Question 1

The incorporation of DNA into the information transfer system was advantageous because DNA is a(n) catalytic molecule. 
______________

Accepted Answer

A) True 
 B)False

Question 2

Which were the first organisms to release oxygen by photosynthesis?

Accepted Answer

A)  algae 
B)  cyanobacteria 
C)  gymnosperms 
D)  flowering plants 
E)  green sulfur bacteria 
A)  algae 
B)  cyanobacteria 
C)  gymnosperms 
D)  flowering plants 
E)  green sulfur bacteria

Question 3

One critical requirement for life to arise on Earth was time for which to occur?

Accepted Answer

A)  The salinity of the oceans to stabilize 
B)  The Earth's various climates to stabilize 
C)  Molecules to accumulate and react with one another 
D)  The atmospheric temperature to increase sufficiently 
E)  The ozone layer to form, so that the level of ultraviolet radiation was reduced 
A)  The salinity of the oceans to stabilize 
B)  The Earth's various climates to stabilize 
C)  Molecules to accumulate and react with one another 
D)  The atmospheric temperature to increase sufficiently 
E)  The ozone layer to form, so that the level of ultraviolet radiation was reduced

Question 4

The first cells were most likely heterotrophic anaerobes because:

Accepted Answer

A)  they were dependent upon cyanobacteria for oxygen. 
B)  they manufactured organic molecules and needed oxygen. 
C)  they manufactured organic molecules and do not need oxygen. 
D)  they utilized preformed organic molecules and needed oxygen. 
E)  they utilized preformed organic molecules and did not need oxygen. 
A)  they were dependent upon cyanobacteria for oxygen. 
B)  they manufactured organic molecules and needed oxygen. 
C)  they manufactured organic molecules and do not need oxygen. 
D)  they utilized preformed organic molecules and needed oxygen. 
E)  they utilized preformed organic molecules and did not need oxygen.

Question 5

Figure 21-2   During which time period did the animal in the accompanying figure appear?

Accepted Answer

A)  Jurassic 
B)  Triassic 
C)  Permian 
D)  Devonian 
E)  Cretaceous 
A)  Jurassic 
B)  Triassic 
C)  Permian 
D)  Devonian 
E)  Cretaceous

Question 6

Which are assemblages of abiotically produced polymers?

Accepted Answer

A)  ribozymes 
B)  stromatolites 
C)  protobionts 
D)  endosymbionts 
E)  polyribosomes 
A)  ribozymes 
B)  stromatolites 
C)  protobionts 
D)  endosymbionts 
E)  polyribosomes

Question 7

During the Pleistocene epoch, plant communities changed dynamically in response to which mechanism?

Accepted Answer

A)  a meteor impact 
B)  iridium in the soil 
C)  fluctuating climates 
D)  intense grazing pressure 
E)  competition with gymnosperms 
A)  a meteor impact 
B)  iridium in the soil 
C)  fluctuating climates 
D)  intense grazing pressure 
E)  competition with gymnosperms

Exam 21: The Origin and Evolutionary History of Life

The incorporation of DNA into the information transfer system was advantageous because DNA is a(n) catalytic molecule. ______________

Which were the first organisms to release oxygen by photosynthesis?

One critical requirement for life to arise on Earth was time for which to occur?

The first cells were most likely heterotrophic anaerobes because:

Figure 21-2 During which time period did the animal in the accompanying figure appear?

Which are assemblages of abiotically produced polymers?

During the Pleistocene epoch, plant communities changed dynamically in response to which mechanism?

A View of Life

Atoms and Molecules the Chemical Basis of Life

The Chemistry of Life Organic Compounds

Organization of the Cell

Biological Membranes

Cell Communication

Energy and Metabolism

How Cells Make Atp Energy-Releasing Pathways

Photosynthesis Capturing Light Energy

Chromosomes, Mitosis, and Meiosis

The Basic Principles of Heredity

Dna the Carrier of Genetic Information

Gene Expression

Gene Regulation

Dna Technology and Genomics

Human Genetics and the Human Genome

Developmental Genetics

Introduction to Darwinian Evolution

Evolutionary Change in Populations

Speciation and Macroevolution

The Evolution of Primates

Understanding Diversity Systematics

Viruses and Subviral Agents

Bacteria and Archaea

Protists

Seedless Plants

Seed Plants

The Fungi

An Introduction to Animal Diversity

Sponges, Cnidarians, Ctenophores, and Protostomes

The Deuterostomes

Plant Structure Growth and Development

Leaf Structure and Function

Stem Structure and Transport

Roots and Mineral Nutrition

Reproduction in Flowering Plants

Plant Developmental Responses to External and Internal Signals

Animal Structure and Function an Introduction

Protection Support and Movement

Neural Signaling

Neural Regulation

Sensory Systems

Internal Transport

The Immune System Internal Defense

Gas Exchange

Processing Food and Nutrition

Osmoregulation and Disposal of Metabolic Wastes

Endocrine Regulation

Reproduction

Animal Development

Animal Behavior

Introduction to Ecology Population Ecology

Community Ecology

Ecosystems and the Biosphere

Ecology and the Geography of Life

Biological Diversity and Conservation Biology

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