Question 1

The earth's earliest atmosphere was likely composed mostly of gaseous

Accepted Answer

A) hydrogen. 
B) nitrogen. 
C) water vapor. 
D) carbon dioxide. 
E) mixtures of these. 
A) hydrogen. 
B) nitrogen. 
C) water vapor. 
D) carbon dioxide. 
E) mixtures of these.

Question 2

Meteorites have been found to contain

Accepted Answer

A) simple sugars. 
B) fatty acids. 
C) amino acids. 
D) nucleotides. 
E) all of these. 
A) simple sugars. 
B) fatty acids. 
C) amino acids. 
D) nucleotides. 
E) all of these.

Question 3

The Mars expeditions are looking for life in which of the following?

Accepted Answer

A) air 
B) rock 
C) water 
D) subsurface soil 
E) archeological sites 
A) air 
B) rock 
C) water 
D) subsurface soil 
E) archeological sites

Question 4

The archea include which of the following?

Accepted Answer

A) extreme thermophiles 
B) alga 
C) protista 
D) animals 
E) all of these 
A) extreme thermophiles 
B) alga 
C) protista 
D) animals 
E) all of these

Question 5

The "big bang" refers to

Accepted Answer

A) an event marking the beginning of the universe. 
B) the extinction of the dinosaurs. 
C) the inevitable end of the universe. 
D) the collision of the first galaxies forming the universe as it is today. 
E) the inevitable death of large stars. 
A) an event marking the beginning of the universe. 
B) the extinction of the dinosaurs. 
C) the inevitable end of the universe. 
D) the collision of the first galaxies forming the universe as it is today. 
E) the inevitable death of large stars.

Question 6

The first eukaryotic cells had

Accepted Answer

A) a nucleus. 
B) an endomembrane system. 
C) mitochondria. 
D) chloroplasts. 
E) all of these. 
A) a nucleus. 
B) an endomembrane system. 
C) mitochondria. 
D) chloroplasts. 
E) all of these.

Question 7

The accumulation of free oxygen in the atmosphere

Accepted Answer

A) was a result of the accumulation of a by-product of a type of photosynthesis. 
B) prevented the further spontaneous generation of life. 
C) provided the opportunity to extract more energy through aerobic respiration. 
D) did not occur immediately after the earth was formed. 
E) did all of these. 
A) was a result of the accumulation of a by-product of a type of photosynthesis. 
B) prevented the further spontaneous generation of life. 
C) provided the opportunity to extract more energy through aerobic respiration. 
D) did not occur immediately after the earth was formed. 
E) did all of these.

Question 8

DNA replaced RNA as the main information molecule probably because

Accepted Answer

A) DNA contains thymine and RNA does not. 
B) DNA is double stranded and breaks less easily. 
C) DNA can store more protein-building instructions in less space. 
D) RNA is highly unstable. 
E) two of these are correct.. 
A) DNA contains thymine and RNA does not. 
B) DNA is double stranded and breaks less easily. 
C) DNA can store more protein-building instructions in less space. 
D) RNA is highly unstable. 
E) two of these are correct..

Question 9

Which of the following events is (are) related to the origin of our solar system?

Accepted Answer

A) explosions of dying stars 
B) formation of a dense cloud of dust and gas 
C) cooling of cosmic matter 
D) coalescing of cosmic matter influenced by gravity 
E) all of these 
A) explosions of dying stars 
B) formation of a dense cloud of dust and gas 
C) cooling of cosmic matter 
D) coalescing of cosmic matter influenced by gravity 
E) all of these

Question 10

Proto-cells are considered to have

Accepted Answer

A) been simple membrane-bound sacs. 
B) been able to capture energy 
C) been able to engage in metabolism. 
D) been able to reproduce. 
E) all of these. 
A) been simple membrane-bound sacs. 
B) been able to capture energy 
C) been able to engage in metabolism. 
D) been able to reproduce. 
E) all of these.

Question 11

The first cells appeared on Earth about __________ years after its crust solidified.

Accepted Answer

A) 1 billion 
B) 200 million 
C) 3.8 billion 
D) 4.5 billion 
E) a few 
A) 1 billion 
B) 200 million 
C) 3.8 billion 
D) 4.5 billion 
E) a few

Question 12

The earliest type of eukaryotic organism currently known is a type of

Accepted Answer

A) virus. 
B) bacterium. 
C) alga. 
D) animal-like protist. 
E) fungus. 
A) virus. 
B) bacterium. 
C) alga. 
D) animal-like protist. 
E) fungus.

Exam 20: The Origin and Evolution of Life

The earth's earliest atmosphere was likely composed mostly of gaseous

Meteorites have been found to contain

The Mars expeditions are looking for life in which of the following?

The archea include which of the following?

The "big bang" refers to

The first eukaryotic cells had

The accumulation of free oxygen in the atmosphere

DNA replaced RNA as the main information molecule probably because

Which of the following events is (are) related to the origin of our solar system?

Proto-cells are considered to have

The first cells appeared on Earth about __________ years after its crust solidified.

The earliest type of eukaryotic organism currently known is a type of

Invitation to Biology

Lifes Chemical Basis

Molecules of Life

Cell Structure and Function

A Closer Look at Cell Membranes

Ground Rules of Metabolism

Where It Startsphotosynthesis

Energy-Releasing Pathways

How Cells Reproduce

Meiosis and Sexual Reproduction

Observing Patterns in Inherited Traits

Chromosomes and Human Inheritance

Dna Structure and Function

From Dna to Protein

Controls Over Genes

Recombinant Dna and Genetic Engineering

The Macroevolutionary Puzzle

Emergence of Evolutionary Thought

Organizing Information About Species

Viruses and Prokaryotes

Protists the Simplest Eukaryotes

Plants

Fungi

Animals: the Invertebrates

Animal Evolution the Chordates

Human Evolution: a Case Study

Plant Tissues

Plant Nutrition and Transport

Plant Reproduction

Plant Growth and Development

Animal Tissues and Organ Systems

Neural Control

Sensory Perception

Endocrine Control

Protection, Support, and Movement

Circulation

Immunity

Respiration

Digestion and Human Nutrition

Maintaining the Internal Environment

Animal Reproductive Systems

Animal Development

Animal Behavior

Population Ecology

Community Structure and Biodiversity

Ecosystems

The Biosphere

Human Impacts on the Biosphere

Filters