Question 1

The physical basis of life is/are ____________.

Accepted Answer

A)  carbon 
B)  water 
C)  carbon and water 
D)  carbon, water, and silicon 
A)  carbon 
B)  water 
C)  carbon and water 
D)  carbon, water, and silicon

Question 2

Using the above timeline, when did the Cambrian explosion occur?

Accepted Answer

A)  500 million years ago 
B)  600 million years ago 
C)  540 million years ago 
D)  670 million years ago 
A)  500 million years ago 
B)  600 million years ago 
C)  540 million years ago 
D)  670 million years ago

Question 3

The water hole is between ____-cm to ____-cm.

Accepted Answer

The answer of The water hole is between ____-cm to...

Question 4

Explain which noise is found and which noise is eliminated in the water hole.

Accepted Answer

The noise from the Milky Way G

Question 5

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 6

What limitation(s) make it impossible to travel between stars?
I. fuel requirements
II. the tremendous distances between stars
III. the finite speed at which objects can travel

Accepted Answer

A)  I 
B)  II 
C)  III 
D)  II & III 
E)  I, II, & III 
A)  I 
B)  II 
C)  III 
D)  II & III 
E)  I, II, & III

Question 7

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)  the number of stars in our galaxy, the fraction of stars with planets, the number of planets per star in habitable zones longer than a few billion years, and the fraction of suitable planets where technical life forms evolve. 
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)  the number of stars in our galaxy, the fraction of stars with planets, the number of planets per star in habitable zones longer than a few billion years, and the fraction of suitable planets where technical life forms evolve.

Question 8

What is the difference between chemical evolution and biological evolution?

Accepted Answer

Chemical evolution is a process where mo

Question 9

What life form first appeared on Earth at the 0 mark in the timeline above?

Accepted Answer

A)  dinosaurs 
B)  microbial 
C)  mammals 
D)  humans 
A)  dinosaurs 
B)  microbial 
C)  mammals 
D)  humans

Question 10

Choose the correct terms to make the statement correct: ___ Chemical/Biological __ evolution occurs before __ chemical/biological ____ evolution.

Accepted Answer

Chemical,

Question 11

Genetic variation is not random.

Accepted Answer

A) True 
 B)False

Question 12

The habitable zone around a star is

Accepted Answer

A)  the region on a planet where conditions are acceptable for life to exist. 
B)  a region around a star where a planet's temperature would permit the existence of liquid water. 
C)  very small for a massive star. 
D)  only found around G and K stars. 
E)  a region on a young planet where amino acids can begin to form DNA molecules. 
A)  the region on a planet where conditions are acceptable for life to exist. 
B)  a region around a star where a planet's temperature would permit the existence of liquid water. 
C)  very small for a massive star. 
D)  only found around G and K stars. 
E)  a region on a young planet where amino acids can begin to form DNA molecules.

Question 13

Current searches for extraterrestrial intelligence use radio telescopes at wavelengths

Accepted Answer

A)  which must be shorter than the local wavelengths emitted by Earth's atmosphere. 
B)  which must be longer than the radio wavelength 'noise' naturally emitted by our galaxy. 
C)  which must be longer than the local wavelengths emitted by Earth's atmosphere and which must be shorter than the radio wavelength 'noise' naturally emitted by our galaxy. 
D)  Wrong! Visual light wavelengths are used because radio waves are blocked by dust between the stars. 
A)  which must be shorter than the local wavelengths emitted by Earth's atmosphere. 
B)  which must be longer than the radio wavelength 'noise' naturally emitted by our galaxy. 
C)  which must be longer than the local wavelengths emitted by Earth's atmosphere and which must be shorter than the radio wavelength 'noise' naturally emitted by our galaxy. 
D)  Wrong! Visual light wavelengths are used because radio waves are blocked by dust between the stars.

Question 14

Life began on Earth as multicellular.

Accepted Answer

A) True 
 B)False

Question 15

Some M dwarf stars may host planets with life.

Accepted Answer

A) True 
 B)False

Question 16

Cells are tiny bags of carbon.

Accepted Answer

A) True 
 B)False

Question 17

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 18

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 19

A cell's DNA molecules contain its genetic material. These molecules are constructed of

Accepted Answer

A)  amino acids. 
B)  proteins. 
C)  sugars, phosphates, and bases. 
D)  amino acids, proteins, sugars, phosphates, and bases. 
E)  None of the other choices are correct. 
A)  amino acids. 
B)  proteins. 
C)  sugars, phosphates, and bases. 
D)  amino acids, proteins, sugars, phosphates, and bases. 
E)  None of the other choices are correct.

Question 20

SETI searches for aliens.

Accepted Answer

A) True 
 B)False

The physical basis of life is/are ____________.

Using the above timeline, when did the Cambrian explosion occur?

The water hole is between -cm to -cm.

Explain which noise is found and which noise is eliminated in the water hole.

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

What limitation(s) make it impossible to travel between stars? I. fuel requirements II. the tremendous distances between stars III. the finite speed at which objects can travel

The number of technological civilizations in our galaxy is limited by

What is the difference between chemical evolution and biological evolution?

What life form first appeared on Earth at the 0 mark in the timeline above?

Choose the correct terms to make the statement correct: _ Chemical/Biological evolution occurs before chemical/biological __ evolution.

Genetic variation is not random.

The habitable zone around a star is

Current searches for extraterrestrial intelligence use radio telescopes at wavelengths

Life began on Earth as multicellular.

Some M dwarf stars may host planets with life.

Cells are tiny bags of carbon.

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

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

A cell's DNA molecules contain its genetic material. These molecules are constructed of

SETI searches for aliens.

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

The physical basis of life is/are ____________.

Using the above timeline, when did the Cambrian explosion occur?

The water hole is between ____-cm to ____-cm.

Explain which noise is found and which noise is eliminated in the water hole.

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

What limitation(s) make it impossible to travel between stars? I. fuel requirements II. the tremendous distances between stars III. the finite speed at which objects can travel

The number of technological civilizations in our galaxy is limited by

What is the difference between chemical evolution and biological evolution?

What life form first appeared on Earth at the 0 mark in the timeline above?

Choose the correct terms to make the statement correct: ___ Chemical/Biological __ evolution occurs before __ chemical/biological ____ evolution.

Genetic variation is not random.

The habitable zone around a star is

Current searches for extraterrestrial intelligence use radio telescopes at wavelengths

Life began on Earth as multicellular.

Some M dwarf stars may host planets with life.

Cells are tiny bags of carbon.

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

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

A cell's DNA molecules contain its genetic material. These molecules are constructed of

SETI searches for aliens.

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 water hole is between -cm to -cm.

Choose the correct terms to make the statement correct: _ Chemical/Biological evolution occurs before chemical/biological __ evolution.