Question 1

Draw a picture of the chloroplast and show the location of and direction in which protons are pumped during photosynthetic light reactions.

Accepted Answer

See Figure 12.7 belo...

Question 2

The third stage of the three-stage Calvin cycle

Accepted Answer

A)   uses ATP and NADPH from the light reactions.
B)   generates a glucose molecule for the plant.
C)   is similar to the reactions found in the glycolysis pathway.
D)   regenerates a C5 sugar for the Calvin cycle to continue.E) A) and B)
F) None of the above

Question 3

The glyoxylate cycle reaction shown below is catalyzed by which enzyme class?

Accepted Answer

A)   lyase
B)   hydrolase
C)   transferase
D)   oxidoreductaseE) All of the above
F) B) and C)

Question 4

Draw the path of electrons in the cyclic photophosphorylation pathway showing the main enzymes and electron carriers involved and demonstrating its cyclic nature.

Accepted Answer

See Figure 12.38 below. photos...

Question 5

Explain how CAM plants cooperate to accomplish the delivery of CO2 to the Calvin cycle.

Accepted Answer

CO₂ is absorbed at night, when it is cool...

Question 6

Under what condition(s)  do the wasteful side reaction of O2 with rubisco become significant?

Accepted Answer

A)   higher levels of CO2 than O2
B)   at night
C)   increased temperature and intense light
D)   increased rubisco concentrationsE) A) and B)
F) None of the above

Question 7

C4 plants are thought to be more efficient than C3 plants because they

Accepted Answer

A)   make larger sugar molecules from CO2.
B)   can concentrate the CO2 in chloroplasts and therefore minimize side reactions with O2.
C)   can produce sugar molecules at night in addition to during the day.
D)   can live in dry climates.E) All of the above
F) C) and D)

Question 8

What is the process depicted below, where plants react with O2? 2?   A)  photorespiration B)  photosynthesis C)  photogeneration D)  photoglycolate pathway" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   photorespiration
B)   photosynthesis
C)   photogeneration
D)   photoglycolate pathwayE) All of the above
F) A) and C)

Question 9

List the five steps of photosynthesis, whereby solar energy is converted into chemical energy.

Accepted Answer

(1) Photons oxidize chlorophyll, which i...

Question 10

Ribulose bisphosphate carboxylase (rubisco)

Accepted Answer

A)   is the most abundant enzyme in the biosphere, comprising as much as 50% of plant cell protein.
B)   catalyzes the reaction of C5 molecule and CO2 with a C6 sugar product.
C)   is located in the thylakoid lumen.
D)   requires NADPH and ATP to fix CO2.E) A) and B)
F) A) and C)

Question 11

The __________ is driven directly by photons from the sun in photosynthesis light reactions.

Accepted Answer

A)   pumping of protons
B)   synthesis of ATP
C)   transfer of electrons
D)   synthesis of glucoseE) C) and D)
F) A) and B)

Question 12

Approximately how many ATP are synthesized per O2 molecule generated in photosynthesis light reactions?

Accepted Answer

A)   3
B)   4
C)   8
D)   12E) A) and C)
F) None of the above

Question 13

What is the main difference between C4 and CAM plants?

Accepted Answer

CAM plants open up their stomata at nigh...

Question 14

Which is the orange pigment commonly found in plant's light harvesting complexes?

Accepted Answer

A)   "chlorophyll"
B)   "phycocyanobilin"
C)   "porphyrin"
D)   " β\betaβ -carotene" E) B) and C)
F) All of the above

Question 15

What is the overall reaction for the Calvin cycle, or dark reactions?

Accepted Answer

A)   2 H2O + 2 NADP+ + 3 ADP + 3 Pi  →\rightarrow→ O2 + 2 NADPH + 3 ATP
B)   3 CO2 + 6 NADPH + 9 ATP + 6 H2O  →\rightarrow→ Glyceraldehyde-3-phosphate + 6 NADP+ + 9 ADP + 9 Pi
C)   6 CO2 + 6 NADPH + 12 ATP  →\rightarrow→  Glucose + NADP+ + ADP + Pi
D)   Glucose  →\rightarrow→  9 ATP + 12 NADPH + 6 CO2 + 6 H2O E) All of the above
F) A) and C)

Question 16

List the three possible fates of an electron in an excited state chlorophyll molecule.

Accepted Answer

See Figure 12.9 below. (1) Electron tran...

Question 17

What is the cellular location of the plant glyoxylate cycle?

Accepted Answer

A)   chloroplast stroma
B)   cytoplasm
C)   mitochondria
D)   glyoxysomeE) A) and B)
F) A) and C)

Question 18

Name the two key enzymes involved in swapping carbons between sugars in the carbon shuffling reactions of stage 3 of the Calvin cycle, and describe the differences in their
reactions.

