Question 1

A plant performing photosynthesis will

Accepted Answer

A)  produce water and consume carbon dioxide.
B)  produce oxygen and consume water.
C)  produce oxygen and consume carbon dioxide.
D)  produce carbon dioxide and consume oxygen.
E)  produce carbon dioxide and consume water.F) C) and E)
G) A) and D)

Question 2

Using 14CO2 as a radioactive tracer,which molecule would be the last to incorporate 14C within the Calvin cycle?

Accepted Answer

A)  ribulose biphosphate (RuBP) 
B)  glyceraldehyde-3-phosphate (G3P) 
C)  rubisco
D)  1,3-biphosphoglycerate (1,3-BPG) 
E)  3-phosphoglycerate (3PG) F) None of the above
G) All of the above

Question 3

A C4 plant minimizes photorespiration by

Accepted Answer

A)  stomata that are only opened at night,storing oxygen in malate,and releasing oxygen during the day.
B)  stomata that are only opened at night,storing carbon dioxide in malate,and releasing carbon dioxide during the day.
C)  having the light reactions and carbon reactions occur in different cells,so oxygen does not come into contact with rubisco.
D)  having the light reactions and carbon reactions occur in different cells,so carbon dioxide does not come into contact with rubisco.E) All of the above
F) B) and D)

Question 4

A plant becomes dried out when

Accepted Answer

A)  stomata close,decreasing gas exchange.
B)  stomata close,increasing gas exchange.
C)  stomata open,decreasing gas exchange.
D)  stomata open,increasing gas exchange.E) B) and D)
F) All of the above

Question 5

What is the main role of the pigment molecules within the antenna or light-harvesting complex?

Accepted Answer

A)  Pass electrons to the electron transport chain and then to NADPH.
B)  Synthesize NADPH.
C)  Increase H+ concentration in the stroma.
D)  Oxidize water and release oxygen to the reaction center chlorophyll.
E)  Absorb photons and transfer light energy to the reaction center chlorophyll.F) A) and B)
G) All of the above

Question 6

When NADP+

Accepted Answer

A)  accepts electrons in the light reaction,it is reduced to form NADPH.
B)  donates electrons in the light reaction,it is oxidized to form NADPH.
C)  donates electrons in the light reaction,it is reduced to form NADPH.
D)  donates electrons in the light reaction,it is hydrolyzed to form NADPH.
E)  accepts electrons in the light reaction,it is oxidized to form NADPH.F) A) and D)
G) A) and C)

Question 7

In hot and arid environments,plants that maximize photorespiration produce the most sugars.

Accepted Answer

A) True 
 B)False

Question 8

If a C3 plant that normally closes its stomata during hot,dry conditions were triggered to open them instead,the most likely outcome would be that

Accepted Answer

A)  O2 enters the leaf,increasing the rate of photosynthesis.
B)  more chlorophyll is made,increasing the rate of photosynthesis.
C)  CO2 enters the leaf,decreasing the rate of photosynthesis.
D)  glucose leaves the leaf,increasing the rate of photosynthesis.
E)  water leaves the leaf,decreasing the rate of photosynthesis.F) A) and E)
G) A) and B)

Question 9

Which of these organisms consume organic molecules to live?

Accepted Answer

A)  Heterotrophs
B)  Autotrophs
C)  Plants
D)  Hemitrophs
E)  PhotoautotrophsF) B) and D)
G) C) and D)

Question 10

Succulent plants such as cacti or pineapple

Accepted Answer

A)  tend to undergo substantial rates of photorespiration.
B)  produce 4-carbon in the first step of carbon fixation.
C)  continually produce sugar,both day and night under hot,arid conditions.
D)  are highly efficient at photosynthesis in cooler and wet environments.
E)  are C3 plants.F) B) and D)
G) D) and E)

Question 11

A thylakoid that is placed in a basic solution will synthesize ATP.How is this possible?

Accepted Answer

A)  A proton gradient is created by the difference in pH.
B)  An electron gradient is created by the difference in pH.
C)  ATP is formed spontaneously at low pH.
D)  The carbon reactions are blocked in the thylakoid at high pH.
E)  ATP cannot be broken down at low pH.F) A) and E)
G) A) and B)

Question 12

The ultimate source of energy for reactions in a plant is

Accepted Answer

A)  glucose.
B)  catabolism.
C)  plants.
D)  the sun.
E)  glycogen.F) B) and C)
G) B) and D)

Question 13

Harnessing light and splitting water occurs in both photosystem I and II.

