Question 1

Which of the labeled cells of a C 3 leaf is known as a bundle sheath cell? 3 leaf is known as a bundle sheath cell?   A)  A B)  B C)  C D)  D E)  C3 plants do not have bundle sheath cells." class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   A
B)   B
C)   C
D)   D
E)   C3 plants do not have bundle sheath cells.F) C) and D)
G) A) and E)

Question 2

CAM photosynthesis limits CO 2 fixation to nighttime hours in order to

Accepted Answer

A)   allow water to enter leaf spaces during the daylight hours.
B)   open stomata only at night, limiting water loss because of heat and low humidity.
C)   allow NADPH and ATP to enter leaf spaces.
D)   limit the Calvin cycle reactions to nighttime only.
E)   limit water uptake from the soil during daytime hours.F) All of the above
G) A) and D)

Question 3

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

Question 4

The Calvin cycle reactions occur in bundle sheath cells in a C 4 plant

Accepted Answer

A)   to shield the Calvin cycle reactions from O 2 in the leaf spaces.
B)   to allow O 2 to enter bundle sheath cells.
C)   because rubisco is only found in mesophyll cells.
D)   so that they are adjacent to stomata.
E)   so that H 2O is not available to mesophyll cells.F) A) and C)
G) A) and B) A

Question 5

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)   H 2O → PSII → electron transport chain → PSI → electron transport chain → NADPH
B)   H 2O → PSII → chlorophyll b → PSI → chlorophyll a → NADPH
C)   NADPH → PSII → electron transport chain → PSI → electron transport chain → NADP +
D)   NADP + → PSII → electron transport chain → PSI → electron transport chain → NADPH
E)   PSI → electron transport chain → PSII → electron transport chain → NADPHF) C) and D)
G) A) and E)

Question 6

Replacement electrons for the reaction center of photosystem II are derived from

Accepted Answer

A)   H 2O.
B)   NADP +.
C)   G3P.
D)   NADPH.
E)   CO 2.F) A) and E)
G) A) and D) A

Question 7

As climate change leads to drier and drier summers in the southeastern United States, more and more homeowners find that they have crabgrass growing in their yards. The reason for this is that

Accepted Answer

A)   crabgrass is a type of cactus, so it grows better in dry climates.
B)   as the climate changes, homeowners are not caring for their yards as well.
C)   crabgrass is a tropical plant that likes hot, dry climates.
D)   crabgrass is a type of C 3 plant that does well in dry climates.
E)   crabgrass is a type of C 4 plant that does well in dry climates.F) All of the above
G) B) and E)

Question 8

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) A) and C)

Question 9

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

Question 10

The three stages of the Calvin cycle reactions are

Accepted Answer

A)   NADPH reduction, CO 2 fixation, and NADP + regeneration.
B)   NADPH reduction, CO 2 fixation, and RuBP regeneration.
C)   CO 2 fixation, CO 2 reduction, and RuBP regeneration.
D)   CO 2 fixation, CO 2 reduction, and NADP + regeneration.
E)   CO 2 reduction, NADPH reduction, and CO 2 regeneration.F) None of the above
G) B) and E)

Question 11

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 information?

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 C 4 photosynthesis.
C)   This plant falls into the category of CAM-type plants.
D)   This plant uses chemosynthesis rather than photosynthesis.
E)   This is a C 3 type of plant.F) B) and E)
G) C) and D)

Question 12

Which of the following is a coenzyme?

Accepted Answer

A)   starch
B)   cellulose
C)   glucose phosphate
D)   NADP +
E)   sucroseF) B) and E)
G) B) and D)

Question 13

Which statement is accurate about how C 4 plants are able to survive hot, dry spells during the growing season?

