Question 1

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

Accepted Answer

A)   H2O.
B)   NADP+.
C)   G3P.
D)   NADPH.
E)   CO2.F) B) and C)
G) C) and E)

Question 2

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

Question 3

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

Accepted Answer

A)   H+ gradient.
B)   NADP+.
C)   G3P.
D)   NADPH.
E)   CO2.F) C) and E)
G) A) and E)

Question 4

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

Question 5

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

Question 6

Which of the following events does not take place in the light reactions?

Accepted Answer

A)   transfer of electrons to the reaction center of photosystem I
B)   generation of ATP from ADP + Pi
C)   splitting of water, releasing an electron
D)   generation of NADPH from NADP+
E)   conversion of 3PG to G3PF) B) and C)
G) All of the above

Question 7

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

Question 8

The light reactions produce ________, which are used in the Calvin cycle. The Calvin cycle produces ________, which are in turn used in the light reactions.

Accepted Answer

A)   ATP and NADPH; ADP and NADP
B)   CO2 and H2O; glucose and O2
C)   ATP and CO2; glucose and O2
D)   glucose and O2; CO2 and H2O
E)   ADP and NADH; ATP and NADPHF) A) and B)
G) A) and C)

Question 9

A coenzyme is defined as

Accepted Answer

A)   a nonprotein helper that works with an enzyme.
B)   another enzyme that assists an enzyme with a chemical reaction.
C)   another enzyme in the same biochemical pathway.
D)   a carbohydrate that assists an enzyme.
E)   a protein that is not an enzyme.F) B) and E)
G) All of the above

Question 10

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

Question 11

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

Question 12

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

Question 13

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)   CO2 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 B)
G) A) and D)

Question 14

The removal of electrons and/or hydrogen atoms from a substrate is called what?

Accepted Answer

A)   oxidation
B)   reduction
C)   phosphorylation
D)   metabolism
E)   an enzyme-substrate complexF) A) and C)
G) B) and E)

Question 15

How many times must the Calvin cycle turn to yield a single molecule of glyceraldehyde 3-phosphate G3P) ?

Accepted Answer

A)   2
B)   3
C)   4
D)   5
E)   6F) A) and E)
G) A) and D)

Question 16

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

Question 17

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 C)
G) A) and E)

Question 18

Grana are

Accepted Answer

A)   interconnecting stomata.
B)   flattened sacs of thylakoid membrane.
C)   pores that open to allow gas exchange.
D)   the sites of the Calvin cycle and production of sugars.
E)   enzymes that bind CO2.F) A) and E)
G) C) and D)

Question 19

In C4 plants, chloroplasts are located in

Accepted Answer

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

Question 20

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 B)
G) D) and E)

Exam 6: Energy for Life

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

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In C4 plants, chloroplasts are located in

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How many times must the Calvin cycle turn to yield a single molecule of glyceraldehyde 3-phosphate G3P) ?

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Which of the following events does not take place in the light reactions?

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

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Grana are

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Which of the following is a coenzyme?

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

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

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The removal of electrons and/or hydrogen atoms from a substrate is called what?

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

Correct AnswerverifiedShow Answer

The light reactions produce ________, which are used in the Calvin cycle. The Calvin cycle produces ________, which are in turn used in the light reactions.

Correct AnswerverifiedShow Answer

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?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

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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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A coenzyme is defined as

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

Correct AnswerverifiedShow Answer

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In C₄ plants, chloroplasts are located in

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The light reactions produce , which are used in the Calvin cycle. The Calvin cycle produces , which are in turn used in 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 _ from the light reactions is used to reduce CO₂ to a carbohydrate using energy derived from .

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

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