Question 1

The O 2 given off during photosynthesis is derived from

Accepted Answer

A)   both CO 2 and H 2O.
B)   RuBP.
C)   CO 2.
D)   NADP +.
E)   H 2O.F) A) and E)
G) All of the above

Question 2

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 D)
G) C) and E)

Question 3

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) A) and B)
G) B) and D)

Question 4

RuBP carboxylase (rubisco)  is able to bind with both

Accepted Answer

A)   carbon dioxide and water.
B)   carbon dioxide and oxygen.
C)   carbon dioxide and NADPH.
D)   oxygen and water.
E)   NADPH and ATP.F) C) and D)
G) A) and E)

Question 5

In C 4 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)   H 2O
D)   CO 2
E)   O 2F) B) and C)
G) B) and D)

Question 6

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

Question 7

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 + P i.
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 + P i.
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 + P i.
E)   A hydrogen ion from NADPH is used by ATP synthase to power the production of ATP from ADP + P i, and an electron is released, splitting water.F) B) and C)
G) All of the above

Question 8

ATP synthasederives 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 H 2O, 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) None of the above
G) A) and E)

Question 9

Not all molecules contain the same amount of chemical energy. What is the energy relationship between G3P and CO 2?

Accepted Answer

A)   G3P and CO 2 have the same amount of energy.
B)   G3P has less energy than CO 2.
C)   Neither G3P nor CO 2 contain any chemical energy.
D)   G3P has more energy than CO 2.
E)   There is not enough information provided to answer the question.F) A) and D)
G) B) and E)

Question 10

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 CO 2 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) B) and E)
G) B) and C)

Question 11

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

Accepted Answer

A)   both C 3 and CAM.
B)   C 4.
C)   CAM.
D)   both C 4 and CAM.
E)   C 3.F) A) and D)
G) A) and E)

Question 12

Thefluid-filled areawithin the chloroplast is called the

Accepted Answer

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

Question 13

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 B)
G) C) and D)

Question 14

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)   CO 2 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) A) and C)
G) C) and D)

Question 15

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 D)
G) A) and C)

Question 16

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 absorb additional wavelengths of light and pass on the energy tothe 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 E)
G) D) and E)

Question 17

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

Accepted Answer

A)   CO 2 fixation and CO 2 reduction
B)   CO 2 reduction and RuBP regeneration
C)   CO 2 fixation and RuBP regeneration
D)   CO 2 fixation, CO 2 reduction, and RuBP regeneration
E)   CO 2 reduction and RuBP oxidationF) A) and B)
G) C) and E)

Question 18

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

Question 19

Which of the following is a function specific to photosystemI?

Accepted Answer

A)   split water to release electrons
B)   rebuild water molecules
C)   produceNADPH
D)   give off oxygen when stimulated by light
E)   combine hydrogen ions with an electron to form waterF) A) and B)
G) A) and C)

Question 20

The light reactions produce ________, which are used in the Calvin cycle. The Calvin cycle releases ________, which return to the light reactions.

Accepted Answer

A)   ATP and NADPH; ADP and NADP
B)   CO 2 and H 2O; glucose and O 2
C)   ATP and CO 2; glucose and O 2
D)   glucose and O 2; CO 2 and H 2O
E)   ADP and NADH; ATP and NADPHF) A) and B)
G) A) and C)

Exam 6: Energy for Life

How does ATP synthase obtain the energy to produce ATP?

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The light reactions produce ________, which are used in the Calvin cycle. The Calvin cycle releases ________, which return to the light reactions.

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Which of the following is a function specific to photosystemI?

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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?

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

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

Correct AnswerverifiedShow Answer

Thefluid-filled areawithin the chloroplast is called the

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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Which of the following is a coenzyme?

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The O 2 given off during photosynthesis is derived from

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Not all molecules contain the same amount of chemical energy. What is the energy relationship between G3P and CO 2?

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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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In C 4 plants, the light reactions will stop during the daytime when the supply of what compound is limited?

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RuBP carboxylase (rubisco) is able to bind with both

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

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

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ATP synthasederives energy for the generation of ATP from

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

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

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

Correct AnswerverifiedShow Answer

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The light reactions produce , which are used in the Calvin cycle. The Calvin cycle releases , which return to the light reactions.

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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?

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The O ₂ given off during photosynthesis is derived from

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Not all molecules contain the same amount of chemical energy. What is the energy relationship between G3P and CO ₂?

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In C ₄ plants, the light reactions will stop during the daytime when the supply of what compound is limited?

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

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