Question 1

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 D)
G) A) and C)

Question 2

A small, low-growing plant found on the surface of a sun-exposed rock on a dry hillside would most likely use which type of photosynthesis?

Accepted Answer

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

Question 3

Before being converted into sucrose, starch, or cellulose, G3P must first be converted into which compound?

Accepted Answer

A)   glucose
B)   galactose
C)   glucose phosphate
D)   fructose
E)   3PGF) A) and C)
G) B) and C)

Question 4

The chlorophyll a molecules in the reaction center of a photosystem participate directly in the capture of solar energy. What is the purpose of the accessory pigments?

Accepted Answer

A)   They participate in the Calvin cycle.
B)   They funnel solar energy to chlorophyll a in the reaction center.
C)   They split the water molecule to supply electrons to the chlorophyll a in the reaction center.
D)   They change the color of the leaves to discourage predators.
E)   They have no purpose.F) B) and C)
G) A) and B)

Question 5

Which of the following is a coenzyme?

Accepted Answer

A)   glyceraldehyde-3-phosphate (G3P) 
B)   chlorophyll a
C)   electron transport protein
D)   rubisco
E)   NADP+F) B) and D)
G) A) and E)

Question 6

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

Accepted Answer

A)   H+ gradient
B)   NADP+
C)   G3P
D)   NADPH
E)   CO2F) A) and C)
G) D) and E)

Question 7

Inside the chloroplasts, chlorophyll is found in the

Accepted Answer

A)   mesophyll.
B)   thylakoid space.
C)   thylakoid membrane.
D)   stroma.
E)   cytoplasm.F) All of the above
G) A) and C)

Question 8

Chlorophyll is to the light reactions as ___ is to the Calvin cycle.

Accepted Answer

A)   NADP+
B)   carbon dioxide
C)   ATP
D)   ATP synthase
E)   RuBPF) C) and D)
G) All of the above

Question 9

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) A) and E)
G) C) and D)

Question 10

During photosynthesis, ___________ is oxidized, while ___________ is reduced.

Accepted Answer

A)   water; carbon dioxide
B)   carbon dioxide; water
C)   carbohydrate; carbon dioxide
D)   carbon dioxide; carbohydrate
E)   carbon dioxide; oxygenF) D) and E)
G) B) and D)

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

ATP and NADPH are both used during the Calvin cycle. What is the function of each?

Accepted Answer

A)   ATP supplies energy and NADPH supplies electrons for reducing power.
B)   ATP supplies energy and NADPH fixes CO2 so it can enter the cycle.
C)   Both ATP and NADPH supply energy to the Calvin cycle.
D)   NADPH supplies energy and ATP supplies electrons for reducing power.
E)   ATP and NADPH are joined into the starter molecule, RuBP, to form glucose.F) A) and B)
G) A) and E)

Question 13

What two things are added to NADP+ to convert it into NADPH?

Accepted Answer

A)   H+ and electrons
B)   electrons and ATP
C)   H+ and ATP
D)   H+ and CO2
E)   electrons and CO2F) B) and C)
G) C) and D)

Question 14

How many turns of the Calvin cycle would be required for a plant to make one molecule of glucose?

Accepted Answer

A)   1
B)   2
C)   3
D)   6
E)   12F) B) and E)
G) B) and D)

Question 15

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) B) and E)
G) C) and E)

Question 16

A plant that uses CAM photosynthesis is most likely to be successful in what type of environment?

Accepted Answer

A)   cool, moist
B)   hot, moist
C)   cool, dry
D)   hot, dry
E)   semi-tropicalF) A) and B)
G) B) and D)

Question 17

The production of glyceraldehyde-3-phosphate (G3P)  in the Calvin cycle requires 6 molecules each of ATP and NADPH. Another 3 molecules of ATP are then used in the cycle. What is the purpose of the 3 additional ATP molecules?

Accepted Answer

A)   To regenerate the starter molecule RuBP.
B)   To attract the next CO2 molecule to enter the Calvin cycle.
C)   To reduce the molecules of G3P to form glucose.
D)   To join acetyl CoA into pyruvate, preparing it to enter the citric acid cycle.
E)   To fix carbon dioxide to RuBP.F) A) and D)
G) A) and C)

Question 18

A new species of plant is discovered and you are asked to help classify it. Upon examination under a microscope, you find that there is a layer of bundle sheath cells containing chloroplasts around the vein of the leaf of the plant. What can you tell about the plant from this?

Accepted Answer

A)   This plant is unlike any other plant that has ever been discovered and is a completely new category of plant.
B)   This plant very likely carries out C4 photosynthesis.
C)   This plant falls into the category of CAM type plants.
D)   This plant uses chemosynthesis rather than photosynthesis.
E)   This is a C3 type of plant.F) None of the above
G) A) and E)

Question 19

Which steps of photosynthesis does C4 photosynthesis partition in space?

Accepted Answer

A)   carbon fixation and Calvin cycle reactions
B)   carbon fixation and light reactions
C)   light reactions and Calvin cycle reactions
D)   glyceraldehyde-3-phosphate (G3P)  formation and glucose phosphate formation
E)   1,3 bisphosphoglycerate (BPG)  formation and glucose phosphate formationF) A) and B)
G) A) and C)

Question 20

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) B) and E)

Exam 6: Energy for Life

During photosynthesis, ___________ is oxidized, while ___________ is reduced.

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The reaction center of each photosystem

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What two things are added to NADP+ to convert it into NADPH?

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

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Chlorophyll is to the light reactions as ___ is to the Calvin cycle.

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The production of glyceraldehyde-3-phosphate (G3P) in the Calvin cycle requires 6 molecules each of ATP and NADPH. Another 3 molecules of ATP are then used in the cycle. What is the purpose of the 3 additional ATP molecules?

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Which steps of photosynthesis does C4 photosynthesis partition in space?

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The three stages of the Calvin cycle reactions are

Correct AnswerverifiedShow Answer

A small, low-growing plant found on the surface of a sun-exposed rock on a dry hillside would most likely use which type of photosynthesis?

Correct AnswerverifiedShow Answer

Inside the chloroplasts, chlorophyll is found in the

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

How many turns of the Calvin cycle would be required for a plant to make one molecule of glucose?

Correct AnswerverifiedShow Answer

A new species of plant is discovered and you are asked to help classify it. Upon examination under a microscope, you find that there is a layer of bundle sheath cells containing chloroplasts around the vein of the leaf of the plant. What can you tell about the plant from this?

Correct AnswerverifiedShow Answer

Which of the following is a coenzyme?

Correct AnswerverifiedShow Answer

The chlorophyll a molecules in the reaction center of a photosystem participate directly in the capture of solar energy. What is the purpose of the accessory pigments?

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

Correct AnswerverifiedShow Answer

ATP and NADPH are both used during the Calvin cycle. What is the function of each?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Before being converted into sucrose, starch, or cellulose, G3P must first be converted into which compound?

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A plant that uses CAM photosynthesis is most likely to be successful in what type of environment?

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During photosynthesis, _ is oxidized, while _ is reduced.

Correct Answer
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What two things are added to NADP⁺ to convert it into NADPH?

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

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

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