Question 1

In all living things on Earth, the chemical reactions making, breaking, and combining carbon chains take place in _______________ within the cell of living organisms.

Accepted Answer

The answer of In all living things on Earth, the...

Question 2

A(n) _______________ can thrive in extreme conditions, such as ice-covered lakes in Antarctica, far underground inside solid rock, amongst the cinders of summits of extinct volcanoes, or in pools of acids.

Accepted Answer

The answer of A(n) _______________ can thrive in extreme conditions,...

Question 3

Was oxygen a part of Earth's early atmosphere? Explain how today's atmosphere evolved to support life.

Accepted Answer

No, it is hypothesized that Earth's earl

Question 4

Astronomers have defined a(n) _______________ around a star as a region within which planets that orbit there have temperatures permitting the existence of liquid water.

Accepted Answer

The answer of Astronomers have defined a(n) _______________ around a...

Question 5

Half the stars in the Milky Way Galaxy are members of a binary system, many of which are likely to support life on planets.

Accepted Answer

A) True 
 B)False

Question 6

Why do astronomers narrow their search to the "habitable zone" of other star systems?

Accepted Answer

A)  the most likely place to support planets with thick atmospheres 
B)  the least likely place to have zero ultraviolet radiation 
C)  the most likely place with liquid water, and extraterrestrial life 
D)  the most likely place to have oxygen in the atmosphere 
E)  the least likely place to have wide temperature ranges on the surfaces of planets 
A)  the most likely place to support planets with thick atmospheres 
B)  the least likely place to have zero ultraviolet radiation 
C)  the most likely place with liquid water, and extraterrestrial life 
D)  the most likely place to have oxygen in the atmosphere 
E)  the least likely place to have wide temperature ranges on the surfaces of planets

Question 7

A low-luminosity star has a small and narrow ____, whereas a high-luminosity star has a large and wide one.

Accepted Answer

A)  UV range 
B)  life capability 
C)  habitable zone 
D)  adaptable zone 
E)  water hole 
A)  UV range 
B)  life capability 
C)  habitable zone 
D)  adaptable zone 
E)  water hole

Question 8

Earth sends out more signals into space by accident than with intent.

Accepted Answer

A) True 
 B)False

Question 9

Earth required only 1 million years to produce the first cells and another million years for intelligence to emerge.

Accepted Answer

A) True 
 B)False

Question 10

What makes silicon an unlikely source as the basis of life?

Accepted Answer

Though similar in structure to carbon an

Question 11

What was needed to develop in Earth's atmosphere to protect organisms from the harmful effects of ultraviolet radiation?

Accepted Answer

A)  weather patterns 
B)  a nitrogenous layer 
C)  a greenhouse effect 
D)  an ozone layer 
E)  reflective clouds 
A)  weather patterns 
B)  a nitrogenous layer 
C)  a greenhouse effect 
D)  an ozone layer 
E)  reflective clouds

Question 12

What organism today is most similar to the first cells on Earth?

Accepted Answer

A)  diatoms 
B)  protists 
C)  insects 
D)  bacteria 
E)  yeast 
A)  diatoms 
B)  protists 
C)  insects 
D)  bacteria 
E)  yeast

Question 13

What technology do astronomers use to search for extraterrestrial life?

Accepted Answer

A)  space observatories 
B)  radio telescopes 
C)  refracting telescopes 
D)  reflecting telescopes 
E)  FM radio and televisions 
A)  space observatories 
B)  radio telescopes 
C)  refracting telescopes 
D)  reflecting telescopes 
E)  FM radio and televisions

Question 14

Molecular biologists must determine the order in which the ____ occur along the DNA ladder.

Accepted Answer

A)  base pairs 
B)  RNA strands 
C)  chromosome strands 
D)  carbon atoms 
E)  genetic coding 
A)  base pairs 
B)  RNA strands 
C)  chromosome strands 
D)  carbon atoms 
E)  genetic coding

Question 15

What was Miller and Urey trying to replicate in their experiment?

