Question 1

If life is to develop on a planet, the planet must lie well outside its star's habitable zone, where water is in its icy form.

Accepted Answer

A) True 
 B)False

Question 2

The most important quantity necessary for life to form appears to be the existence of ____________ on the surface of the planet.

Accepted Answer

The answer of The most important quantity necessary for life...

Question 3

List three celestial objects in our solar system that may be good candidates for life and explain why.

Accepted Answer

Jupiter's moon Europa appears to have a

Question 4

Astrobiology is the study of biological life on planets other than Earth.

Accepted Answer

A) True 
 B)False

Question 5

The DNA molecules contain six different bases.

Accepted Answer

A) True 
 B)False

Question 6

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

Accepted Answer

Earth's environment changes continuously

Question 7

ALH 84001

Accepted Answer

A)  is a meteorite that shows possible evidence for life evolving on Mars. 
B)  is the compound used by Miller to begin his experiment to produce amino acids. 
C)  is the amino acid produced in the Miller experiment. 
D)  is the molecule that controls the reproduction of DNA within a cell. 
E)  is the molecule that acts as DNA's messenger that assembles proteins from amino acids. 
A)  is a meteorite that shows possible evidence for life evolving on Mars. 
B)  is the compound used by Miller to begin his experiment to produce amino acids. 
C)  is the amino acid produced in the Miller experiment. 
D)  is the molecule that controls the reproduction of DNA within a cell. 
E)  is the molecule that acts as DNA's messenger that assembles proteins from amino acids.

Question 8

The Viking spacecraft searched for life on Mars by looking for the effects of life on the upper atmosphere.

Accepted Answer

A) True 
 B)False

Question 9

The ____________ molecule is a long carbon-chain molecule that uses information stored in the ____________ molecule to copy the ____________ molecule.

Accepted Answer

RNA, DNA,

Question 10

Ribonucleic acid copies DNA molecules.

Accepted Answer

A) True 
 B)False

Question 11

Genetic information is stored in DNA.

Accepted Answer

A) True 
 B)False

Question 12

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 13

What is important about the habitable zone around a star that makes astronomers believe life could exist there?

Accepted Answer

A)  The level of UV radiation from the star is minimal there. 
B)  Only in the life zone can complex organic molecules be found. 
C)  Planets in the life zone will always have oxygen atmospheres. 
D)  In the life zone water can exist as a liquid. 
A)  The level of UV radiation from the star is minimal there. 
B)  Only in the life zone can complex organic molecules be found. 
C)  Planets in the life zone will always have oxygen atmospheres. 
D)  In the life zone water can exist as a liquid.

Question 14

A cell's DNA molecules contain its genetic material. The DNA molecule can be altered

Accepted Answer

A)  by chance mismatching of base pairs. 
B)  by damage from exposure to radioactivity. 
C)  if the host cell is intelligent and determines that an alteration would help the cell survive. 
D)  by chance mismatching of base pairs, by damage from exposure to radioactivity, and if the host cell is intelligent and determines that an alteration would help the cell survive. 
E)  by chance mismatching of base pairs and by damage from exposure to radioactivity. 
A)  by chance mismatching of base pairs. 
B)  by damage from exposure to radioactivity. 
C)  if the host cell is intelligent and determines that an alteration would help the cell survive. 
D)  by chance mismatching of base pairs, by damage from exposure to radioactivity, and if the host cell is intelligent and determines that an alteration would help the cell survive. 
E)  by chance mismatching of base pairs and by damage from exposure to radioactivity.

Question 15

Describe three things that limit travel between stars.

Accepted Answer

huge distances, fuel

Question 16

Life emerged from the oceans about _________ billion years ago.

Accepted Answer

The answer of Life emerged from the oceans about _________...

Question 17

The _____________ split lengthwise and duplicate when a cell divides.

Accepted Answer

The answer of The _____________ split lengthwise and duplicate when...

Question 18

Using laser beams within the solar system to find distances to celestial objects is possible but the length of time needed could be exceeding long for real communication.

Accepted Answer

A) True 
 B)False

Question 19

Life forms became large and complex during the ______________ period.

Accepted Answer

Cambrian (

Question 20

What is the significance of the Miller-Urey experiment?

Accepted Answer

The Miller-Urey experiment is

If life is to develop on a planet, the planet must lie well outside its star's habitable zone, where water is in its icy form.

The most important quantity necessary for life to form appears to be the existence of ____________ on the surface of the planet.

List three celestial objects in our solar system that may be good candidates for life and explain why.

Astrobiology is the study of biological life on planets other than Earth.

The DNA molecules contain six different bases.

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

ALH 84001

The Viking spacecraft searched for life on Mars by looking for the effects of life on the upper atmosphere.

The molecule is a long carbon-chain molecule that uses information stored in the molecule to copy the molecule.

Ribonucleic acid copies DNA molecules.

Genetic information is stored in DNA.

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

What is important about the habitable zone around a star that makes astronomers believe life could exist there?

A cell's DNA molecules contain its genetic material. The DNA molecule can be altered

Describe three things that limit travel between stars.

Life emerged from the oceans about _________ billion years ago.

The _____________ split lengthwise and duplicate when a cell divides.

Using laser beams within the solar system to find distances to celestial objects is possible but the length of time needed could be exceeding long for real communication.

Life forms became large and complex during the ______________ period.

What is the significance of the Miller-Urey experiment?

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

Origin of the Solar System and Extrasolar Planets

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

If life is to develop on a planet, the planet must lie well outside its star's habitable zone, where water is in its icy form.

The most important quantity necessary for life to form appears to be the existence of ____________ on the surface of the planet.

List three celestial objects in our solar system that may be good candidates for life and explain why.

Astrobiology is the study of biological life on planets other than Earth.

The DNA molecules contain six different bases.

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

ALH 84001

The Viking spacecraft searched for life on Mars by looking for the effects of life on the upper atmosphere.

The ____________ molecule is a long carbon-chain molecule that uses information stored in the ____________ molecule to copy the ____________ molecule.

Ribonucleic acid copies DNA molecules.

Genetic information is stored in DNA.

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

What is important about the habitable zone around a star that makes astronomers believe life could exist there?

A cell's DNA molecules contain its genetic material. The DNA molecule can be altered

Describe three things that limit travel between stars.

Life emerged from the oceans about _________ billion years ago.

The _____________ split lengthwise and duplicate when a cell divides.

Using laser beams within the solar system to find distances to celestial objects is possible but the length of time needed could be exceeding long for real communication.

Life forms became large and complex during the ______________ period.

What is the significance of the Miller-Urey experiment?

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

Origin of the Solar System and Extrasolar Planets

Earth and Moon: Bases for Comparative Planetology

Mercury, Venus, and Mars

The Outer Solar System

Meteorites, Asteroids, and Comets

Filters

The molecule is a long carbon-chain molecule that uses information stored in the molecule to copy the molecule.