Accepted Answer

Transaldolase and transketolase. Transal...

Question 19

Briefly describe the three stages of the Calvin cycle.

Accepted Answer

(1) The enzyme rubisco catalyzes the fix...

Question 20

List the four proteins/enzymes and the one molecule involved in the electron transfers in the photosynthetic Z scheme, and show their positions in the "Z" shape.

Accepted Answer

(1) Photosystem 1 (PSI), (2) photosystem...

Exam 12: Photosynthesis

Ribulose bisphosphate carboxylase (rubisco)

Correct AnswerverifiedShow Answer

List the five steps of photosynthesis, whereby solar energy is converted into chemical energy.

Correct Answerverified(1) Photons oxidize chlorophyll, which i...View AnswerShow Answer

Draw the path of electrons in the cyclic photophosphorylation pathway showing the main enzymes and electron carriers involved and demonstrating its cyclic nature.

Correct AnswerverifiedSee Figure 12.38 below. photos...View AnswerShow Answer

Explain how CAM plants cooperate to accomplish the delivery of CO2 to the Calvin cycle.

Correct AnswerverifiedCO2 is absorbed at night, when it is cool...View AnswerShow Answer

Which is the orange pigment commonly found in plant's light harvesting complexes?

Correct AnswerverifiedShow Answer

What is the cellular location of the plant glyoxylate cycle?

Correct AnswerverifiedShow Answer

The glyoxylate cycle reaction shown below is catalyzed by which enzyme class?

Correct AnswerverifiedShow Answer

What is the process depicted below, where plants react with O2?

Correct AnswerverifiedShow Answer

What is the overall reaction for the Calvin cycle, or dark reactions?

Correct AnswerverifiedShow Answer

C4 plants are thought to be more efficient than C3 plants because they

Correct AnswerverifiedShow Answer

List the three possible fates of an electron in an excited state chlorophyll molecule.

Correct AnswerverifiedSee Figure 12.9 below. (1) Electron tran...View AnswerShow Answer

List the four proteins/enzymes and the one molecule involved in the electron transfers in the photosynthetic Z scheme, and show their positions in the "Z" shape.

Correct Answerverified(1) Photosystem 1 (PSI), (2) photosystem...View AnswerShow Answer

Draw a picture of the chloroplast and show the location of and direction in which protons are pumped during photosynthetic light reactions.

Correct AnswerverifiedSee Figure 12.7 belo...View AnswerShow Answer

Under what condition(s) do the wasteful side reaction of O2 with rubisco become significant?

Correct AnswerverifiedShow Answer

Name the two key enzymes involved in swapping carbons between sugars in the carbon shuffling reactions of stage 3 of the Calvin cycle, and describe the differences in their reactions.

Correct AnswerverifiedTransaldolase and transketolase. Transal...View AnswerShow Answer

The __________ is driven directly by photons from the sun in photosynthesis light reactions.

Correct AnswerverifiedShow Answer

What is the main difference between C4 and CAM plants?

Correct AnswerverifiedCAM plants open up their stomata at nigh...View AnswerShow Answer

The third stage of the three-stage Calvin cycle

Correct AnswerverifiedShow Answer

Briefly describe the three stages of the Calvin cycle.

Correct Answerverified(1) The enzyme rubisco catalyzes the fix...View AnswerShow Answer

Approximately how many ATP are synthesized per O2 molecule generated in photosynthesis light reactions?

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified
(1) Photons oxidize chlorophyll, which i...
View Answer

Correct Answer
verified
See Figure 12.38 below. photos...
View Answer

Explain how CAM plants cooperate to accomplish the delivery of CO₂ to the Calvin cycle.

Correct Answer
verified
CO₂ is absorbed at night, when it is cool...
View Answer

Correct Answer
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Correct Answer
verified

Correct Answer
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What is the process depicted below, where plants react with O₂?

Correct Answer
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Correct Answer
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C₄ plants are thought to be more efficient than C₃ plants because they

Correct Answer
verified

Correct Answer
verified
See Figure 12.9 below. (1) Electron tran...
View Answer

Correct Answer
verified
(1) Photosystem 1 (PSI), (2) photosystem...
View Answer

Correct Answer
verified
See Figure 12.7 belo...
View Answer

Under what condition(s) do the wasteful side reaction of O₂ with rubisco become significant?

Correct Answer
verified

Correct Answer
verified
Transaldolase and transketolase. Transal...
View Answer

Correct Answer
verified

What is the main difference between C₄ and CAM plants?

Correct Answer
verified
CAM plants open up their stomata at nigh...
View Answer

Correct Answer
verified

Correct Answer
verified
(1) The enzyme rubisco catalyzes the fix...
View Answer

Approximately how many ATP are synthesized per O₂ molecule generated in photosynthesis light reactions?

Correct Answer
verified