Question 1

The best places for life to have formed on Earth are believed to have been

Accepted Answer

A)  near the south pole in places where water is frozen solid as ice. 
B)  on the continent of Africa in the areas with no water. 
C)  in liquid water, probably in the oceans or pools of water. 
A)  near the south pole in places where water is frozen solid as ice. 
B)  on the continent of Africa in the areas with no water. 
C)  in liquid water, probably in the oceans or pools of water.

Question 2

Why must the information in a species's DNA be changeable?

Accepted Answer

The answer of Why must the information in a species's...

Question 3

The number of technological civilizations in our galaxy is limited by

Accepted Answer

A)  the number of stars in our galaxy. 
B)  the fraction of stars with planets. 
C)  the number of planets per star in habitable zones longer than a few billion years. 
D)  the fraction of suitable planets where technical life forms evolve. 
E)  all of the above. 
A)  the number of stars in our galaxy. 
B)  the fraction of stars with planets. 
C)  the number of planets per star in habitable zones longer than a few billion years. 
D)  the fraction of suitable planets where technical life forms evolve. 
E)  all of the above.

Question 4

What did Butler mean when he said, "The chicken is the egg's way of making another egg"?

Accepted Answer

When Butler said, "The chicken is the eg

Question 5

The Viking landers searched for life on ____________________.

Accepted Answer

The answer of The Viking landers searched for life on...

Question 6

It is expected that planets around high-mass main-sequence stars would be good places to search for extraterrestrial life.

Accepted Answer

A) True 
 B)False

Question 7

The wavelengths that are most likely for communication with other civilizations are those in the water hole.

Accepted Answer

A) True 
 B)False

Question 8

The oldest easily identifiable fossils appear in sedimentary rocks that formed 3.4 billion years ago during the ____________________ period.

Accepted Answer

The answer of The oldest easily identifiable fossils appear in...

Question 9

Presuming that it takes several billion years of complex live to evolve in a stable environment, the stars most likely to currently have inhabited planets with favorable conditions for life are

Accepted Answer

A)  G to K main-sequence stars. 
B)  B to A main-sequence stars. 
C)  G to K giants. 
D)  white dwarf stars 
E)  neutron stars. 
A)  G to K main-sequence stars. 
B)  B to A main-sequence stars. 
C)  G to K giants. 
D)  white dwarf stars 
E)  neutron stars.

Question 10

The first complex multicellular life forms with appendages, etc., appeared on Earth about 0.5 billion years ago during the

Accepted Answer

A)  Jurassic Period. 
B)  Mississippian Period. 
C)  Cambrian Period. 
D)  Precambrian Period. 
E)  Neolithic Period. 
A)  Jurassic Period. 
B)  Mississippian Period. 
C)  Cambrian Period. 
D)  Precambrian Period. 
E)  Neolithic Period.

Question 11

All life on Earth is based on carbon chemistry.

Accepted Answer

A) True 
 B)False

Question 12

The DNA molecules contain six different bases.

Accepted Answer

A) True 
 B)False

Question 13

A cell's DNA molecules contain its genetic material. An offspring born with altered DNA due to radioactivity, cosmic rays, or errors in reproduction

Accepted Answer

A)  is called a mutant. 
B)  is called a new species. 
C)  is more likely to survive than if its DNA were not altered. 
D)  is no different than if its DNA were unchanged. 
E)  will never be able to reproduce itself. 
A)  is called a mutant. 
B)  is called a new species. 
C)  is more likely to survive than if its DNA were not altered. 
D)  is no different than if its DNA were unchanged. 
E)  will never be able to reproduce itself.

Question 14

The Miller experiment created synthetic DNA.

Accepted Answer

A) True 
 B)False

The best places for life to have formed on Earth are believed to have been

Why must the information in a species's DNA be changeable?

The number of technological civilizations in our galaxy is limited by

What did Butler mean when he said, "The chicken is the egg's way of making another egg"?

The Viking landers searched for life on ____________________.

It is expected that planets around high-mass main-sequence stars would be good places to search for extraterrestrial life.

The wavelengths that are most likely for communication with other civilizations are those in the water hole.

The oldest easily identifiable fossils appear in sedimentary rocks that formed 3.4 billion years ago during the ____________________ period.

Presuming that it takes several billion years of complex live to evolve in a stable environment, the stars most likely to currently have inhabited planets with favorable conditions for life are

The first complex multicellular life forms with appendages, etc., appeared on Earth about 0.5 billion years ago during the

All life on Earth is based on carbon chemistry.

The DNA molecules contain six different bases.

A cell's DNA molecules contain its genetic material. An offspring born with altered DNA due to radioactivity, cosmic rays, or errors in reproduction

The Miller experiment created synthetic DNA.

Here and Now

A Users Guide to the Sky

Cycles of the Sun and Moon

The Origin of Modern Astronomy

Light and Telescopes

Atoms and Spectra

The Sun

The Family of Stars

The Formation and Structure of Stars

The Deaths of Stars

Neutron Stars and Black Holes

The Milky Way Galaxy

Galaxies: Normal and Active

Modern Cosmology

The Origin of the Solar System

Earth and Moon: Bases for Comparative Planetology

Mercury, Venus and Mars

The Outer Solar System

Meteorites, Asteroids, and Comets

Filters

Exam 20: Astrobiology: Life on Other Worlds

The best places for life to have formed on Earth are believed to have been

Why must the information in a species's DNA be changeable?

The number of technological civilizations in our galaxy is limited by

What did Butler mean when he said, "The chicken is the egg's way of making another egg"?

The Viking landers searched for life on ____________________.

It is expected that planets around high-mass main-sequence stars would be good places to search for extraterrestrial life.

The wavelengths that are most likely for communication with other civilizations are those in the water hole.

The oldest easily identifiable fossils appear in sedimentary rocks that formed 3.4 billion years ago during the ____________________ period.

Presuming that it takes several billion years of complex live to evolve in a stable environment, the stars most likely to currently have inhabited planets with favorable conditions for life are

The first complex multicellular life forms with appendages, etc., appeared on Earth about 0.5 billion years ago during the

All life on Earth is based on carbon chemistry.

The DNA molecules contain six different bases.

A cell's DNA molecules contain its genetic material. An offspring born with altered DNA due to radioactivity, cosmic rays, or errors in reproduction

The Miller experiment created synthetic DNA.

Here and Now

A Users Guide to the Sky

Cycles of the Sun and Moon

The Origin of Modern Astronomy

Light and Telescopes

Atoms and Spectra

The Sun

The Family of Stars

The Formation and Structure of Stars

The Deaths of Stars

Neutron Stars and Black Holes

The Milky Way Galaxy

Galaxies: Normal and Active

Modern Cosmology

The Origin of the Solar System

Earth and Moon: Bases for Comparative Planetology

Mercury, Venus and Mars

The Outer Solar System

Meteorites, Asteroids, and Comets

Filters