Biological Science BSC-1005 Midterm questions with
verified answers
A lake in rural Maine drops in pH from 7 to 5 as a result of acid rain
falling into it. How has the H+ ion concentration changed as a result of
the acid rain?
A. The H+ ion concentration has increased 100 times its starting
concentration.
B. The H+ ion concentration has decreased by half its starting
concentration.
C. The H+ ion concentration has decreased by 20 times its starting
concentration.
D. The H+ ion concentration hasn't changed, but the OH- ion
concentration has doubled.
E. The H+ ion concentration has doubled its starting concentration.
Ans✓✓✓ A. The H+ ion concentration has increased 100 times its
starting concentration
A nasty trick to play on a water strider bug is to add detergent to a
puddle on which the strider is standing. Water striders are light enough
to stand on the water's surface. Adding a detergent or other surfactant
,to the puddle would cause the water strider to sink. What must a
surfactant do to change the water surface?
A. It must cause the hydrogen bonds between surface water molecules
to be broken.
B. It must cause water molecules to break apart into hydrogen and
oxygen atoms.
C. It must increase the weight of the water strider, causing it to sink.
D. It must cause the hydrogen atoms of water to become slightly
negatively charged, and the oxygen atoms to be positively charged.
E. It must deflate little air sacs on the water strider that allow it to float
on the surface Ans✓✓✓ A. It must cause the hydrogen bonds between
surface water molecules to be broken.
A partial sequence of a molecule is "AACTGCT." The molecule is:
A. a polysaccharide.
B. a protein.
,C. a nucleic acid.
D. a triglyceride.
e. an oligosaccharide. Ans✓✓✓ C. a nucleic acid.
A relationship that has been established based on a large amount of
observational and experimental data is:
A. a fact.
B. an assumption.
C. a conjecture.
D. a theory.
E. a hypothesis. Ans✓✓✓ D. a theory.
A scientist tries to build a eukaryotic cell in her laboratory. She
remembers to include most of the organelles, but forgets one. Among
other abnormalities, her newly created cell cannot synthesize the
, enzymes needed to detoxify drugs and poisons. Which organelle is
missing?
A. the Golgi apparatus
B. the mitochondria
C. the cytoskeleton
D. the smooth endoplasmic reticulum
E. the nucleus Ans✓✓✓ D. the smooth endoplasmic reticulum
About how many mitochondria might you expect to find in a single
human skin cell?
A. hundreds or thousands
B. one
C. two
D. none
verified answers
A lake in rural Maine drops in pH from 7 to 5 as a result of acid rain
falling into it. How has the H+ ion concentration changed as a result of
the acid rain?
A. The H+ ion concentration has increased 100 times its starting
concentration.
B. The H+ ion concentration has decreased by half its starting
concentration.
C. The H+ ion concentration has decreased by 20 times its starting
concentration.
D. The H+ ion concentration hasn't changed, but the OH- ion
concentration has doubled.
E. The H+ ion concentration has doubled its starting concentration.
Ans✓✓✓ A. The H+ ion concentration has increased 100 times its
starting concentration
A nasty trick to play on a water strider bug is to add detergent to a
puddle on which the strider is standing. Water striders are light enough
to stand on the water's surface. Adding a detergent or other surfactant
,to the puddle would cause the water strider to sink. What must a
surfactant do to change the water surface?
A. It must cause the hydrogen bonds between surface water molecules
to be broken.
B. It must cause water molecules to break apart into hydrogen and
oxygen atoms.
C. It must increase the weight of the water strider, causing it to sink.
D. It must cause the hydrogen atoms of water to become slightly
negatively charged, and the oxygen atoms to be positively charged.
E. It must deflate little air sacs on the water strider that allow it to float
on the surface Ans✓✓✓ A. It must cause the hydrogen bonds between
surface water molecules to be broken.
A partial sequence of a molecule is "AACTGCT." The molecule is:
A. a polysaccharide.
B. a protein.
,C. a nucleic acid.
D. a triglyceride.
e. an oligosaccharide. Ans✓✓✓ C. a nucleic acid.
A relationship that has been established based on a large amount of
observational and experimental data is:
A. a fact.
B. an assumption.
C. a conjecture.
D. a theory.
E. a hypothesis. Ans✓✓✓ D. a theory.
A scientist tries to build a eukaryotic cell in her laboratory. She
remembers to include most of the organelles, but forgets one. Among
other abnormalities, her newly created cell cannot synthesize the
, enzymes needed to detoxify drugs and poisons. Which organelle is
missing?
A. the Golgi apparatus
B. the mitochondria
C. the cytoskeleton
D. the smooth endoplasmic reticulum
E. the nucleus Ans✓✓✓ D. the smooth endoplasmic reticulum
About how many mitochondria might you expect to find in a single
human skin cell?
A. hundreds or thousands
B. one
C. two
D. none
