Question 1

Which statement given below best characterizes the properties of a photosystem?

Accepted Answer

A)  A photosystem consists of just antennae pigments. 
B)  Photosystems do not contain proteins. 
C)  A photosystem consists of just reaction center chlorophylls. 
D)  There is only one photosystem in green plants. 
E)  A photosystem is a complex of pigments, proteins, and a reaction center chlorophyll. 
A)  A photosystem consists of just antennae pigments. 
B)  Photosystems do not contain proteins. 
C)  A photosystem consists of just reaction center chlorophylls. 
D)  There is only one photosystem in green plants. 
E)  A photosystem is a complex of pigments, proteins, and a reaction center chlorophyll.

Question 2

Photosynthesis in green plants occurs only during the day. Respiration in plants occurs

Accepted Answer

A)  only at night. 
B)  only when there is enough ATP. 
C)  only during the day. 
D)  all the time. 
E)  in the chloroplast after photosynthesis. 
A)  only at night. 
B)  only when there is enough ATP. 
C)  only during the day. 
D)  all the time. 
E)  in the chloroplast after photosynthesis.

Question 3

In noncyclic photosynthetic electron transport, water is used to

Accepted Answer

A)  excite chlorophyll. 
B)  hydrolyze ATP. 
C)  reduce Pi. 
D)  oxidize NADPH. 
E)  reduce chlorophyll. 
A)  excite chlorophyll. 
B)  hydrolyze ATP. 
C)  reduce Pi. 
D)  oxidize NADPH. 
E)  reduce chlorophyll.

Question 4

Photorespiration reduces the net carbon fixed by the Calvin cycle by _______ percent.

Accepted Answer

A)  70 
B)  25 
C)  2.1 
D)  0.21 
E)  0.02 
A)  70 
B)  25 
C)  2.1 
D)  0.21 
E)  0.02

Question 5

Global climate change may

Accepted Answer

A)  increase photosynthetic rate. 
B)  increase plant growth. 
C)  change temperature throughout the globe. 
D)  necessitate a change in the crops grown. 
E)  All of the above 
A)  increase photosynthetic rate. 
B)  increase plant growth. 
C)  change temperature throughout the globe. 
D)  necessitate a change in the crops grown. 
E)  All of the above

Question 6

In C4 photosynthesis,

Accepted Answer

A)  3PG is the first product of CO2 fixation. 
B)  rubisco catalyzes the first step in the pathway. 
C)  4-carbon acids are formed by PEP carboxylase in bundle sheath cells. 
D)  photosynthesis continues at lower CO2 levels than in C3 plants. 
E)  CO2 released from RuBP is transferred to PEP. 
A)  3PG is the first product of CO2 fixation. 
B)  rubisco catalyzes the first step in the pathway. 
C)  4-carbon acids are formed by PEP carboxylase in bundle sheath cells. 
D)  photosynthesis continues at lower CO2 levels than in C3 plants. 
E)  CO2 released from RuBP is transferred to PEP.

Question 7

Which of the following statements concerning rubisco is true?

Accepted Answer

A)  Rubisco is a carboxylase. 
B)  Rubisco preferentially binds to O2 over CO2. 
C)  Rubisco is absent from C4 and CAM plants. 
D)  Rubisco catalyzes the splitting in water to release O2. 
E)  Rubisco is more allosterically regulated by CO2. 
A)  Rubisco is a carboxylase. 
B)  Rubisco preferentially binds to O2 over CO2. 
C)  Rubisco is absent from C4 and CAM plants. 
D)  Rubisco catalyzes the splitting in water to release O2. 
E)  Rubisco is more allosterically regulated by CO2.

Question 8

CAM plants differ from C4 plants in that

Accepted Answer

A)  photosynthesis can occur at night in CAM plants. 
B)  CO2 is stored in CAM plants as malic acid. 
C)  the stomata of CAM plants close during periods that favor photorespiration. 
D)  CAM plants use PEP carboxylase to fix CO2. 
E)  the Calvin cycle is only found in C4 and C3 plants, not in CAM plants. 
A)  photosynthesis can occur at night in CAM plants. 
B)  CO2 is stored in CAM plants as malic acid. 
C)  the stomata of CAM plants close during periods that favor photorespiration. 
D)  CAM plants use PEP carboxylase to fix CO2. 
E)  the Calvin cycle is only found in C4 and C3 plants, not in CAM plants.

