Question 1

What occurred approximately 500 million years ago?

Accepted Answer

A)  the extinction of the dinosaurs 
B)  the Cambrian explosion 
C)  the rise of mammals 
D)  the birth of the first humans 
A)  the extinction of the dinosaurs 
B)  the Cambrian explosion 
C)  the rise of mammals 
D)  the birth of the first humans

Question 2

As the Sun evolves into a red giant,where will we need to move to within our Solar System if humanity still exists?

Accepted Answer

A)  Mars 
B)  Mercury 
C)  our Moon 
D)  the moons of the outer planets 
A)  Mars 
B)  Mercury 
C)  our Moon 
D)  the moons of the outer planets

Question 3

Describe the experiments of Harold Urey and Stanley Miller in understanding the origins of life.

Accepted Answer

Harold Urey and Stanley Miller performed

Question 4

Which of the following is the study of the origin,evolution,distribution,and future of life in the universe?

Accepted Answer

A)  astrobiology 
B)  biology 
C)  cosmology 
D)  physiology 
A)  astrobiology 
B)  biology 
C)  cosmology 
D)  physiology

Question 5

Why would the 21-cm line be a good place to search for signals from intelligent life in the universe?

Accepted Answer

Other civilizations might decide to send

Question 6

NASA spacecraft have found good evidence that liquid water in large amounts previously existed on the surface of:

Accepted Answer

A)  Mars. 
B)  Mercury. 
C)  Titan. 
D)  Venus. 
A)  Mars. 
B)  Mercury. 
C)  Titan. 
D)  Venus.

Question 7

Complex microorganisms that have complex DNA enclosed in a cell nucleus are called:

Accepted Answer

A)  algae. 
B)  bacteria. 
C)  eukaryotes. 
D)  prokaryotes. 
A)  algae. 
B)  bacteria. 
C)  eukaryotes. 
D)  prokaryotes.

Question 8

If the entire history of Earth were scaled to fit into 1 day,what time of day would microorganisms first form,oxygen start becoming a significant component of the atmosphere,and humans split off from their genetic ancestors?

Accepted Answer

Earth is 4.5 billion years old.Microbes

Question 9

Why does a planet's size matter when predicting if it can support life?

Accepted Answer

A)  Gravity will determine if a planet can retain an atmosphere. 
B)  Large worlds are most likely to have life based on our own Solar System. 
C)  Only very large worlds have atmospheres. 
D)  Water only exists on very large planets. 
A)  Gravity will determine if a planet can retain an atmosphere. 
B)  Large worlds are most likely to have life based on our own Solar System. 
C)  Only very large worlds have atmospheres. 
D)  Water only exists on very large planets.

Question 10

If we model the age of the universe as a single day,at what time would the earliest traces of humanity appear on Earth?

Accepted Answer

A)  11:00:00 P.M. 
B)  11:35:00 P.M. 
C)  11:53:10 P.M. 
D)  11:59:25 P.M. 
A)  11:00:00 P.M. 
B)  11:35:00 P.M. 
C)  11:53:10 P.M. 
D)  11:59:25 P.M.

Question 11

What are the four main chemicals that make up all living organisms on Earth?

Accepted Answer

CHON: carb

Question 12

Venus and Mars have little free oxygen in their atmospheres.What has allowed Earth to have a large amount of oxygen in its atmosphere?

Accepted Answer

A)  bombardment 
B)  cyanobacteria and other photosynthesizing organisms 
C)  volcanism 
D)  water on Earth's surface 
A)  bombardment 
B)  cyanobacteria and other photosynthesizing organisms 
C)  volcanism 
D)  water on Earth's surface

Question 13

The phylogenetic tree of life was established using:

Accepted Answer

A)  bacteria. 
B)  DNA sequencing. 
C)  fossils. 
D)  fungi. 
A)  bacteria. 
B)  DNA sequencing. 
C)  fossils. 
D)  fungi.

Question 14

Where do we think life first formed on Earth?

