Question 1

How much of the protein content in chloroplasts is made up of the enzyme RuBP carboxylase? Why?

Accepted Answer

A)  less than 1%; the enzyme is very fast 
B)  less than 1%; the enzyme also catalyzes several side reactions 
C)  20-50%; the enzyme also catalyzes several side reactions 
D)  20-50%; the enzyme is very slow 
E)  almost 100%; the enzyme is very slow 
A)  less than 1%; the enzyme is very fast 
B)  less than 1%; the enzyme also catalyzes several side reactions 
C)  20-50%; the enzyme also catalyzes several side reactions 
D)  20-50%; the enzyme is very slow 
E)  almost 100%; the enzyme is very slow

Question 2

Visible light has more energy than radio waves.

Accepted Answer

A) True 
 B)False

Question 3

Which statement about producers and/or consumers is true?

Accepted Answer

A)  Consumers not only feed themselves but also feed producers. 
B)  All animals must be either producers or consumers. 
C)  Producers produce more food than they use. 
D)  Consumers are not dependent upon other organisms for food. 
E)  Only one species of producer and consumer can exist in any single community. 
A)  Consumers not only feed themselves but also feed producers. 
B)  All animals must be either producers or consumers. 
C)  Producers produce more food than they use. 
D)  Consumers are not dependent upon other organisms for food. 
E)  Only one species of producer and consumer can exist in any single community.

Question 4

Explain how CAM plants are adapted to a desert type of environment.

Accepted Answer

CAM plants separate components of the ph

Question 5

ATP synthase is an enzyme complex located in the thylakoid membranes.

Accepted Answer

A) True 
 B)False

Question 6

What are the products of the noncyclic electron pathway?

Accepted Answer

A)  H+, O2, ATP, and NADPH 
B)  H+ and O2 
C)  H+, ATP, and NADPH 
D)  ATP and NADPH 
E)  O2 and ATP 
A)  H+, O2, ATP, and NADPH 
B)  H+ and O2 
C)  H+, ATP, and NADPH 
D)  ATP and NADPH 
E)  O2 and ATP

Question 7

Which statement about photosynthesis and cellular respiration is true?

Accepted Answer

A)  Photosynthesis produces water, while cellular respiration uses water. 
B)  Photosynthesis produces oxygen, while cellular respiration uses oxygen. 
C)  Photosynthesis occurs in mitochondria, while cellular respiration occurs in chloroplasts. 
D)  Photosynthesis breaks down carbohydrates, while cellular respiration produces carbohydrates. 
E)  Photosynthesis requires oxygen, while cellular respiration requires sunlight. 
A)  Photosynthesis produces water, while cellular respiration uses water. 
B)  Photosynthesis produces oxygen, while cellular respiration uses oxygen. 
C)  Photosynthesis occurs in mitochondria, while cellular respiration occurs in chloroplasts. 
D)  Photosynthesis breaks down carbohydrates, while cellular respiration produces carbohydrates. 
E)  Photosynthesis requires oxygen, while cellular respiration requires sunlight.

Question 8

Which of the following is a substance that initially traps solar energy in photosynthesis?

Accepted Answer

A)  chlorophyll 
B)  RuBP 
C)  water 
D)  glucose 
E)  pyruvate 
A)  chlorophyll 
B)  RuBP 
C)  water 
D)  glucose 
E)  pyruvate

Question 9

Water is split and oxygen is released in

Accepted Answer

A)  the electron transport chain. 
B)  the cyclic electron pathway. 
C)  the Calvin cycle reactions. 
D)  the noncyclic electron pathway. 
E)  photosystem I. 
A)  the electron transport chain. 
B)  the cyclic electron pathway. 
C)  the Calvin cycle reactions. 
D)  the noncyclic electron pathway. 
E)  photosystem I.

Question 10

Some herbicides inhibit the electron transport chain in the thylakoid membrane. Without the movement of electrons, hydrogen ions would not be pumped from the stroma to the thylakoid space and the hydrogen ion gradient would not be established. How would this affect the Calvin cycle reactions?