Question 9

In cyclic photophosphorylation, chlorophyll is reduced by

Accepted Answer

A)  NADPH. 
B)  a chemiosmotic mechanism. 
C)  plastoquinone. 
D)  ATP. 
E)  hydrogen ions liberated by the splitting of a water molecule. 
A)  NADPH. 
B)  a chemiosmotic mechanism. 
C)  plastoquinone. 
D)  ATP. 
E)  hydrogen ions liberated by the splitting of a water molecule.

Question 10

In noncyclic photophosphorylation, the electrons for the reduction of chlorophyll in photosystem II come from _______.

Accepted Answer

The answer of In noncyclic photophosphorylation, the electrons for the...

Question 11

When a photon is absorbed by chlorophyll,

Accepted Answer

A)  the chlorophyll becomes "excited," or energized. 
B)  a greater number of light wavelengths can be absorbed. 
C)  ATP is split into ADP, phosphate, and energy. 
D)  hydrogen ions are released. 
E)  the chlorophyll molecules fluoresce. 
A)  the chlorophyll becomes "excited," or energized. 
B)  a greater number of light wavelengths can be absorbed. 
C)  ATP is split into ADP, phosphate, and energy. 
D)  hydrogen ions are released. 
E)  the chlorophyll molecules fluoresce.

Question 12

Free energy is released in cyclic photophosphorylation

Accepted Answer

A)  by the formation of ATP. 
B)  during the excitation of chlorophyll. 
C)  during the fluorescence of chlorophyll. 
D)  during each of the redox reactions of the electron transport chain. 
E)  when electrons are transferred from photosystem I to photosystem II. 
A)  by the formation of ATP. 
B)  during the excitation of chlorophyll. 
C)  during the fluorescence of chlorophyll. 
D)  during each of the redox reactions of the electron transport chain. 
E)  when electrons are transferred from photosystem I to photosystem II.

Question 13

The first phase of photosynthesis, a series of reactions that requires the absorption of photons to form ATP and NADPH, is referred to as the _______ phase.

Accepted Answer

A)  reduction 
B)  dark reactions 
C)  carbon fixation 
D)  light reactions (or photophosphorylation) 
E)  None of the above 
A)  reduction 
B)  dark reactions 
C)  carbon fixation 
D)  light reactions (or photophosphorylation) 
E)  None of the above

Question 14

The light energy absorbed by the P680 reaction center

Accepted Answer

A)  oxidizes water. 
B)  removes a phosphate from ATP to form ADP. 
C)  fixes CO2 to form sugars. 
D)  is used to form rubisco. 
E)  is reflected and causes plants to appear green. 
A)  oxidizes water. 
B)  removes a phosphate from ATP to form ADP. 
C)  fixes CO2 to form sugars. 
D)  is used to form rubisco. 
E)  is reflected and causes plants to appear green.

Question 15

A molecule that has an absorption spectrum showing maximum absorption within the wavelengths of visible light is

Accepted Answer

A)  a reducing agent. 
B)  a quantum. 
C)  a photon. 
D)  electromagnetic radiation. 
E)  a pigment. 
A)  a reducing agent. 
B)  a quantum. 
C)  a photon. 
D)  electromagnetic radiation. 
E)  a pigment.

Question 16

Which of the following best represent the components that are necessary for photosynthesis to take place?

Accepted Answer

A)  Mitochondria, accessory pigments, visible light, water, and CO2 
B)  Chloroplasts, accessory pigments, visible light, water, and CO2 
C)  Mitochondria, chlorophyll, visible light, water, and O2 
D)  Chloroplasts, chlorophyll, visible light, water, and CO2 
E)  Chlorophyll, accessory pigments, visible light, water, and O2 
A)  Mitochondria, accessory pigments, visible light, water, and CO2 
B)  Chloroplasts, accessory pigments, visible light, water, and CO2 
C)  Mitochondria, chlorophyll, visible light, water, and O2 
D)  Chloroplasts, chlorophyll, visible light, water, and CO2 
E)  Chlorophyll, accessory pigments, visible light, water, and O2

Question 17

A group of scientists led by _______ conducted experiments demonstrating that RuBP is the CO2 acceptor in the dark reactions of photosynthesis.

Accepted Answer

Question 18

How do red and blue light differ from one another?

