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Exam (elaborations) ASTRONOMY 2021 ASTRO exam 2 quiz bank
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ASTRONOMY 2021 ASTRO exam 2 quiz bank[13-03-16 12:06:57 AM] Scott Kennedy: Partie 1 de 5 - 5.1: Defining Life 3.0/ 3.0
Points
Question 1 de 11
1.0/ 1.0 Points
Different dog breeds have been bred by humans from a common ancestor over
the past few thousand years. This is an example of
A. un-natural selection
B. natural selection
C. artificial selection
D. artificial insemination
Clé de correction: C
Question 2 de 11
1.0/ 1.0 Points
Energy utilization in living organisms is
A. neither a necessary nor a sufficient condition for life
B. not important for organisms that have adapted to survive extremely
low temperatures (psychrophiles)
C. only important for organisms like plants which receive their energy
directly from the Sun
D. one of the most basic requirements of life, without which organisms could
not maintain order, grow, and reproduce
Clé de correction: D
Question 3 de 11
1.0/ 1.0 Points
The different species of finches found on the Galapagos islands are evidence of
Darwin's theory of natural selection because
A. all species are competing for the same resources
B. they are capable of interbreeding with each other
C. they have all evolved adaptations from a common ancestor to suit
the environmental conditions found on different islands
D. some species are more successful than others
, ASTRONOMY 2021 ASTRO exam 2 quiz bank
Clé de correction: C
Partie 2 de 5 - 5.2: Cells 4.0/ 4.0 Points
Question 4 de 11
1.0/ 1.0 Points
What is the MOST important role that proteins play in living organisms on Earth?
A. basic functioning of living organisms
B. short-term energy storage and cell structure
C. information storage
D. long-term energy storage and cell
membranes Clé de correction: A
Question 5 de 11
1.0/ 1.0 Points
Enzymes are examples of
A. lipids
B. carbohydrates
C. nucleic acids
D. proteins
Clé de correction: D
Question 6 de 11
1.0/ 1.0 Points
Which of the following observations is consistent with the hypothesis that all life
on Earth has a common ancestor?
A. all proteins are made of amino acids
B. different organisms use different sets of amino acids
C. different organisms use the same set of amino acids
D. some organisms don't use amino acids at
all Clé de correction: C
Question 7 de 11
1.0/ 1.0 Points
, ASTRONOMY 2021 ASTRO exam 2 quiz bank
Why might we think that silicon would be an obvious alternative to carbon as a
building block for biological molecules?
A. it has a similar abundance on Earth to carbon
B. it has a similar electronic structure to carbon, forming a maximum of
four bonds and, hence, should have a similar chemistry
C. it forms the basis of some life forms on Earth
D. it forms complex molecules like
carbon Clé de correction: B
Partie 3 de 5 - 5.4: DNA 0.0/ 1.0 Points
Question 8 de 11
0.0/ 1.0 Points
A section of DNA that corresponds to a particular protein is known as a
A. genome
B. gene
C. chromosome
D. codon
Clé de correction: B
Partie 4 de 5 - 5.3: Metabolism 2.0/ 2.0 Points
Question 9 de 11
1.0/ 1.0 Points
A chemoheterotroph gets is energy from
A. chemical reactions and its carbon from other organisms
B. the Sun and its carbon from its environment
C. the Sun and its carbon from other organisms
D. chemical reactions and its carbon from its
environment Clé de correction: A
Question 10 de 11
1.0/ 1.0 Points
A photoautotroph gets its energy from
, ASTRONOMY 2021 ASTRO exam 2 quiz bank
A. chemical reactions and its carbon from its environment
B. chemical reactions and its carbon from other organisms
C. the Sun and its carbon from its environment
D. the Sun and its carbon from other
organisms Clé de correction: C
Partie 5 de 5 - 5.5: Extreme 1.0/ 1.0 Points
Question 11 de 11
1.0/ 1.0 Points
The discovery of extremophiles on Earth suggests that
A. life elsewhere may be possible over a much wider range of conditions
than initially thought
B. extraterrestrial life will exist only under extreme conditions
C. life elsewhere will only be found under conditions that are similar to those
of Earth
D. life elsewhere will only be possible over a much narrower range of
conditions than initially thought
Clé de correction: A
[13-03-16 12:07:24 AM] Scott Kennedy: Question 1 de 13
1.0/ 1.0 Points
A sample of an ancient sedimentary rock contains slightly less of the
isotope carbon-13 than normal. One possible explanation for this is that
A. it was a meteorite that fell from the sky
B. some kind of biological activity occurred in it in the past
C. it used to be at the bottom of an ancient ocean
D. some kind of radioactive decay occurred in it in the
past Clé de correction: B
Question 2 de 13
0.0/ 1.0 Points
The study of stromatolites tells us that the origin of life on Earth must have
ocurred
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