Question 1

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 D)
G) A) and C)

Question 2

Which stages of the Calvin cycle reactions require the use of energy from ATP?

Accepted Answer

A)   CO2 fixation and CO2 reduction
B)   CO2 reduction and RuBP regeneration
C)   CO2 fixation and RuBP regeneration
D)   CO2 fixation, CO2 reduction, and RuBP regeneration
E)   CO2 reduction and RuBP oxidationF) A) and D)
G) A) and C)

Question 3

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

Question 4

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 5

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

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)   There is not enough information provided to answer the question.F) A) and C)
G) B) and E)

Question 6

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 D)
G) A) and B)

Question 7

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

Question 8

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

Question 9

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

Question 10

Which of the following organisms can perform photosynthesis?

Accepted Answer

A)   algae
B)   fungi
C)   animals
D)   invertebrates
E)   vertebratesF) A) and D)
G) B) and D)

Question 11

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) B) and D)

Question 12

How does ATP synthase obtain the energy to produce ATP?

Accepted Answer

A)   Hydrogen ions flow down a concentration gradient from the thylakoid space to the stroma through ATP synthase, releasing energy that can be used to produce ATP from ADP + Pi.
B)   Water splits, releasing electrons that flow from the stroma to the thylakoid space and attach to the active site of ATP synthase.
C)   Electrons from the reaction site center of photosystem II are funneled to ATP synthase, which uses the energy to produce ATP from ADP + Pi.
D)   Hydrogen ions in the thylakoid space combine with electrons from the stroma at ATP synthase, releasing energy that can be used to produce ATP from ADP + Pi.
E)   A hydrogen ion from NADPH is used by ATP synthase to power the production of ATP from ADP + Pi, and an electron is released, splitting water.F) C) and D)
G) C) and E)

Question 13

Why do plants contain other pigments besides chlorophyll?

Accepted Answer

A)   The additional pigments are able to absorb other light wavelengths that chlorophyll cannot.
B)   The additional pigments can only absorb violet or ultraviolet light.
C)   Chlorophyll is unable to absorb visible light.
D)   When chlorophyll breaks down, the additional pigments can absorb the same wavelengths of light.
E)   When the additional pigments break down, the chlorophyll can absorb other wavelengths of light. Plants use a variety of pigments in order to absorb a broader portion of the visible light spectrum.F) A) and B)
G) A) and C)

Question 14

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

Question 15

Which of the labeled cells of a C3 leaf does not perform photosynthesis? 3 leaf does not perform photosynthesis?   A)  A and B B)  A and D C)  B and D D)  B and C E)  C and D" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   A and B
B)   A and D
C)   B and D
D)   B and C
E)   C and DF) A) and C)
G) C) and D)

Question 16

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 17

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) None of the above
G) A) and B)

Question 18

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 → PSII → electron transport chain → PSI → electron transport chain → NADPH
B)   H2O → 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) A) and B)
G) B) and D)

Question 19

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

Accepted Answer

A)   inability of rubisco to obtain O2
B)   C4 plants need energy to move fixed carbon compounds 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) None of the above
G) C) and D)

Question 20

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

Exam 6: Energy for Life

Which of the following organisms can perform photosynthesis?

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?

Correct AnswerverifiedShow Answer

Which steps of photosynthesis does C4 photosynthesis partition in space?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

CAM photosynthesis limits CO2 fixation to nighttime hours in order to

Correct AnswerverifiedShow Answer

The end product of the Calvin cycle reactions is

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

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 AnswerverifiedShow Answer

Which of the labeled cells of a C3 leaf does not perform photosynthesis?

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

Which stages of the Calvin cycle reactions require the use of energy from ATP?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Why do plants contain other pigments besides chlorophyll?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

How does ATP synthase obtain the energy to produce ATP?

Correct AnswerverifiedShow Answer

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Which steps of photosynthesis does C₄ photosynthesis partition in space?

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

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Which of the labeled cells of a C₃ leaf does not perform photosynthesis?

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

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

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In photosynthesis, the light reactions while the Calvin cycle .

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