Accepted Answer

A)  in the air 
B)  in the oceans 
C)  on land 
D)  on asteroids that carried microorganisms to Earth 
A)  in the air 
B)  in the oceans 
C)  on land 
D)  on asteroids that carried microorganisms to Earth

Question 15

We search for intelligent life in the universe by:

Accepted Answer

A)  sending out spacecraft with messages on them. 
B)  using radio telescopes to search for radio signals. 
C)  monitoring ultraviolet radiation emitted by stars. 
D)  all of the above 
A)  sending out spacecraft with messages on them. 
B)  using radio telescopes to search for radio signals. 
C)  monitoring ultraviolet radiation emitted by stars. 
D)  all of the above

What occurred approximately 500 million years ago?

As the Sun evolves into a red giant,where will we need to move to within our Solar System if humanity still exists?

Describe the experiments of Harold Urey and Stanley Miller in understanding the origins of life.

Which of the following is the study of the origin,evolution,distribution,and future of life in the universe?

Why would the 21-cm line be a good place to search for signals from intelligent life in the universe?

NASA spacecraft have found good evidence that liquid water in large amounts previously existed on the surface of:

Complex microorganisms that have complex DNA enclosed in a cell nucleus are called:

If the entire history of Earth were scaled to fit into 1 day,what time of day would microorganisms first form,oxygen start becoming a significant component of the atmosphere,and humans split off from their genetic ancestors?

Why does a planet's size matter when predicting if it can support life?

If we model the age of the universe as a single day,at what time would the earliest traces of humanity appear on Earth?

What are the four main chemicals that make up all living organisms on Earth?

Venus and Mars have little free oxygen in their atmospheres.What has allowed Earth to have a large amount of oxygen in its atmosphere?

The phylogenetic tree of life was established using:

Where do we think life first formed on Earth?

We search for intelligent life in the universe by:

Thinking Like an Astronomer

Patterns in the Skymotions of Earth and the Moon

Laws of Motion

Light and Telescopes

The Formation of Stars and Planets

Terrestrial Worlds in the Inner Solar System

Atmospheres of Venus, earth, and Mars

The Giant Planets

Small Bodies of the Solar System

Measuring the Stars

Our Star: the Sun

Evolution of Low-Mass Stars

Evolution of High-Mass Stars

Measuring Galaxies

Our Galaxy: the Milky Way

The Evolution of the Universe

Formation of Structure

Filters

Exam 18: Life in the Universe

What occurred approximately 500 million years ago?

As the Sun evolves into a red giant,where will we need to move to within our Solar System if humanity still exists?

Describe the experiments of Harold Urey and Stanley Miller in understanding the origins of life.

Which of the following is the study of the origin,evolution,distribution,and future of life in the universe?

Why would the 21-cm line be a good place to search for signals from intelligent life in the universe?

NASA spacecraft have found good evidence that liquid water in large amounts previously existed on the surface of:

Complex microorganisms that have complex DNA enclosed in a cell nucleus are called:

If the entire history of Earth were scaled to fit into 1 day,what time of day would microorganisms first form,oxygen start becoming a significant component of the atmosphere,and humans split off from their genetic ancestors?

Why does a planet's size matter when predicting if it can support life?

If we model the age of the universe as a single day,at what time would the earliest traces of humanity appear on Earth?

What are the four main chemicals that make up all living organisms on Earth?

Venus and Mars have little free oxygen in their atmospheres.What has allowed Earth to have a large amount of oxygen in its atmosphere?

The phylogenetic tree of life was established using:

Where do we think life first formed on Earth?

We search for intelligent life in the universe by:

Thinking Like an Astronomer

Patterns in the Skymotions of Earth and the Moon

Laws of Motion

Light and Telescopes

The Formation of Stars and Planets

Terrestrial Worlds in the Inner Solar System

Atmospheres of Venus, earth, and Mars

The Giant Planets

Small Bodies of the Solar System

Measuring the Stars

Our Star: the Sun

Evolution of Low-Mass Stars

Evolution of High-Mass Stars

Measuring Galaxies

Our Galaxy: the Milky Way

The Evolution of the Universe

Formation of Structure

Filters