Question 1

The major product of photosynthesis that is exported from the leaves to the rest of the plant is

Accepted Answer

A)  glucose. 
B)  amino acids. 
C)  starch. 
D)  sucrose. 
E)  nucleotides. 
A)  glucose. 
B)  amino acids. 
C)  starch. 
D)  sucrose. 
E)  nucleotides. D

Question 2

In noncyclic photophosphorylation, the chlorophyll in photosystem I returns to its reduced state by

Accepted Answer

A)  water. 
B)  accepting electrons from the transport chain of photosystem II. 
C)  two photons of light. 
D)  NADPH. 
E)  ATP. 
A)  water. 
B)  accepting electrons from the transport chain of photosystem II. 
C)  two photons of light. 
D)  NADPH. 
E)  ATP. B

Question 3

Photosynthesis

Accepted Answer

A)  uses 100 percent of the sunlight that reaches Earth. 
B)  is a very efficient biochemical pathway. 
C)  utilizes all wavelengths of light. 
D)  converts 90 percent of light energy to chemical energy. 
E)  utilizes only a small portion of the energy of sunlight. 
A)  uses 100 percent of the sunlight that reaches Earth. 
B)  is a very efficient biochemical pathway. 
C)  utilizes all wavelengths of light. 
D)  converts 90 percent of light energy to chemical energy. 
E)  utilizes only a small portion of the energy of sunlight. E

Question 4

If you were to grow a green plant in a lighted chamber in the presence of radioactive carbon dioxide for several days, which of the following types of compounds in the plant would be radioactive?

Accepted Answer

A)  Only sugars 
B)  Amino acids and proteins 
C)  Oils and membrane lipids 
D)  Calvin cycle intermediates 
E)  All of the above 
A)  Only sugars 
B)  Amino acids and proteins 
C)  Oils and membrane lipids 
D)  Calvin cycle intermediates 
E)  All of the above

Question 5

A range of energy that cannot be seen by human eyes but has slightly more energy per photon than visible light is known as _______ radiation.

Accepted Answer

A)  adaptive 
B)  solar 
C)  gamma 
D)  ultraviolet 
E)  None of the above 
A)  adaptive 
B)  solar 
C)  gamma 
D)  ultraviolet 
E)  None of the above

Question 6

What is the difference between chlorophyll a and chlorophyll b?

Accepted Answer

A)  Chlorophyll a has a complex ring structure, whereas chlorophyll b has a linear structure. 
B)  Chlorophyll a has a magnesium atom at its center, whereas chlorophyll b has a phosphate group at its center. 
C)  Chlorophyll a has a methyl group, whereas chlorophyll b has an aldehyde group. 
D)  A hydrocarbon tail is found only in chlorophyll a. 
E)  Chlorophyll a fluoresces, whereas chlorophyll b passes the absorbed energy to another molecule. 
A)  Chlorophyll a has a complex ring structure, whereas chlorophyll b has a linear structure. 
B)  Chlorophyll a has a magnesium atom at its center, whereas chlorophyll b has a phosphate group at its center. 
C)  Chlorophyll a has a methyl group, whereas chlorophyll b has an aldehyde group. 
D)  A hydrocarbon tail is found only in chlorophyll a. 
E)  Chlorophyll a fluoresces, whereas chlorophyll b passes the absorbed energy to another molecule.

Question 7

In both photosynthesis and respiration, protons are pumped across a membrane during

Accepted Answer

A)  electron transport. 
B)  photolysis. 
C)  CO2 fixation. 
D)  reduction of O2. 
E)  glycolysis. 
A)  electron transport. 
B)  photolysis. 
C)  CO2 fixation. 
D)  reduction of O2. 
E)  glycolysis.

Question 8

Reaction center chlorophylls

Accepted Answer

A)  undergo reduction when in the excited state. 
B)  become oxidized in the dark. 
C)  are oxidized when in the excited state. 
D)  have a different structure from most of the antennae chlorophylls. 
E)  are not involved in electron transport in photosynthesis. 
A)  undergo reduction when in the excited state. 
B)  become oxidized in the dark. 
C)  are oxidized when in the excited state. 
D)  have a different structure from most of the antennae chlorophylls. 
E)  are not involved in electron transport in photosynthesis.

Question 9

Carotenoids and phycobilins absorb photons between the red and blue wavelengths and are known as _______.

Accepted Answer

The answer of Carotenoids and phycobilins absorb photons between the...

Question 10

The Intergovernmental Panel of Climate Change, sponsored by the United Nations, may be able to impact global climate change by

Accepted Answer

A)  wavelengths of lights that are not part of the absorption spectrum. 
B)  light energy that is not absorbed. 
C)  inefficiency of light reactions that convert light to chemical energy. 
D)  reducing carbon dioxide emissions. 
E)  inefficiency chemical energy storage of photosynthetic products. 
A)  wavelengths of lights that are not part of the absorption spectrum. 
B)  light energy that is not absorbed. 
C)  inefficiency of light reactions that convert light to chemical energy. 
D)  reducing carbon dioxide emissions. 
E)  inefficiency chemical energy storage of photosynthetic products.

Question 11

The light-driven production of ATP from ADP and Pi in the chloroplast is a chemiosmotic mechanism known as _______.