Accepted Answer

A)  ATP would not be produced and, as a result, the Calvin cycle reactions would not occur. 
B)  CO2 would not enter the cell as a result, and the Calvin cycle reactions would not occur. 
C)  RuBP carboxylase would not function properly, so CO2 fixation would not occur. 
D)  Sunlight could no longer be used by the chloroplast, but this would have no effect on the Calvin cycle reactions because they do not require light. 
E)  Since the Calvin cycle reactions occur in a different part of the chloroplast, there would be no effect. 
A)  ATP would not be produced and, as a result, the Calvin cycle reactions would not occur. 
B)  CO2 would not enter the cell as a result, and the Calvin cycle reactions would not occur. 
C)  RuBP carboxylase would not function properly, so CO2 fixation would not occur. 
D)  Sunlight could no longer be used by the chloroplast, but this would have no effect on the Calvin cycle reactions because they do not require light. 
E)  Since the Calvin cycle reactions occur in a different part of the chloroplast, there would be no effect.

Question 11

Over time, what would we expect in the evolution of C3, C4, and CAM strategies?

Accepted Answer

A)  As the most complicated plants, CAM plants are most likely to go extinct. 
B)  As the probable ancestral form of photosynthesis, C3 plants are primitive and most likely to go extinct. 
C)  Because CAM plants make better usage of metabolism during the night, they are superior and will eventually become the dominant plants. 
D)  Because CO2 is delivered by the bundle sheath cells in C4 plants, they are superior and will eventually dominate. 
E)  Each form of photosynthesis has advantages in a heterogeneous world and, as long as environmental conditions vary, all forms will have an adaptive advantage in their unique niche. 
A)  As the most complicated plants, CAM plants are most likely to go extinct. 
B)  As the probable ancestral form of photosynthesis, C3 plants are primitive and most likely to go extinct. 
C)  Because CAM plants make better usage of metabolism during the night, they are superior and will eventually become the dominant plants. 
D)  Because CO2 is delivered by the bundle sheath cells in C4 plants, they are superior and will eventually dominate. 
E)  Each form of photosynthesis has advantages in a heterogeneous world and, as long as environmental conditions vary, all forms will have an adaptive advantage in their unique niche.

Question 12

Which of the following statement is true about C3 and C4 plants?

Accepted Answer

A)  C3 plants are more successful in hot climates than C4 plants. 
B)  C3 plants have chloroplasts in the both the bundle sheath cells and the mesophyll cells. 
C)  In C3 plants, O2 competes with CO2 for the active site of RuBP carboxylase. 
D)  C3 plants deliver CO2 to the Calvin cycle using bundle sheath cells sheltered from leaf air spaces. 
E)  In C4 cells, CO2 is fixed at night to decrease water loss. 
A)  C3 plants are more successful in hot climates than C4 plants. 
B)  C3 plants have chloroplasts in the both the bundle sheath cells and the mesophyll cells. 
C)  In C3 plants, O2 competes with CO2 for the active site of RuBP carboxylase. 
D)  C3 plants deliver CO2 to the Calvin cycle using bundle sheath cells sheltered from leaf air spaces. 
E)  In C4 cells, CO2 is fixed at night to decrease water loss.

Question 13

The heavy oxygen isotope (18O) could be provided to plants either in the CO2 or in H2O or in both. Today, we know from experimental results that O2 released from chloroplasts comes from H2O and not from CO2. Which of the following experimental results would show conclusively that O2 is released from H2O and not CO2?

