Question 1

The levels of carbon dioxide in the atmosphere

Accepted Answer

A)  peaked around 1950 and have begun slowly decreasing since then. 
B)  are high but not higher than the highest estimated levels in the last 420,000 years. 
C)  are estimated to be higher than at any time in the past 420,000 years. 
D)  began decreasing when the use of CFCs stopped. 
A)  peaked around 1950 and have begun slowly decreasing since then. 
B)  are high but not higher than the highest estimated levels in the last 420,000 years. 
C)  are estimated to be higher than at any time in the past 420,000 years. 
D)  began decreasing when the use of CFCs stopped.

Question 2

The effects of global warming have already been detected in both aquatic and terrestrial ecosystems.

Accepted Answer

A) True 
 B)False

Question 3

Which of the following choices is a major difference between human-caused global change and that which occurs naturally?

Accepted Answer

A)  Human-caused global change occurs more quickly, leaving organisms less time to adapt. 
B)  Human-caused global changes are of a smaller scale than naturally-caused changes. 
C)  Naturally caused global change occurs only at one place on Earth at a time. 
D)  Naturally caused global changes are limited to the terrestrial habitats where humans live. 
A)  Human-caused global change occurs more quickly, leaving organisms less time to adapt. 
B)  Human-caused global changes are of a smaller scale than naturally-caused changes. 
C)  Naturally caused global change occurs only at one place on Earth at a time. 
D)  Naturally caused global changes are limited to the terrestrial habitats where humans live.

Question 4

Why do synthetic chemicals and metals tend to bioaccumulate so readily?

Accepted Answer

A)  These substances are so rare in natural environments that living organisms have developed very efficient methods of collecting them. 
B)  Natural reservoirs are so large that when expressed as a concentration putting the same amount into an organism will always produce an elevated value. 
C)  Synthetic chemicals often have no nutritional value so they are simply stored in the body and passed on when an organism is eaten. 
D)  They are foreign to the metabolism of most organisms and the biochemical systems needed to remove them from the body do not exist. 
A)  These substances are so rare in natural environments that living organisms have developed very efficient methods of collecting them. 
B)  Natural reservoirs are so large that when expressed as a concentration putting the same amount into an organism will always produce an elevated value. 
C)  Synthetic chemicals often have no nutritional value so they are simply stored in the body and passed on when an organism is eaten. 
D)  They are foreign to the metabolism of most organisms and the biochemical systems needed to remove them from the body do not exist.

Question 5

The organisms responsible for most of the conversion of atmospheric molecular nitrogen (N₂) to the nitrate or ammonium that can be used by most other organisms are

Accepted Answer

A)  photosynthetic plants. 
B)  bacteria. 
C)  fungi. 
D)  mammals. 
A)  photosynthetic plants. 
B)  bacteria. 
C)  fungi. 
D)  mammals.

Exam 38: Global Change

The levels of carbon dioxide in the atmosphere

The effects of global warming have already been detected in both aquatic and terrestrial ecosystems.

Which of the following choices is a major difference between human-caused global change and that which occurs naturally?

Why do synthetic chemicals and metals tend to bioaccumulate so readily?

The organisms responsible for most of the conversion of atmospheric molecular nitrogen (N₂) to the nitrate or ammonium that can be used by most other organisms are

The Nature of Science and the Characteristics of Life

Organizing the Diversity of Life

Major Groups of Living Organisms

Chemical Building Blocks

Cell Structure and Internal Compartments

Cell Membranes, Transport, and Communication

Energy and Enzymes

Photosynthesis and Cellular Respiration

Cell Division

Patterns of Inheritance

Chromosomes and Human Genetics

DNA

From Gene to Protein

Control of Gene Expression

DNA Technology

How Evolution Works

Evolution of Populations

Adaptation and Speciation

The Evolutionary History of Life

Maintaining the Internal Environment

Animal Nutrition and Digestion

Gas Exchange

The Circulatory System

Animal Hormones

The Nervous System

Sensing the Environment

Skeletons, Muscles, and Movement

Defenses against Disease

Reproduction and Development

Animal Behavior

Plant Structure, Nutrition, and Transport

Plant Growth and Reproduction

The Biosphere

Growth of Populations

Interactions among Organisms

Communities of Organisms

Ecosystems

Biodiversity and People

Cancer: Cell Division Out of Control

Harnessing the Human Genome

Humans and Evolution

Smoking--Beyond Lung Cancer

Feeding a Hungry Planet

Building a Sustainable Society

Filters