Question 1

Compare and contrast C3, C4, and CAM plants.

Accepted Answer

Refer to T

Question 2

Atmospheric CO2 enters plant leaves through openings called _______.

Accepted Answer

Question 3

How do accessory pigments enhance photosynthetic activity in plants?

Accepted Answer

Accessory pigments allow utilization of

Question 4

A graph that plots the rate at which CO2 is converted to glucose versus the wavelength of light illuminating a leaf is called

Accepted Answer

A)  a Planck equation. 
B)  an absorption spectrum. 
C)  enzyme kinetics. 
D)  an electromagnetic spectrum. 
E)  an action spectrum. 
A)  a Planck equation. 
B)  an absorption spectrum. 
C)  enzyme kinetics. 
D)  an electromagnetic spectrum. 
E)  an action spectrum.

Question 5

In C4 plants, the function of the four-carbon compound that is synthesized in the mesophyll cells is to

Accepted Answer

A)  reduce NADP+. 
B)  combine with CO2 to produce glucose. 
C)  carry CO2 to the bundle sheath cells. 
D)  drive the synthesis of ATP. 
E)  close the stomata. 
A)  reduce NADP+. 
B)  combine with CO2 to produce glucose. 
C)  carry CO2 to the bundle sheath cells. 
D)  drive the synthesis of ATP. 
E)  close the stomata.

Question 6

Photorespiration

Accepted Answer

A)  takes place only in C4 plants. 
B)  includes reactions carried out in peroxisomes. 
C)  increases the yield of photosynthesis. 
D)  is catalyzed by PEP carboxylase. 
E)  is independent of light intensity. 
A)  takes place only in C4 plants. 
B)  includes reactions carried out in peroxisomes. 
C)  increases the yield of photosynthesis. 
D)  is catalyzed by PEP carboxylase. 
E)  is independent of light intensity.

Question 7

Which of the following statements concerning the light reactions of photosynthesis is true?

Accepted Answer

A)  Photosystem I cannot operate independently of photosystem II. 
B)  Photosystems I and II are activated by different wavelengths of light. 
C)  Photosystems I and II transfer electrons and create proton equilibrium across the thylakoid membrane. 
D)  Photosystem I is more significant than Photosystem II. 
E)  Oxygen gas is a product of Photosystem I. 
A)  Photosystem I cannot operate independently of photosystem II. 
B)  Photosystems I and II are activated by different wavelengths of light. 
C)  Photosystems I and II transfer electrons and create proton equilibrium across the thylakoid membrane. 
D)  Photosystem I is more significant than Photosystem II. 
E)  Oxygen gas is a product of Photosystem I.

Question 8

Which of the following does not happen in noncyclic electron transport?

Accepted Answer

A)  Oxygen gas is released. 
B)  ATP forms. 
C)  Water donates electrons and protons. 
D)  NADPH forms. 
E)  CO2 reacts with RuBP. 
A)  Oxygen gas is released. 
B)  ATP forms. 
C)  Water donates electrons and protons. 
D)  NADPH forms. 
E)  CO2 reacts with RuBP.

Question 9

Why do plants undergo both photosynthesis and cellular respiration, even in the daytime? Why don't they simply use the ATP produced in the light reactions of photosynthesis to drive cellular processes?

Accepted Answer

Though photosynthesis produces all the n

Question 10

Why is the absorption spectrum of chlorophyll a not identical to the action spectrum of photosynthesis?

Accepted Answer

A)  Accessory pigments contribute energy to drive photosynthesis. 
B)  Chlorophyll a absorbs both red and blue light. 
C)  Chlorophyll a reflects green light. 
D)  Different wavelengths of light have different energies. 
E)  Chlorophyll a can be activated by absorbing a photon of light. 
A)  Accessory pigments contribute energy to drive photosynthesis. 
B)  Chlorophyll a absorbs both red and blue light. 
C)  Chlorophyll a reflects green light. 
D)  Different wavelengths of light have different energies. 
E)  Chlorophyll a can be activated by absorbing a photon of light.

Question 11

The wide range of wavelengths that photons can have is shown by the _______.

Accepted Answer

electromag

Question 12

NADP is the abbreviation for _______.

Accepted Answer

nicotinami

Question 13

Cyclic electron transport

Accepted Answer

A)  occurs when the ratio of NADPH + H+ to NADP+ in the chloroplasts of some organisms is high. 
B)  is a series of redox reactions. 
C)  stores its released energy as a proton gradient. 
D)  is completed when the electron returns to P700+. 
E)  All of the above 
A)  occurs when the ratio of NADPH + H+ to NADP+ in the chloroplasts of some organisms is high. 
B)  is a series of redox reactions. 
C)  stores its released energy as a proton gradient. 
D)  is completed when the electron returns to P700+. 
E)  All of the above

Question 14

Plants classified as CAM store CO2

Accepted Answer

A)  by making oxaloacetate. 
B)  by making PEP carboxylase. 
C)  in malic acid. 
D)  in crassulacean acid. 
E)  Both a and c 
A)  by making oxaloacetate. 
B)  by making PEP carboxylase. 
C)  in malic acid. 
D)  in crassulacean acid. 
E)  Both a and c

Question 15

The immediate source of energy for ATP synthesis in chloroplasts is

Accepted Answer

A)  electron transport. 
B)  the electrochemical proton gradient. 
C)  light. 
D)  energized chlorophylls. 
E)  NADPH. 
A)  electron transport. 
B)  the electrochemical proton gradient. 
C)  light. 
D)  energized chlorophylls. 
E)  NADPH.

