Question 1

Why was the comet impact a chance happening that benefited the evolution of humans?

Accepted Answer

A)  It deposited a significant amount of nitrogen into the Earth's atmosphere. 
B)  It led to an increase in global UV radiation,which killed off most of the forests and jungles. 
C)  Mammals got an evolutionary boost. 
D)  Plant life began to decline. 
A)  It deposited a significant amount of nitrogen into the Earth's atmosphere. 
B)  It led to an increase in global UV radiation,which killed off most of the forests and jungles. 
C)  Mammals got an evolutionary boost. 
D)  Plant life began to decline.

Question 2

If we model the age of the universe as a single day,at what time would the earliest traces of humanity appear on the Earth?

Accepted Answer

A)  11:00:00 P.M. 
B)  11:35:00 P.M. 
C)  11:53:10 P.M. 
D)  11:59:25 P.M. 
A)  11:00:00 P.M. 
B)  11:35:00 P.M. 
C)  11:53:10 P.M. 
D)  11:59:25 P.M.

Question 3

What are the four main chemicals that make up all living organisms on the Earth?

Accepted Answer

CHON: carb

Question 4

If we model the history of the Earth as a single day,at what time would the first human civilizations appear?

Accepted Answer

A)  0.2 seconds before midnight 
B)  2 minutes before midnight 
C)  10:00 P.M. 
D)  6:00 P.M. 
A)  0.2 seconds before midnight 
B)  2 minutes before midnight 
C)  10:00 P.M. 
D)  6:00 P.M.

Question 5

In 1952,chemists Harold Urey and Stanley Miller mixed ammonia,methane,and hydrogen in a closed container,zapped it with electrical sparks and found that

Accepted Answer

A)  they could induce cold fusion to occur. 
B)  they could not induce any amino acids to form. 
C)  single-celled microorganisms had been spontaneously created. 
D)  they had created about half the amino acids contained in DNA. 
A)  they could induce cold fusion to occur. 
B)  they could not induce any amino acids to form. 
C)  single-celled microorganisms had been spontaneously created. 
D)  they had created about half the amino acids contained in DNA.

Question 6

The main goal of the Allen Telescope Array is to search for high redshift galaxies.

Accepted Answer

A) True 
 B)False

Question 7

A value of   for the Drake equation signifies that

Accepted Answer

A)  1 out of every 10 solar systems in our galaxy harbors intelligent life. 
B)  1 out of every 10 solar systems in our galaxy harbors life of some kind. 
C)  1 out of every 10 galaxies in our universe harbors intelligent life. 
D)  1 out of every 10 galaxies in our universe harbors life of some kind. 
A)  1 out of every 10 solar systems in our galaxy harbors intelligent life. 
B)  1 out of every 10 solar systems in our galaxy harbors life of some kind. 
C)  1 out of every 10 galaxies in our universe harbors intelligent life. 
D)  1 out of every 10 galaxies in our universe harbors life of some kind.

Question 8

What would be the number of intelligent civilizations in our galaxy if all stars formed planets,each planet has a 0.1 percent change of supporting life,and every time conditions are right life develops,but only 0.001 percent of the time intelligent life develops,and once it develops it survives indefinitely?

Accepted Answer

The Drake equation s

Question 9

Scientists have shown that ammonia and methane,mixed together with either hydrogen,carbon dioxide,or nitrogen,and exposed to electrical sparks,can produce some of the amino acids essential for life.

Accepted Answer

A) True 
 B)False

Question 10

SETI's Allen Telescope Array is designed to search __________ for signs of intelligent life.

Accepted Answer

A)  over a thousand stars 
B)  over a million stars 
C)  galaxies in the Local Group 
D)  the 100 closest spiral galaxies 
A)  over a thousand stars 
B)  over a million stars 
C)  galaxies in the Local Group 
D)  the 100 closest spiral galaxies

Question 11

The habitable zone for a   star ranges from 0.9 to 1.4 AU from the star.

Accepted Answer

A) True 
 B)False

Question 12

As living organisms evolved to become more complex during the history of the Earth,did this violate the second law of thermodynamics?

Accepted Answer

As a specific organism evolved

Question 13

We search for intelligent life in the universe by

Accepted Answer

A)  sending out spacecraft with messages on them. 
B)  using radio telescopes to search for radio signals. 
C)  monitoring ultraviolet radiation emitted by stars. 
D)  All of the above 
A)  sending out spacecraft with messages on them. 
B)  using radio telescopes to search for radio signals. 
C)  monitoring ultraviolet radiation emitted by stars. 
D)  All of the above

Question 14

The four main chemicals of which life on Earth are composed are hydrogen,carbon,oxygen,and sulfur.