Accepted Answer

A)  When heavy oxygen is part of water given to the plant, the plant produces heavy O2. 
B)  When heavy oxygen is part of both water and CO2 given to the plant, the plant produces heavy O2. 
C)  When no heavy oxygen is part of water given to the plant, the plant produces no heavy O2. 
D)  When no heavy oxygen is part of CO2 given to the plant, the plant produces no heavy O2. 
E)  When heavy oxygen is part of CO2 given to the plant, the plant produces heavy O2. 
A)  When heavy oxygen is part of water given to the plant, the plant produces heavy O2. 
B)  When heavy oxygen is part of both water and CO2 given to the plant, the plant produces heavy O2. 
C)  When no heavy oxygen is part of water given to the plant, the plant produces no heavy O2. 
D)  When no heavy oxygen is part of CO2 given to the plant, the plant produces no heavy O2. 
E)  When heavy oxygen is part of CO2 given to the plant, the plant produces heavy O2.

Question 14

Which of the following organism(s) has/have a dependence on photosynthesis for their energy?

Accepted Answer

A)  white-tailed deer 
B)  wolves 
C)  squirrels 
D)  raccoons 
E)  All of the answer choices will have a dependency on photosynthesis. 
A)  white-tailed deer 
B)  wolves 
C)  squirrels 
D)  raccoons 
E)  All of the answer choices will have a dependency on photosynthesis.

Question 15

Which two organelles are most directly involved in the flow of energy from the sun through all living things?

Accepted Answer

A)  Golgi apparatus and mitochondria 
B)  lysosomes and chloroplasts 
C)  chloroplasts and mitochondria 
D)  mitochondria and ribosomes 
E)  ribosomes and Golgi apparatus 
A)  Golgi apparatus and mitochondria 
B)  lysosomes and chloroplasts 
C)  chloroplasts and mitochondria 
D)  mitochondria and ribosomes 
E)  ribosomes and Golgi apparatus

Question 16

Why are plant leaves green?

Accepted Answer

A)  They absorb only green wavelengths of light. 
B)  They absorb only yellow and blue wavelengths of light. 
C)  They reflect nearly all wavelengths of light. 
D)  They reflect green wavelengths of light. 
E)  They reflect yellow and blue wavelengths of light. 
A)  They absorb only green wavelengths of light. 
B)  They absorb only yellow and blue wavelengths of light. 
C)  They reflect nearly all wavelengths of light. 
D)  They reflect green wavelengths of light. 
E)  They reflect yellow and blue wavelengths of light.

Question 17

In which plant structure does photosynthesis primarily occur?

Accepted Answer

A)  root 
B)  stem 
C)  leaf 
D)  petiole 
E)  bark 
A)  root 
B)  stem 
C)  leaf 
D)  petiole 
E)  bark

Question 18

How many total carbons are involved in carbon dioxide fixation when there are 3 molecules of carbon dioxide and 3 molecules of RuBP?

Accepted Answer

A)  6 
B)  12 
C)  18 
D)  24 
E)  30 
A)  6 
B)  12 
C)  18 
D)  24 
E)  30

Question 19

Which statement is accurate about how C4 plants are able to survive hot, dry spells during the growing season?

Accepted Answer

A)  When the stomata close during heat stress, RuBP carboxylase is not exposed to the increase in oxygen concentration experienced in the leaf. This allows the plant to avoid photorespiration. 
B)  When the stomata close during heat stress, RuBP carboxylase is exposed to the increase in carbon dioxide concentration experienced in the leaf. This allows the plant to avoid photorespiration. 
C)  When the stomata open during heat stress, RuBP carboxylase is not exposed to the increase in oxygen concentration experienced in the leaf. This allows the plant to avoid photorespiration. 
D)  When the stomata close during heat stress, RuBP carboxylase is exposed to the increase in oxygen concentration experienced in the leaf. This allows the plant to undergo photorespiration. 
E)  When the stomata open during heat stress, RuBP carboxylase is not exposed to the increase in oxygen concentration experienced in the leaf. This allows the plant to undergo photorespiration. 
A)  When the stomata close during heat stress, RuBP carboxylase is not exposed to the increase in oxygen concentration experienced in the leaf. This allows the plant to avoid photorespiration. 
B)  When the stomata close during heat stress, RuBP carboxylase is exposed to the increase in carbon dioxide concentration experienced in the leaf. This allows the plant to avoid photorespiration. 
C)  When the stomata open during heat stress, RuBP carboxylase is not exposed to the increase in oxygen concentration experienced in the leaf. This allows the plant to avoid photorespiration. 
D)  When the stomata close during heat stress, RuBP carboxylase is exposed to the increase in oxygen concentration experienced in the leaf. This allows the plant to undergo photorespiration. 
E)  When the stomata open during heat stress, RuBP carboxylase is not exposed to the increase in oxygen concentration experienced in the leaf. This allows the plant to undergo photorespiration.