Accepted Answer

A)   When the stomata close during the heat of the day, RuBP carboxylase(rubisco) , which is located in the bundle sheath cells, is not exposed to the increasing oxygen concentration in the leaf spaces. This prevents RuBP carboxylase from binding to oxygen instead of carbon dioxide.
B)   When the stomata close during the heat of the day, RuBP carboxylase (rubisco) , which is located in the mesophyll cells,is exposed to the increasing oxygen concentration in the leaf spaces. This help facilitate the binding of RuBP carboxylase to oxygen.
C)   When the stomata are open during the heat of the day, RuBP carboxylase (rubisco) , which is located in the bundle sheath cells, is equally exposed to both the carbon dioxide and the oxygen in the leaf spaces.
D)   When the stomata close during the heat of the day, RuBP carboxylase (rubisco) , which is located in the bundle sheathcells,is exposed to the increasing oxygen concentration in the leaf spaces. This help facilitate the binding of RuBP carboxylase to oxygen.
E)   When the stomata close during the heat of the day, RuBP carboxylase (rubisco) , which is located in the bundle sheath cells,is exposed to the increasing oxygen concentration in the leaf spaces. This help facilitate the binding of RuBP carboxylase to oxygen.F) C) and D)
G) A) and E)

Question 14

The reaction center of photosystem I consists of what type of molecule?

Accepted Answer

A)   chlorophyll a
B)   chlorophyll b
C)   carotenoids
D)   NADP +
E)   electron transport proteinsF) A) and B)
G) B) and D)

Question 15

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

Accepted Answer

A)   to regenerate the starter molecule RuBP
B)   to attract the next CO 2 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 RuBPF) A) and B)
G) B) and E)

Question 16

The _______ from the light reactions is used to reduce CO 2 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) B) and E) A

Question 17

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 CO 2
E)   electrons and CO 2F) C) and E)
G) A) and D)

Question 18

The light-harvesting complexes of a chloroplast are located in the ________; the enzymes of the Calvin cycle reactions are located in the ________.

Accepted Answer

A)   thylakoid membrane; stroma
B)   stroma; thylakoid space
C)   thylakoid space; thylakoid membrane
D)   stroma; thylakoid membrane
E)   thylakoid space; stromaF) B) and C)
G) C) and D)

Question 19

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) All of the above

Question 20

Which of the following is a disadvantage of C 4 photosynthesis relative to C 3 photosynthesis?

Accepted Answer

A)   inability of rubisco to obtain O 2
B)   C4 plants need energy to move fixed carbon compounds into bundle sheath cells
C)   need for stomata to close to conserve H 2O
D)   need for energy to move H 2O into bundle sheath cells
E)   inability of ATP synthase to utilize H + gradient for energyF) A) and D)
G) A) and B)

Exam 6: Energy for Life

Which of the labeled cells of a C 3 leaf is known as a bundle sheath cell?

Correct AnswerverifiedShow Answer

CAM photosynthesis limits CO 2 fixation to nighttime hours in order to

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 AnswerverifiedShow Answer

The Calvin cycle reactions occur in bundle sheath cells in a C 4 plant

Correct AnswerverifiedA

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

Replacement electrons for the reaction center of photosystem II are derived from

Correct AnswerverifiedA

As climate change leads to drier and drier summers in the southeastern United States, more and more homeowners find that they have crabgrass growing in their yards. The reason for this is that

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The three stages of the Calvin cycle reactions are

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 information?

Correct AnswerverifiedShow Answer

Which of the following is a coenzyme?

Correct AnswerverifiedShow Answer

Which statement is accurate about how C 4 plants are able to survive hot, dry spells during the growing season?

Correct AnswerverifiedShow Answer

The reaction center of photosystem I consists of what type of molecule?

Correct AnswerverifiedShow Answer

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

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The _______ from the light reactions is used to reduce CO 2 to a carbohydrate using energy derived from ______.

Correct AnswerverifiedA

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

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The light-harvesting complexes of a chloroplast are located in the ________; the enzymes of the Calvin cycle reactions are located in the ________.

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

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Which of the following is a disadvantage of C 4 photosynthesis relative to C 3 photosynthesis?

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Which of the labeled cells of a C ₃ leaf is known as a bundle sheath cell?

Correct Answer
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CAM photosynthesis limits CO ₂ fixation to nighttime hours in order to

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The Calvin cycle reactions occur in bundle sheath cells in a C ₄ plant

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During photosynthesis, is oxidized, while is reduced.

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Which statement is accurate about how C ₄ plants are able to survive hot, dry spells during the growing season?

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The _ from the light reactions is used to reduce CO ₂ to a carbohydrate using energy derived from .

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

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The light-harvesting complexes of a chloroplast are located in the ; the enzymes of the Calvin cycle reactions are located in the .

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Which of the following is a disadvantage of C ₄ photosynthesis relative to C ₃ photosynthesis?

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