer from the list below. Not all the answers will be used. -The electron pathway from water to NADP+, referred to as the ____, allows two loci for photochemical events.

Synthesis of sucrose requires which of the following? I.glyceraldehyde-3-phosphate and/or dihydroxyacetone phosphate II.sucrose phosphate kinase III.sucrose phosphate phosphatase IV.UTP

Which of the following statements concerning crassulacean acid metabolism (CAM) is TRUE?

Based on comparison of oxidative phosphorylation to photophosphoylation, which of the following is TRUE?

Matching Choose the correct answer from the list below. Not all the answers will be used. -The electrons abstracted by the oxygen evolving center (OEC) are relayed to a ______.

Which of the following statements concerning cyclic photophosphorylation is FALSE?

The protein which passes electrons to NADP+ thus forming the NADPH generated from noncyclic electron transport is

Which of the following are possible functions for the activated electrons from PSI? I.reduction of NAD+ II.reduction of NADP+ III.formation of ATP IV.formation of a proton gradient V.formation of an ionic gradient

The photosynthetic electron transport system includes the transmembrane complexes PSI, PSII and

Which statement about carotenoids is FALSE?

Light activation of P680 results in which of the following? I.electron transfer as follows: QA →\rarr→ QB →\rarr→ Chlα →\rarr→ Pheoα II.electron transfer from PSI directly back to the Pheoα-QA complex III.reduction of S4 of the OEC to S1 of the OEC IV.reduction of cytochrome b6f

The redox centers PSII, PbRC, PbRC from Rps.viridis, and cytochrome b6f

In the dark reactions of photosynthesis, glyceraldehyde-3-phosphate is converted to dihydroxyacetone phosphate by___.

Which of the following is the site of ATP synthesis in chloroplasts?

Which mechanism is the method by which antenna complex chlorophylls funneled energy toward the reaction centers?

A houseplant has been mutated so that its chlorophyll is more efficient at fluorescence than normal.What will be the likely result?

The major sugar transported to nonphotosynthesizing cells is

Which of the following correctly identifies the products and amounts produced from noncyclic electron transport?

Matching Choose the correct answer from the list below. Not all the answers will be used. -Electron transport through the cytochrome b₆f complex generates a _____ gradient.

Matching Choose the correct answer from the list below. Not all the answers will be used. -The electron pathway from water to NADP⁺, referred to as the ____, allows two loci for photochemical events.

The protein which passes electrons to NADP⁺ thus forming the NADPH generated from noncyclic electron transport is

Which of the following are possible functions for the activated electrons from PSI? I.reduction of NAD⁺ II.reduction of NADP⁺ III.formation of ATP IV.formation of a proton gradient V.formation of an ionic gradient

Light activation of P680 results in which of the following? I.electron transfer as follows: Q_A $\rarr$ Q_B $\rarr$ Chlα $\rarr$ Pheoα II.electron transfer from PSI directly back to the Pheoα-Q_A complex III.reduction of S₄ of the OEC to S₁ of the OEC IV.reduction of cytochrome b₆f

The redox centers PSII, PbRC, PbRC from Rps.viridis, and cytochrome b₆f