Accepted Answer

A)  the formation of cell 
B)  the formation of ozone 
C)  the formation of photosynthesis 
D)  the formation of organic molecules 
E)  the formation of liquid water 
A)  the formation of cell 
B)  the formation of ozone 
C)  the formation of photosynthesis 
D)  the formation of organic molecules 
E)  the formation of liquid water

Question 16

What is the radio window astronomers use to search for alien transmitted communication? What is this window nicknamed?

Accepted Answer

Between 1cm to 30 cm wavelengths is a ra

Question 17

Why couldn't life originate on the Moon?

Accepted Answer

A)  too many craters 
B)  not within a habitable zone in the Solar System 
C)  lack of atmosphere to keep water on its surface 
D)  lack of oxygen in its atmosphere 
E)  too cold a surface 
A)  too many craters 
B)  not within a habitable zone in the Solar System 
C)  lack of atmosphere to keep water on its surface 
D)  lack of oxygen in its atmosphere 
E)  too cold a surface

Question 18

As Earth evolved with life, an oxygen abundance of only 0.1 percent would have created a(n) _______________, protecting organisms from the Sun's ultraviolet radiation.

Accepted Answer

ozone laye

Question 19

Why couldn't life have originated on the Moon or Mercury?

Accepted Answer

For life to begin, liquid wate

Question 20

In 1974, astronomers broadcasted a radio message of greeting towards the globular cluster M13, 25,000 light-years away.

Accepted Answer

A) True 
 B)False

Exam 26: Astrobiology

In all living things on Earth, the chemical reactions making, breaking, and combining carbon chains take place in _______________ within the cell of living organisms.

A(n) _______________ can thrive in extreme conditions, such as ice-covered lakes in Antarctica, far underground inside solid rock, amongst the cinders of summits of extinct volcanoes, or in pools of acids.

Was oxygen a part of Earth's early atmosphere? Explain how today's atmosphere evolved to support life.

Astronomers have defined a(n) _______________ around a star as a region within which planets that orbit there have temperatures permitting the existence of liquid water.

Half the stars in the Milky Way Galaxy are members of a binary system, many of which are likely to support life on planets.

Why do astronomers narrow their search to the "habitable zone" of other star systems?

A low-luminosity star has a small and narrow ____, whereas a high-luminosity star has a large and wide one.

Earth sends out more signals into space by accident than with intent.

Earth required only 1 million years to produce the first cells and another million years for intelligence to emerge.

What makes silicon an unlikely source as the basis of life?

What was needed to develop in Earth's atmosphere to protect organisms from the harmful effects of ultraviolet radiation?

What organism today is most similar to the first cells on Earth?

What technology do astronomers use to search for extraterrestrial life?

Molecular biologists must determine the order in which the ____ occur along the DNA ladder.

What was Miller and Urey trying to replicate in their experiment?

What is the radio window astronomers use to search for alien transmitted communication? What is this window nicknamed?

Why couldn't life originate on the Moon?

As Earth evolved with life, an oxygen abundance of only 0.1 percent would have created a(n) _______________, protecting organisms from the Sun's ultraviolet radiation.

Why couldn't life have originated on the Moon or Mercury?

In 1974, astronomers broadcasted a radio message of greeting towards the globular cluster M13, 25,000 light-years away.

Here and Now

A Users Guide to the Sky

Moon Phases and Eclipses

Origins of Modern Astronomy

Gravity

Light and Telescopes

Atoms and Spectra

The Sun

The Family of Stars

The Interstellar Medium

Formation and Structure of Stars

Stellar Evolution

Deaths of Stars

Neutron Stars and Black Holes

The Milky Way Galaxy

Galaxies

Supermassive Black Holes and Active Galaxies

Modern Cosmology

Origin of the Solar System and Extrasolar Planets

Earth the Active Planet

The Moon and Mercury

Venus and Mars

Jupiter and Saturn

Uranus Neptune Pluto and the Kuiper Belt

Meteorites Asteroids and Comets

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