Question 1

Which of the following correctly describes CO2 fixation in a C3 plant?

Accepted Answer

A)   Rubisco combines CO2 with RuBP to form a 6-carbon compound that then breaks down into two 3-carbon compounds.
B)   Rubisco combines CO2 with a 2-carbon compound to form G3P.
C)   Rubisco combines CO2 with a 2-carbon compound to form 3PG, which is then reduced to G3P.
D)   Rubisco combines 6 CO2 molecules to form RuBP, which breaks down into two 3-carbon compounds.
E)   Rubisco combines 3 CO2 molecules to form 3PG, which is then reduced to G3P.F) A) and B)
G) A) and D) A

Question 2

The _______ from the light reactions is used to reduce CO2 to a carbohydrate using energy derived from ______.

Accepted Answer

A)   NADPH; ATP
B)   NADP+; ATP
C)   RuBP; ATP
D)   NADPH; RuBP
E)   rubisco; RuBPF) B) and D)
G) A) and E)

Question 3

Not all molecules contain the same amount of chemical energy.The energy relationship between G3P and CO2 is

Accepted Answer

A)   G3P and CO2 have the same amount of energy.
B)   G3P has less energy than CO2.
C)   Neither G3P nor CO2 contain any chemical energy.
D)   G3P has more energy than CO2.E) B) and C)
F) A) and B)

Question 4

In which of the labeled cells of a C4 leaf are the Calvin cycle reactions performed?

Accepted Answer

A)   A and B
B)   B and C
C)   A and D
D)   B only
E)   C onlyF) All of the above
G) B) and C)

Question 5

How many times must the Calvin cycle turn to yield a single molecule of glyceraldehydes-3-phosphate (G3P) .

Accepted Answer

A)   2
B)   3
C)   4
D)   5
E)   6F) A) and E)
G) A) and D)

Question 6

What of the following is a disadvantage of C4 photosynthesis relative to C3 photosynthesis?

Accepted Answer

A)   inability of rubisco to obtain O2
B)   need for energy to move fixed carbon in C4 compound into bundle sheath cells
C)   need for stomata to close to conserve H2O
D)   need for energy to move H2O into bundle sheath cells
E)   inability of ATP synthase to utilize H+ gradient for energyF) C) and E)
G) A) and E)

Question 7

The end product of the Calvin cycle reactions is

Accepted Answer

A)   glucose.
B)   glyceraldehyde-3-phosphate (G3P) .
C)   sucrose.
D)   3-phosphoglycerate (3PG) .
E)   ribulose 1,5-bisphosphate (RuBP) .F) D) and E)
G) A) and E)

Question 8

The light reactions of photosynthesis are said to be similar to a battery because they form a current.In which direction do the electrons of this circuit flow?

Accepted Answer

A)   H2O  →\rarr→  PSII  →\rarr→  electron transport chain  →\rarr→ PSI  →\rarr→  electron transport chain  →\rarr→ NADPH
B)   H2O  →\rarr→  PSII  →\rarr→  chlorophyll b  →\rarr→  PSI  →\rarr→  chlorophyll a  →\rarr→  NADPH
C)   NADPH  →\rarr→  PSII  →\rarr→ electron transport chain  →\rarr→  PSI  →\rarr→  electron transport chain  →\rarr→  NADP+
D)   NADP+  →\rarr→  PSII  →\rarr→  electron transport chain →\rarr→  PSI  →\rarr→  electron transport chain  →\rarr→  NADPH
E)   PSI  →\rarr→  electron transport chain  →\rarr→  PSII  →\rarr→  electron transport chain  →\rarr→  NADPH F) B) and D)
G) B) and C)

Question 9

A coenzyme is defined as

Accepted Answer

A)   a non-protein helper that works with an enzyme.
B)   another enzyme that assists an enzyme with a chemical reaction.
C)   another enzyme in the same biochemical pathway.
D)   a carbohydrate that assists an enzyme.
E)   a protein that is not an enzyme.F) A) and C)
G) C) and E)

Question 10

In C4 plants,the light reactions will stop during the daytime when the supply of what compound is limited?

Accepted Answer

A)   chlorophyll a
B)   NADP+
C)   H2O
D)   CO2
E)   O2F) C) and D)
G) A) and E)

Question 11

The three stages of the Calvin cycle reactions are

Accepted Answer

A)   NADPH reduction, CO2 fixation, and NADP+ regeneration.
B)   NADPH reduction, CO2 fixation, and RuBP regeneration.
C)   CO2 fixation, CO2 reduction, and RuBP regeneration.
D)   CO2 fixation, CO2 reduction, and NADP+ regeneration.
E)   CO2 reduction, NADPH reduction, and CO2 regeneration.F) C) and D)
G) B) and E)

Question 12

The light reactions act much as a battery to power the reactions of the Calvin cycle.This energy is stored as

Accepted Answer

A)   ATP and NADP+.
B)   ADP + Pi.
C)   ADP + Pi and NADP+.
D)   ATP and NADPH.
E)   NADPH and NADP+.F) A) and C)
G) A) and D) D

Question 13

The reaction center of each photosystem

Accepted Answer

A)   splits water to release electrons.
B)   funnels electrons to a central chlorophyll a molecule.
C)   produces NADPH.
D)   gives off oxygen when stimulated by light.
E)   combine hydrogen ions with an electron to form water.F) D) and E)
G) B) and E) B

Question 14

A poison that disrupts the H+ gradient in the thylakoid space would most likely cause which of the following to accumulate during the Calvin cycle reactions?

