Question 1

What is the major disadvantage of CAM photosynthesis relative to C3 or C4 photosynthesis?

Accepted Answer

A)   lower G3P yield
B)   less water loss
C)   less CO2 availability
D)   fewer electrons available from chlorophyll
E)   fewer NADPH molecules from the light reactionsF) A) and C)
G) B) and D)

Question 2

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 B)
G) A) and C)

Question 3

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 C)
G) D) and E)

Question 4

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 the three 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 B)
G) A) and C)

Question 5

In a redox reaction,reduction means _________,and oxidation means _________.

Accepted Answer

A)   loss of electrons; gain of electrons
B)   gain of water; loss of water
C)   gain of electrons; loss of electrons
D)   loss of water; gain of water
E)   gain of protons; loss of protonsF) A) and C)
G) A) and E)

Question 6

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) C) and D)
G) All of the above

Question 7

The Calvin cycle reactions only occur in bundle sheath cells in a C4 plant

Accepted Answer

A)   to shield the Calvin cycle reactions from O2 in the leaf spaces.
B)   to allow O2 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 H2O is not available to mesophyll cells.F) D) and E)
G) C) and D)

Question 8

Carotenoids are found in high concentrations in yellow and orange leaves or vegetables.This color is seen because the carotenoid pigments

Accepted Answer

A)   reflect and transmit yellow and orange wavelengths of light.
B)   absorb yellow and orange wavelengths of light.
C)   absorb or transmit yellow and orange wavelengths of light.
D)   absorb or reflect yellow and orange wavelengths of light.
E)   absorb all wavelengths of light and then transmit yellow and orange wavelengths.F) A) and C)
G) A) and B)

Question 9

The enzyme-rich solution found within the chloroplast is called the

Accepted Answer

A)   granum.
B)   chlorophyll.
C)   cytoplasm.
D)   stroma.
E)   christaeF) B) and C)
G) A) and E)

Question 10

ATP synthase derives energy for the generation of ATP from

Accepted Answer

A)   the movement of hydrogen ions against their concentration gradient into the thylakoid space.
B)   the splitting of H2O which releases electrons.
C)   solar energy captured by the light reactions changing the shape of the enzyme.
D)   electrons transferred from NADPH causing the enzyme to change shape.
E)   the movement of hydrogen ions down their concentration gradient from the thylakoid space to the stroma.F) A) and D)
G) A) and E)

Question 11

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

Question 12

Sucrose,cellulose,amino acids,and starch are all made from what starter molecule in plants?

Accepted Answer

A)   Glucose
B)   Fructose
C)   Glyceraldehyde-3-phosphate (G3P) 
D)   ATP
E)   RuBP carboxylaseF) A) and B)
G) A) and C)

Question 13

In photosynthesis,the light reactions ____________ while the Calvin cycle ____________.

Accepted Answer

A)   capture solar energy; converts the captured energy to chemical potential energy
B)   can occur only in the light; can occur only in the dark
C)   require the presence of ATP; makes ATP
D)   can only function if the stomata are open; can only occur if the stomata are closed
E)   use products manufactured in the dark reactions; creates products used in the dark reactionsF) B) and E)
G) A) and B)

Question 14

The difference between bundle sheath cells in C3 and C4 plants is that

Accepted Answer

A)   the bundle sheath cells in C3 plants have chloroplasts while those in C4 plants do not.
B)   the bundle sheath cells in C4 plants have chloroplasts while those in C3 plants do not.
C)   the bundle sheath cells in C3 plants are arranged in columns just beneath the upper epidermis while those in C4 plants are arranged in a ring around veins.
D)   the bundle sheath cells in C4 plants are arranged in columns just beneath the upper epidermis while those in C3 plants are arranged in a ring around veins.
E)   There is no difference in bundle sheath cells in C3 and C4 plants.F) C) and E)
G) A) and D)

Question 15

In C4 plants,chloroplasts are located

Accepted Answer

A)   in mesophyll cells.
B)   in the stomata.
C)   in both mesophyll and bundle sheath cells.
D)   in bundle sheath cells.
E)   in epidermal cells of the leaf.F) A) and E)
G) A) and C)

Question 16

Which of the following is not derived from G3P?

Accepted Answer

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

Question 17

Which complex or enzyme of photosynthesis consumes H2O?

Accepted Answer

A)   Photosystem I
B)   Photosystem II
C)   rubisco
D)   electron transport chain
E)   ATP synthaseF) B) and D)
G) A) and B)

Question 18

CAM photosynthesis limits CO2 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) None of the above
G) A) and D)

Question 19

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 C3 plant that does well in dry climates.
E)   Crabgrass is a type of C4 plant that does well in dry climates.F) A) and E)
G) A) and D)

Question 20

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

Exam 6: Energy for Life

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

Correct AnswerverifiedShow Answer

What is the major disadvantage of CAM photosynthesis relative to C3 or C4 photosynthesis?

Correct AnswerverifiedShow Answer

The enzyme-rich solution found within the chloroplast is called the

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

ATP synthase derives energy for the generation of ATP from

Correct AnswerverifiedShow Answer

Sucrose,cellulose,amino acids,and starch are all made from what starter molecule in plants?

Correct AnswerverifiedShow Answer

Carotenoids are found in high concentrations in yellow and orange leaves or vegetables.This color is seen because the carotenoid pigments

Correct AnswerverifiedShow Answer

Which complex or enzyme of photosynthesis consumes H2O?

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 the three additional ATP molecules?

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

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In photosynthesis,the light reactions ____________ while the Calvin cycle ____________.

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Which of the following is not derived from G3P?

Correct AnswerverifiedShow Answer

In C4 plants,chloroplasts are located

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In a redox reaction,reduction means _________,and oxidation means _________.

Correct AnswerverifiedShow Answer

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

The difference between bundle sheath cells in C3 and C4 plants is that

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

CAM photosynthesis limits CO2 fixation to nighttime hours in order to

Correct AnswerverifiedShow Answer

The Calvin cycle reactions only occur in bundle sheath cells in a C4 plant

Correct AnswerverifiedShow Answer

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Which complex or enzyme of photosynthesis consumes H₂O?

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

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In photosynthesis,the light reactions while the Calvin cycle .

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In C₄ plants,chloroplasts are located

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In a redox reaction,reduction means _,and oxidation means _.

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The difference between bundle sheath cells in C₃ and C₄ plants is that

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CAM photosynthesis limits CO₂ fixation to nighttime hours in order to

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The Calvin cycle reactions only occur in bundle sheath cells in a C₄ plant

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