Question 16

The main function of photosynthesis is the

Accepted Answer

A)  consumption of CO2. 
B)  production of ATP. 
C)  conversion of light energy to chemical energy. 
D)  production of starch. 
E)  production of O2. 
A)  consumption of CO2. 
B)  production of ATP. 
C)  conversion of light energy to chemical energy. 
D)  production of starch. 
E)  production of O2.

Question 17

The ultimate source of energy for ATP synthesis in chloroplasts is

Accepted Answer

A)  electron transport. 
B)  the electrochemical proton gradient. 
C)  light. 
D)  energized chlorophylls. 
E)  NADPH. 
A)  electron transport. 
B)  the electrochemical proton gradient. 
C)  light. 
D)  energized chlorophylls. 
E)  NADPH.

Question 18

The concentration of CO2 in Earth's atmosphere has increased over the past 200 years. If this trend continues, as seems likely, what could happen to photosynthesis? Ignore global warming and assume that the content of oxygen in the atmosphere will not change.

Accepted Answer

A)  The net yield C3 photosynthesis should increase; C4 photosynthesis should be unaffected. 
B)  The net yield C3 photosynthesis should decrease; C4 photosynthesis should be unaffected. 
C)  The net yield C3 photosynthesis should stay the same; C4 photosynthesis should increase. 
D)  Both the net yield C3 photosynthesis and C4 photosynthesis should not change. 
E)  None of the above 
A)  The net yield C3 photosynthesis should increase; C4 photosynthesis should be unaffected. 
B)  The net yield C3 photosynthesis should decrease; C4 photosynthesis should be unaffected. 
C)  The net yield C3 photosynthesis should stay the same; C4 photosynthesis should increase. 
D)  Both the net yield C3 photosynthesis and C4 photosynthesis should not change. 
E)  None of the above

Question 19

When RuBP reacts with O2,

Accepted Answer

A)  it cannot react with CO2. 
B)  carbohydrate production increases. 
C)  plant growth is stimulated. 
D)  net carbon fixation increases by 25 percent. 
E)  two carbon molecules combine to form the four-carbon phosphoglycolate. 
A)  it cannot react with CO2. 
B)  carbohydrate production increases. 
C)  plant growth is stimulated. 
D)  net carbon fixation increases by 25 percent. 
E)  two carbon molecules combine to form the four-carbon phosphoglycolate.

Question 20

Photosynthesis is the process that uses light energy to extract hydrogen atoms from

Accepted Answer

A)  glucose. 
B)  chlorophyll. 
C)  CO2. 
D)  water. 
E)  None of the above 
A)  glucose. 
B)  chlorophyll. 
C)  CO2. 
D)  water. 
E)  None of the above

Exam 10: Photosynthesis: Energy From Sunlight

Compare and contrast C3, C4, and CAM plants.

Atmospheric CO2 enters plant leaves through openings called _______.

How do accessory pigments enhance photosynthetic activity in plants?

A graph that plots the rate at which CO2 is converted to glucose versus the wavelength of light illuminating a leaf is called

In C4 plants, the function of the four-carbon compound that is synthesized in the mesophyll cells is to

Photorespiration

Which of the following statements concerning the light reactions of photosynthesis is true?

Which of the following does not happen in noncyclic electron transport?

Why do plants undergo both photosynthesis and cellular respiration, even in the daytime? Why don't they simply use the ATP produced in the light reactions of photosynthesis to drive cellular processes?

Why is the absorption spectrum of chlorophyll a not identical to the action spectrum of photosynthesis?

The wide range of wavelengths that photons can have is shown by the _______.

NADP is the abbreviation for _______.

Cyclic electron transport

Plants classified as CAM store CO2

The immediate source of energy for ATP synthesis in chloroplasts is

The main function of photosynthesis is the

The ultimate source of energy for ATP synthesis in chloroplasts is

The concentration of CO2 in Earth's atmosphere has increased over the past 200 years. If this trend continues, as seems likely, what could happen to photosynthesis? Ignore global warming and assume that the content of oxygen in the atmosphere will not change.

When RuBP reacts with O2,

Photosynthesis is the process that uses light energy to extract hydrogen atoms from

Studying Life

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Proteins, Carbohydrates, and Lipids

Nucleic Acids and the Origin of Life

Cells: the Working Units of Life

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Pathways That Harvest Chemical Energy

The Cell Cycle and Cell Division

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The Origin and Diversification of Eukaryotes

Plants Without Seeds: From Water to Land

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Filters

Compare and contrast C₃, C₄, and CAM plants.

Atmospheric CO₂ enters plant leaves through openings called _______.

A graph that plots the rate at which CO₂ is converted to glucose versus the wavelength of light illuminating a leaf is called

In C₄ plants, the function of the four-carbon compound that is synthesized in the mesophyll cells is to

Plants classified as CAM store CO₂

The concentration of CO₂ in Earth's atmosphere has increased over the past 200 years. If this trend continues, as seems likely, what could happen to photosynthesis? Ignore global warming and assume that the content of oxygen in the atmosphere will not change.

When RuBP reacts with O₂,