Question 1

DNA is important to a cell because

Accepted Answer

A) DNA is the cell membrane that allows nutrients to enter the cell and wastes to leave. 
B) DNA contains the information necessary to make all of the molecules required by the organism. 
C) DNA contains the information necessary for the cell to reproduce itself. 
D) DNA is the cell membrane that allows nutrients to enter the cell and wastes to leave, DNA contains the information necessary to make all of the molecules required by the organism, and DNA contains the information necessary for the cell to reproduce itself, 
E) DNA contains the information necessary to make all of the molecules required by the organism and DNA contains the information necessary for the cell to reproduce itself. 
A) DNA is the cell membrane that allows nutrients to enter the cell and wastes to leave. 
B) DNA contains the information necessary to make all of the molecules required by the organism. 
C) DNA contains the information necessary for the cell to reproduce itself. 
D) DNA is the cell membrane that allows nutrients to enter the cell and wastes to leave, DNA contains the information necessary to make all of the molecules required by the organism, and DNA contains the information necessary for the cell to reproduce itself, 
E) DNA contains the information necessary to make all of the molecules required by the organism and DNA contains the information necessary for the cell to reproduce itself.

Question 2

Ribonucleic acid copies DNA molecules.

Accepted Answer

A) True 
 B)False

Question 3

The unit of heredity is the ____________.

Accepted Answer

The answer of The unit of heredity is the ____________....

Question 4

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 5

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 6

When a cell divides, the chromosomes split widthwise and duplicate

Accepted Answer

A) True 
 B)False

Question 7

Why are massive main-sequence stars not likely to have planets that contain life

Accepted Answer

A) The life zones around these stars is too small. 
B) These stars would sweep away all of the material from which planets could form. 
C) These stars are too hot to allow water to exist as a liquid on any planets that might form. 
D) These stars are on the main sequence for too short a time to allow life to evolve. 
E) These stars are almost always binaries and planetary orbits are unstable around binaries. 
A) The life zones around these stars is too small. 
B) These stars would sweep away all of the material from which planets could form. 
C) These stars are too hot to allow water to exist as a liquid on any planets that might form. 
D) These stars are on the main sequence for too short a time to allow life to evolve. 
E) These stars are almost always binaries and planetary orbits are unstable around binaries.

Question 8

What is ALH 84001 and why is it significant to discussions of the evolution of life

Accepted Answer

Meteorite ALH 84001 is one of a dozen me

Question 9

DNA is coiled into a tight spiral and makes up the ____________ that are the genetic material in a cell.

Accepted Answer

A) genes 
B) amino acids 
C) enzymes 
D) nucleus 
E) chromosomes 
A) genes 
B) amino acids 
C) enzymes 
D) nucleus 
E) chromosomes

Question 10

Why is it believed that life cannot evolve on a planet that orbits a spectral type A, B, or O star

Accepted Answer

A) These stars produce too much infrared radiation which would destroy carbon-based organisms. 
B) These stars have very small life zones. 
C) These stars are not capable of producing planets. 
D) These stars do not remain on the main sequence long enough for life to evolve. 
E) These stars take too long to form. 
A) These stars produce too much infrared radiation which would destroy carbon-based organisms. 
B) These stars have very small life zones. 
C) These stars are not capable of producing planets. 
D) These stars do not remain on the main sequence long enough for life to evolve. 
E) These stars take too long to form.

Question 11

Life emerged from the oceans about _________ billion years ago.

Accepted Answer

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

Question 12

Describe three things that limit travel between stars.

Accepted Answer

huge distances, fuel

Question 13

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 14

When considering the number of technologically advanced civilizations in our galaxy, it is useful to consider

Accepted Answer

A) the average life span of an alien. 
B) the average life span of the civilization. 
C) the distance to the civilization's planet. 
D) the type of advanced communication they use. 
A) the average life span of an alien. 
B) the average life span of the civilization. 
C) the distance to the civilization's planet. 
D) the type of advanced communication they use.

Question 15

-The process shown above is ____________.

Accepted Answer

A) cell splitting 
B) mutation 
C) life formation 
D) copying 
A) cell splitting 
B) mutation 
C) life formation 
D) copying

Question 16

-In the Arecibo message shown above, the yellow line leads to a yellow block, which represents ____________.

Accepted Answer

A) Earth 
B) the Sun 
C) a common shape in the universe 
D) All of the other choices are correct. 
A) Earth 
B) the Sun 
C) a common shape in the universe 
D) All of the other choices are correct.

Question 17

What part of the radio spectrum is thought most likely to be successful for communication with other civilizations Why

Accepted Answer

Because signals with wavelengths longer

Question 18

Some M dwarf stars may host planets with life.

Accepted Answer

A) True 
 B)False

Question 19

Chemical evolution concentrated the various smaller molecules into the more stable forms.

Accepted Answer

A) True 
 B)False

Question 20

What is the significance of the Miller-Urey experiment

Accepted Answer

The Miller-Urey experiment is

DNA is important to a cell because

Ribonucleic acid copies DNA molecules.

The unit of heredity is the ____________.

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

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

When a cell divides, the chromosomes split widthwise and duplicate

Why are massive main-sequence stars not likely to have planets that contain life

What is ALH 84001 and why is it significant to discussions of the evolution of life

DNA is coiled into a tight spiral and makes up the ____________ that are the genetic material in a cell.

Why is it believed that life cannot evolve on a planet that orbits a spectral type A, B, or O star

Life emerged from the oceans about _________ billion years ago.

Describe three things that limit travel between stars.

ALH 84001

When considering the number of technologically advanced civilizations in our galaxy, it is useful to consider

-The process shown above is ____________.

-In the Arecibo message shown above, the yellow line leads to a yellow block, which represents ____________.

What part of the radio spectrum is thought most likely to be successful for communication with other civilizations Why

Some M dwarf stars may host planets with life.

Chemical evolution concentrated the various smaller molecules into the more stable forms.

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

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

DNA is important to a cell because

Ribonucleic acid copies DNA molecules.

The unit of heredity is the ____________.

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

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

When a cell divides, the chromosomes split widthwise and duplicate

Why are massive main-sequence stars not likely to have planets that contain life

What is ALH 84001 and why is it significant to discussions of the evolution of life

DNA is coiled into a tight spiral and makes up the ____________ that are the genetic material in a cell.

Why is it believed that life cannot evolve on a planet that orbits a spectral type A, B, or O star

Life emerged from the oceans about _________ billion years ago.

Describe three things that limit travel between stars.

ALH 84001

When considering the number of technologically advanced civilizations in our galaxy, it is useful to consider

-The process shown above is ____________.

-In the Arecibo message shown above, the yellow line leads to a yellow block, which represents ____________.

What part of the radio spectrum is thought most likely to be successful for communication with other civilizations Why

Some M dwarf stars may host planets with life.

Chemical evolution concentrated the various smaller molecules into the more stable forms.

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

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