Download EOC Biology Practice 9D

EOC Biology Practice 9D
Multiple Choice
Identify the choice that best completes the statement or answers the question.
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1. American scientists Stanley Miller and Harold Urey used an apparatus similar to the one in the diagram to
simulate how life could have formed on Earth. The apparatus contained hydrogen gas, water vapor, ammonia,
and methane. These gases were subjected to a spark, to simulate lightning. They found that organic molecules
could form from the inorganic gases. Their theory of how life began, however, did not hold up under further
testing. What crucial fact did they not have when they conducted their experiment?
A
B
C
D
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There was no lightning in Earth’s early atmosphere.
Ammonia and methane were not in the early atmosphere.
The chemicals used in the experiment were contaminated.
Organic molecules already existed before the atmosphere formed.
2. The Miller-Urey experiment showed that, under certain conditions, organic compounds could form from
inorganic molecules. What is one consequence of this experiment?
A Scientists think that life could not have developed through natural chemical and physical
processes.
B The experiment proved that methane and ammonia will always give rise to organic
molecules in any circumstance.
C Scientists think it is possible that organic compounds formed from the inorganic
compounds present on Earth billions of years ago.
D The experiment used the exact inorganic compounds present on Earth billions of years ago
and left little doubt about the mechanism of early life.
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3. The bubble model states that that the key processes that formed the chemicals needed for life took place within
bubbles beneath the ocean’s surface. What important role did bubbles play according to the bubble model?
A They provided protection from damaging ultraviolet radiation.
B They allowed the reactions to take place in the presence of oxygen.
C They kept the chemical products from ever entering Earth’s atmosphere.
D They gave the activation energy needed for spontaneous chemical reactions.
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4. What did the Miller-Urey experiment show?
A Certain lipids, when combined with other molecules, can form a tiny droplet that has a
surface that resembles a cell membrane.
B The heat from hydrothermal vents could have provided energy for chemical reactions on
early Earth.
C Within the sea, biological molecules would have been protected from harmful solar
radiation.
D Under specific conditions, organic compounds can form from inorganic molecules.
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5. Which of the following was made by Miller and Urey in the laboratory?
A
B
C
D
amino acids
urea
DNA
RNA
EOC Biology Practice 9D
Answer Section
MULTIPLE CHOICE
1.
2.
3.
4.
5.
ANS:
ANS:
ANS:
ANS:
ANS:
B
C
A
D
A
PTS:
PTS:
PTS:
PTS:
PTS:
1
1
1
1
1
STA:
STA:
STA:
STA:
STA:
1.B.9.D
1.B.9.D
1.B.9.D
BIO.9.D
BIO.9.D