Accepted Answer

A)   3-phosphoglycerate (3PG) 
B)   ribulose 1,5-bisphosphate (RuBP) 
C)   glyceraldehyde-3-phosphate (G3P) 
D)   NADPH
E)   1,3 bisphosphoglycerate (BPG) F) B) and E)
G) A) and B)

Question 15

The O2 given off during photosynthesis is derived from which compound?

Accepted Answer

A)   CO2 and H2O
B)   RuBP
C)   CO2
D)   NADP+
E)   H2OF) A) and E)
G) A) and D)

Question 16

Energy to drive the formation of ATP in photosynthesis is derived from

Accepted Answer

A)   H+ gradient.
B)   NADP+.
C)   G3P.
D)   NADPH.
E)   CO2.F) All of the above
G) A) and B)

Question 17

The localization of the electron transport chains to the thylakoid membrane ensures that

Accepted Answer

A)   the energy released can be used to establish an H+ ion gradient.
B)   the energy released is stored in the stroma.
C)   NADP+ does not enter the thylakoid space.
D)   CO2 remains in the stroma for the Calvin cycle reactions and does not enter the thylakoid space.
E)   glyceraldehyde-3-phosphate (G3P)  is produced in the thylakoid space.F) C) and D)
G) B) and C)

Question 18

Which compounds link the light reactions with the Calvin cycle reactions?

Accepted Answer

A)   ATP and NADPH
B)   H+ and ATP
C)   G3P and ATP
D)   H+ and G3P
E)   G3P and NADPHF) A) and D)
G) A) and E)

Question 19

In a high latitude rainforest,the dominant type of photosynthesis is most likely to be

Accepted Answer

A)   both C3 and CAM.
B)   C4.
C)   CAM.
D)   both C4 and CAM.
E)   C3.F) C) and D)
G) A) and D)

Question 20

The light reactions produce __________,which are used in the Calvin cycle.The Calvin cycle produces __________,which are in turn used in the light reactions.

Accepted Answer

A)   ATP and NADPH; ADP and NADP
B)   CO2 and H2O; glucose and O2
C)   ATP and CO2; glucose and O2
D)   glucose and O2; CO2 and H2O
E)   ADP and NADH; ATP and NADPHF) B) and E)
G) A) and C)

Exam 6: Energy for Life

Which of the following correctly describes CO2 fixation in a C3 plant?

Correct AnswerverifiedA

The _______ from the light reactions is used to reduce CO2 to a carbohydrate using energy derived from ______.

Correct AnswerverifiedShow Answer

Not all molecules contain the same amount of chemical energy.The energy relationship between G3P and CO2 is

Correct AnswerverifiedShow Answer

In which of the labeled cells of a C4 leaf are the Calvin cycle reactions performed?

Correct AnswerverifiedShow Answer

How many times must the Calvin cycle turn to yield a single molecule of glyceraldehydes-3-phosphate (G3P) .

Correct AnswerverifiedShow Answer

What of the following is a disadvantage of C4 photosynthesis relative to C3 photosynthesis?

Correct AnswerverifiedShow Answer

The end product of the Calvin cycle reactions is

Correct AnswerverifiedShow Answer

The light reactions of photosynthesis are said to be similar to a battery because they form a current.In which direction do the electrons of this circuit flow?

Correct AnswerverifiedShow Answer

A coenzyme is defined as

Correct AnswerverifiedShow Answer

In C4 plants,the light reactions will stop during the daytime when the supply of what compound is limited?

Correct AnswerverifiedShow Answer

The three stages of the Calvin cycle reactions are

Correct AnswerverifiedShow Answer

The light reactions act much as a battery to power the reactions of the Calvin cycle.This energy is stored as

Correct AnswerverifiedD

The reaction center of each photosystem

Correct AnswerverifiedB

A poison that disrupts the H+ gradient in the thylakoid space would most likely cause which of the following to accumulate during the Calvin cycle reactions?

Correct AnswerverifiedShow Answer

The O2 given off during photosynthesis is derived from which compound?

Correct AnswerverifiedShow Answer

Energy to drive the formation of ATP in photosynthesis is derived from

Correct AnswerverifiedShow Answer

The localization of the electron transport chains to the thylakoid membrane ensures that

Correct AnswerverifiedShow Answer

Which compounds link the light reactions with the Calvin cycle reactions?

Correct AnswerverifiedShow Answer

In a high latitude rainforest,the dominant type of photosynthesis is most likely to be

Correct AnswerverifiedShow Answer

The light reactions produce __________,which are used in the Calvin cycle.The Calvin cycle produces __________,which are in turn used in the light reactions.

Correct AnswerverifiedShow Answer

Which of the following correctly describes CO₂ fixation in a C3 plant?

Correct Answer
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A

The _ from the light reactions is used to reduce CO₂ to a carbohydrate using energy derived from .

Correct Answer
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Not all molecules contain the same amount of chemical energy.The energy relationship between G3P and CO₂ is

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D

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B

A poison that disrupts the H⁺ gradient in the thylakoid space would most likely cause which of the following to accumulate during the Calvin cycle reactions?

Correct Answer
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The O₂ given off during photosynthesis is derived from which compound?

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The light reactions produce ,which are used in the Calvin cycle.The Calvin cycle produces ,which are in turn used in the light reactions.

Correct Answer
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