Accepted Answer

A) True 
 B)False

Question 15

Complex microorganisms that have complex DNA enclosed in a cell nucleus are called

Accepted Answer

A)  algae. 
B)  bacteria. 
C)  eukaryotes. 
D)  prokaryotes. 
A)  algae. 
B)  bacteria. 
C)  eukaryotes. 
D)  prokaryotes.

Question 16

If a mutation occurred and spawned a population B that had a 25 percent higher chance of reproducing than the original population A,in how many generations would B make up 90 percent of the total population?

Accepted Answer

A)  8 
B)  16 
C)  20 
D)  24 
A)  8 
B)  16 
C)  20 
D)  24

Question 17

Why would the 21-cm line be a good place to search for signals from intelligent life in the universe?

Accepted Answer

Other civilizations might decide to send

Question 18

Calculate the maximum likelihood that any technically advanced civilization that arose still exists in our galaxy today.

Accepted Answer

The maximum value of L is simply the lif

Question 19

Based on what you know of the Earth's evolution,what percent of Earth-like planets in a star cluster with an age of 2 billion years has intelligent life?

Accepted Answer

A)  0 
B)  10 percent 
C)  30 percent 
D)  50 percent 
A)  0 
B)  10 percent 
C)  30 percent 
D)  50 percent

Question 20

What occurred approximately 500 million years ago?

Accepted Answer

A)  The extinction of the dinosaurs 
B)  The Cambrian explosion 
C)  The rise of mammals 
D)  The birth of the first humans 
A)  The extinction of the dinosaurs 
B)  The Cambrian explosion 
C)  The rise of mammals 
D)  The birth of the first humans

Exam 23: Life

Why was the comet impact a chance happening that benefited the evolution of humans?

If we model the age of the universe as a single day,at what time would the earliest traces of humanity appear on the Earth?

What are the four main chemicals that make up all living organisms on the Earth?

If we model the history of the Earth as a single day,at what time would the first human civilizations appear?

In 1952,chemists Harold Urey and Stanley Miller mixed ammonia,methane,and hydrogen in a closed container,zapped it with electrical sparks and found that

The main goal of the Allen Telescope Array is to search for high redshift galaxies.

A value of for the Drake equation signifies that

Scientists have shown that ammonia and methane,mixed together with either hydrogen,carbon dioxide,or nitrogen,and exposed to electrical sparks,can produce some of the amino acids essential for life.

SETI's Allen Telescope Array is designed to search __________ for signs of intelligent life.

The habitable zone for a star ranges from 0.9 to 1.4 AU from the star.

As living organisms evolved to become more complex during the history of the Earth,did this violate the second law of thermodynamics?

We search for intelligent life in the universe by

The four main chemicals of which life on Earth are composed are hydrogen,carbon,oxygen,and sulfur.

Complex microorganisms that have complex DNA enclosed in a cell nucleus are called

If a mutation occurred and spawned a population B that had a 25 percent higher chance of reproducing than the original population A,in how many generations would B make up 90 percent of the total population?

Why would the 21-cm line be a good place to search for signals from intelligent life in the universe?

Calculate the maximum likelihood that any technically advanced civilization that arose still exists in our galaxy today.

Based on what you know of the Earth's evolution,what percent of Earth-like planets in a star cluster with an age of 2 billion years has intelligent life?

What occurred approximately 500 million years ago?

Why Learn Astronomy

Patterns in the Skymotions of Earth

Gravity and Orbitsa Celestial Ballet

Light

The Tools of the Astronomer

The Birth and Evolution of Planetary Systems

The Terrestrial Planets and Earths Moon

Atmospheres of the Terrestrial Planets

Worlds of Gas and Liquidthe Giant Planets

Gravity Is More Than Keplers Laws

Planetary Adornmentsmoons and Rings

Dwarf Planets and Small Solar System Bodies

Taking the Measure of Stars

A Run-Of-The-Mill G-Type Starour Sun

Star Formation and the Interstellar Medium

Stars in the Slow Lanelow-Mass Stellar Evolution

Live Fast,die Younghigh-Mass Stellar Evolution

Our Expanding Universe

Galaxies

The Milky Waya Normal Spiral Galaxy

Modern Cosmology

The Origin of Structure

Filters