Question 20

Which of the following is one of the values of photosynthesis to humans?

Accepted Answer

A)  It results in the production of fatty acids and oxygen. 
B)  It results in the production of proteins and oxygen. 
C)  It converts carbohydrates into usable forms of energy for humans. 
D)  It reduces the amount of methane in the atmosphere. 
E)  It reduces the amount of carbon dioxide in the atmosphere. 
A)  It results in the production of fatty acids and oxygen. 
B)  It results in the production of proteins and oxygen. 
C)  It converts carbohydrates into usable forms of energy for humans. 
D)  It reduces the amount of methane in the atmosphere. 
E)  It reduces the amount of carbon dioxide in the atmosphere.

Exam 8: Photosynthesis

How much of the protein content in chloroplasts is made up of the enzyme RuBP carboxylase? Why?

Visible light has more energy than radio waves.

Which statement about producers and/or consumers is true?

Explain how CAM plants are adapted to a desert type of environment.

ATP synthase is an enzyme complex located in the thylakoid membranes.

What are the products of the noncyclic electron pathway?

Which statement about photosynthesis and cellular respiration is true?

Which of the following is a substance that initially traps solar energy in photosynthesis?

Water is split and oxygen is released in

Some herbicides inhibit the electron transport chain in the thylakoid membrane. Without the movement of electrons, hydrogen ions would not be pumped from the stroma to the thylakoid space and the hydrogen ion gradient would not be established. How would this affect the Calvin cycle reactions?

Over time, what would we expect in the evolution of C3, C4, and CAM strategies?

Which of the following statement is true about C3 and C4 plants?

Which of the following organism(s) has/have a dependence on photosynthesis for their energy?

Which two organelles are most directly involved in the flow of energy from the sun through all living things?

Why are plant leaves green?

In which plant structure does photosynthesis primarily occur?

How many total carbons are involved in carbon dioxide fixation when there are 3 molecules of carbon dioxide and 3 molecules of RuBP?

Which statement is accurate about how C4 plants are able to survive hot, dry spells during the growing season?

Which of the following is one of the values of photosynthesis to humans?

The Study of Life

The Molecules of Cells

Cell Structure and Function

Membrane Structure and Function

Cell Division

Metabolism: Energy and Enzymes

Cellular Respiration

Plant Organization and Function

Plant Reproduction and Responses

Human Organization

Cardiovascular System

Lymphatic and Immune Systems

Digestive System and Nutrition

Respiratory System

Urinary System and Excretion

Nervous System

Senses

Musculoskeletal System

Endocrine System

Reproductive System

Development and Aging

Patterns of Gene Inheritance

Chromosomal Basis of Inheritance

Dna Structure and Gene Expression

Biotechnology and Genomics

Evolution of Life

Microbiology

Protists and Fungi

Plants

Animals: the Invertebrates

Animals: Chordates and Vertebrates

Behavioral Ecology

Population and Community Ecology

Nature of Ecosystems

Major Ecosystems of the Biosphere

Conservation Biology

Filters

Over time, what would we expect in the evolution of C₃, C₄, and CAM strategies?

Which of the following statement is true about C₃ and C₄ plants?

Which statement is accurate about how C₄ plants are able to survive hot, dry spells during the growing season?