Accepted Answer

photophosp

Question 12

Plants give off O2 because

Accepted Answer

A)  O2 results from the incorporation of CO2 into sugars. 
B)  they do not respire; they photosynthesize. 
C)  water is the initial electron donor, leaving O2 as a photosynthetic by-product. 
D)  electrons moving down the electron chain bind to water, releasing O2. 
E)  O2 is synthesized in the Calvin cycle. 
A)  O2 results from the incorporation of CO2 into sugars. 
B)  they do not respire; they photosynthesize. 
C)  water is the initial electron donor, leaving O2 as a photosynthetic by-product. 
D)  electrons moving down the electron chain bind to water, releasing O2. 
E)  O2 is synthesized in the Calvin cycle.

Question 13

Photosynthesis takes place in plants only in the light. Respiration takes place

Accepted Answer

A)  in the dark only. 
B)  in the light only. 
C)  in all organisms except plants. 
D)  both with and without light. 
E)  None of the above 
A)  in the dark only. 
B)  in the light only. 
C)  in all organisms except plants. 
D)  both with and without light. 
E)  None of the above

Question 14

The fixation of CO2 by PEP carboxylase functions to

Accepted Answer

A)  concentrate O2 for use in photosynthetic cells. 
B)  allow plants to close stomata without the occurrence of photorespiration. 
C)  allow plants to photosynthesize in the dark. 
D)  reduce water loss by the plant. 
E)  All of the above 
A)  concentrate O2 for use in photosynthetic cells. 
B)  allow plants to close stomata without the occurrence of photorespiration. 
C)  allow plants to photosynthesize in the dark. 
D)  reduce water loss by the plant. 
E)  All of the above

Question 15

When white light strikes a blue pigment, blue light is

Accepted Answer

A)  reduced. 
B)  absorbed. 
C)  converted to chemical energy. 
D)  scattered or transmitted. 
E)  used to synthesize ATP. 
A)  reduced. 
B)  absorbed. 
C)  converted to chemical energy. 
D)  scattered or transmitted. 
E)  used to synthesize ATP.

Question 16

Explain the differences between cyclic and noncyclic electron flow. Why are both processes necessary?

Accepted Answer

Noncyclic electron flow involves both ph

Question 17

During cyclic photophosphorylation, the energy to produce ATP is provided by

Accepted Answer

A)  heat. 
B)  NADPH. 
C)  ground-state chlorophyll. 
D)  the redox reactions of the electron transport chain. 
E)  the Calvin-Benson cycle. 
A)  heat. 
B)  NADPH. 
C)  ground-state chlorophyll. 
D)  the redox reactions of the electron transport chain. 
E)  the Calvin-Benson cycle.

Question 18

After the removal of carbon, the oxygen in CO2 ends up

Accepted Answer

A)  as atmospheric oxygen. 
B)  attached to carbon and hydrogen to form sugar (G3P). 
C)  in the soil. 
D)  attached to hydrogen to form water. 
E)  as rubisco. 
A)  as atmospheric oxygen. 
B)  attached to carbon and hydrogen to form sugar (G3P). 
C)  in the soil. 
D)  attached to hydrogen to form water. 
E)  as rubisco.

Question 19

During the process of _______ , rubisco catalyzes the reaction of RuBP with oxygen.

Accepted Answer

The answer of During the process of _______ , rubisco...

Question 20

Photorespiration

Accepted Answer

A)  decreases the efficiency of photosynthesis in C3 plants. 
B)  occurs at high rates in C4 plants. 
C)  is a result of the carboxylation of RuBP. 
D)  takes place entirely within chloroplasts. 
E)  is insensitive to the CO2 to O2 concentration ratio. 
A)  decreases the efficiency of photosynthesis in C3 plants. 
B)  occurs at high rates in C4 plants. 
C)  is a result of the carboxylation of RuBP. 
D)  takes place entirely within chloroplasts. 
E)  is insensitive to the CO2 to O2 concentration ratio.

Exam 10: Photosynthesis: Energy From Sunlight

The major product of photosynthesis that is exported from the leaves to the rest of the plant is

In noncyclic photophosphorylation, the chlorophyll in photosystem I returns to its reduced state by

Photosynthesis

If you were to grow a green plant in a lighted chamber in the presence of radioactive carbon dioxide for several days, which of the following types of compounds in the plant would be radioactive?

A range of energy that cannot be seen by human eyes but has slightly more energy per photon than visible light is known as _______ radiation.

What is the difference between chlorophyll a and chlorophyll b?

In both photosynthesis and respiration, protons are pumped across a membrane during

Reaction center chlorophylls

Carotenoids and phycobilins absorb photons between the red and blue wavelengths and are known as _______.

The Intergovernmental Panel of Climate Change, sponsored by the United Nations, may be able to impact global climate change by

The light-driven production of ATP from ADP and Pi in the chloroplast is a chemiosmotic mechanism known as _______.

Plants give off O2 because

Photosynthesis takes place in plants only in the light. Respiration takes place

The fixation of CO2 by PEP carboxylase functions to

When white light strikes a blue pigment, blue light is

Explain the differences between cyclic and noncyclic electron flow. Why are both processes necessary?

During cyclic photophosphorylation, the energy to produce ATP is provided by

After the removal of carbon, the oxygen in CO2 ends up

During the process of _______ , rubisco catalyzes the reaction of RuBP with oxygen.

Photorespiration

Studying Life

Small Molecules and the Chemistry of Life

Proteins, Carbohydrates, and Lipids

Nucleic Acids and the Origin of Life

Cells: the Working Units of Life

Cell Membranes

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Plants Without Seeds: From Water to Land

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The light-driven production of ATP from ADP and P_i in the chloroplast is a chemiosmotic mechanism known as _______.

Plants give off O₂ because

The fixation of CO₂ by PEP carboxylase functions to

After the removal of carbon, the oxygen in CO₂ ends up