Accepted Answer

A) True 
 B)False

Question 14

A green plant is first grown in blue light and then in green light.The likely outcome for photosynthesis in both phases is

Accepted Answer

A)  increased plant growth in blue light and no plant growth in green light.
B)  decreased plant growth in blue light and no plant growth in green light.
C)  no plant growth in blue light and increased plant growth in green light.
D)  no plant growth in blue light and decreased plant growth in green light.E) C) and D)
F) All of the above

Question 15

The pigment responsible for the red-yellow coloration seen in leaves during the color change in autumn is

Accepted Answer

A)  chlorophyll b.
B)  carotenoid.
C)  phytol.
D)  chlorophyll a.
E)  porphyrin.F) A) and B)
G) A) and C)

Question 16

In the Calvin Cycle,CO2 binds to

Accepted Answer

A)  photosystem II
B)  water
C)  NADPH
D)  glucose
E)  ribulose bisphosphateF) C) and E)
G) A) and E)

Question 17

CAM (crassulacean acid metabolism) plants such as cacti differ from standard C4 plants such as corn in which of the following ways?

Accepted Answer

A)  CAM plants produce a 4-carbon molecule in the first step of carbon fixation,but C4 plants do not.
B)  CAM plants are more efficient at producing sugar than C4 plants regardless of environmental conditions.
C)  CAM plants are limited to producing CO2 for the Calvin cycle during the day,while C4 plants produce CO2 for the Calvin cycle both during the day and at night.
D)  CAM plants minimize photorespiration whereas C4 plants do not.
E)  CAM plants use both mesophyll and bundle sheath leaf cells for photosynthesis whereas C4 plants do not.F) B) and C)
G) A) and E)

Question 18

In which organelle of the plant does photosynthesis takes place?

Accepted Answer

A)  grana
B)  mesophyll
C)  thylakoid membrane
D)  mitochondria
E)  chloroplastF) A) and C)
G) A) and B)

Question 19

Photorespiration

Accepted Answer

A)  occurs in C4 plants.
B)  uses the enzyme PEP carboxylase rather than rubisco to produce 3-phosphoglycerate.
C)  tends to occur under dry and hot conditions.
D)  requires CO2.
E)  uses a 3-carbon sugar precursor to produce oxygen.F) B) and D)
G) A) and E)

Question 20

The process that forms the electrochemical gradient during photosynthesis is the

Accepted Answer

A)  pumping of H+ into the thylakoid lumen.
B)  movement of water by osmosis.
C)  production of H+ in the stroma during NADPH production.
D)  hydrolysis of ATP.
E)  production of water from oxygen in the thylakoid lumen.F) B) and D)
G) C) and E)

Exam 7: Photosynthesis

A plant performing photosynthesis will

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When NADP+

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A C4 plant minimizes photorespiration by

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If a C3 plant that normally closes its stomata during hot,dry conditions were triggered to open them instead,the most likely outcome would be that

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The ultimate source of energy for reactions in a plant is

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A green plant is first grown in blue light and then in green light.The likely outcome for photosynthesis in both phases is

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Using 14CO2 as a radioactive tracer,which molecule would be the last to incorporate 14C within the Calvin cycle?

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Harnessing light and splitting water occurs in both photosystem I and II.

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In the Calvin Cycle,CO2 binds to

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In which organelle of the plant does photosynthesis takes place?

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The pigment responsible for the red-yellow coloration seen in leaves during the color change in autumn is

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What is the main role of the pigment molecules within the antenna or light-harvesting complex?

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CAM (crassulacean acid metabolism) plants such as cacti differ from standard C4 plants such as corn in which of the following ways?

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Which of these organisms consume organic molecules to live?

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The process that forms the electrochemical gradient during photosynthesis is the

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A plant becomes dried out when

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In hot and arid environments,plants that maximize photorespiration produce the most sugars.

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Photorespiration

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Succulent plants such as cacti or pineapple

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A thylakoid that is placed in a basic solution will synthesize ATP.How is this possible?

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When NADP⁺

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Using ¹⁴CO₂ as a radioactive tracer,which molecule would be the last to incorporate ¹⁴C within the Calvin cycle?

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In the Calvin Cycle,CO₂ binds to

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