Accepted Answer

A)  They differ in intensity. 
B)  They have a different number of photons in each quantum. 
C)  Their wavelengths are different. 
D)  They differ in duration. 
E)  Red is radiant, whereas blue is electromagnetic. 
A)  They differ in intensity. 
B)  They have a different number of photons in each quantum. 
C)  Their wavelengths are different. 
D)  They differ in duration. 
E)  Red is radiant, whereas blue is electromagnetic.

Question 19

ATP is produced during the light reactions via

Accepted Answer

A)  CO2 fixation. 
B)  chemiosmosis. 
C)  reduction of water. 
D)  glycolysis. 
E)  noncyclic electron flow from photosystem I. 
A)  CO2 fixation. 
B)  chemiosmosis. 
C)  reduction of water. 
D)  glycolysis. 
E)  noncyclic electron flow from photosystem I.

Question 20

In bright light, the pH of the thylakoid space

Accepted Answer

A)  can become more acidic. 
B)  can become more alkaline. 
C)  stays the same; the pH of the thylakoid space never changes. 
D)  can become neutral. 
E)  None of the above 
A)  can become more acidic. 
B)  can become more alkaline. 
C)  stays the same; the pH of the thylakoid space never changes. 
D)  can become neutral. 
E)  None of the above

Exam 10: Photosynthesis: Energy From Sunlight

Which statement given below best characterizes the properties of a photosystem?

Photosynthesis in green plants occurs only during the day. Respiration in plants occurs

In noncyclic photosynthetic electron transport, water is used to

Photorespiration reduces the net carbon fixed by the Calvin cycle by _______ percent.

Global climate change may

In C4 photosynthesis,

Which of the following statements concerning rubisco is true?

CAM plants differ from C4 plants in that

In cyclic photophosphorylation, chlorophyll is reduced by

In noncyclic photophosphorylation, the electrons for the reduction of chlorophyll in photosystem II come from _______.

When a photon is absorbed by chlorophyll,

Free energy is released in cyclic photophosphorylation

The first phase of photosynthesis, a series of reactions that requires the absorption of photons to form ATP and NADPH, is referred to as the _______ phase.

The light energy absorbed by the P680 reaction center

A molecule that has an absorption spectrum showing maximum absorption within the wavelengths of visible light is

Which of the following best represent the components that are necessary for photosynthesis to take place?

A group of scientists led by _______ conducted experiments demonstrating that RuBP is the CO2 acceptor in the dark reactions of photosynthesis.

How do red and blue light differ from one another?

ATP is produced during the light reactions via

In bright light, the pH of the thylakoid space

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

Cell Signaling and Communication

Energy, Enzymes, and Metabolism

Pathways That Harvest Chemical Energy

The Cell Cycle and Cell Division

Inheritance, Genes, and Chromosomes

Dna and Its Role in Heredity

From Dna to Protein: Gene Expression

Gene Mutation and Molecular Medicine

Regulation of Gene Expression

Genomes

Recombinent Dna and Biotechnology

Differential Gene Expression in Development

Development and Evolutionary Change

Evidence and Mechanisms of Evolution

Reconstructing and Using Phylogenies

Species and Their Formation

Evolution of Genes and Genomes

The History of Life on Earth

Bacteria and Archaea: the Prokaryotic Domains

The Origin and Diversification of Eukaryotes

Plants Without Seeds: From Water to Land

The Evolution of Seed Plants

Fungi: Recyclers, Pathogens, Parasites, and Plant Partners

Animal Origins and the Evolution of Body Plans

Protostome Animals

Deuterostome Animals

The Plant Body

Transport in Plants

Plant Nutrition

Regulation of Plant Growth

Reproduction in Flowering Plants

Plant Responses to Environmental Challenges

Physiology, Homeostasis, and Temperature Regulation

Animal Hormones

Immunology: Animal Defense Systems

Animal Reproduction

Animal Development

Neurons and Nervous Systems

Sensory Systems

The Mammalian Nervous System: Structure and Higher Function

Musculoskeletal Systems

Gas Exchange in Animals

Circulatory Systems

Nutrition, Digestion, and Absorption

Salt and Water Balance and Nitrogen

Animal Behavior

Ecology and the Distribution of Life

Population Ecology

Species Interaction and Coevolution

Community Ecology

Ecosystems and Global Ecology

Conservation Biology

Filters

In C₄ photosynthesis,

CAM plants differ from C₄ plants in that

The light energy absorbed by the P₆₈₀ reaction center

A group of scientists led by _______ conducted experiments demonstrating that RuBP is the CO₂ acceptor in the dark reactions of photosynthesis.