AP BIOLOGY PRACTICE EXAM
QUESTIONS WITH CORRECT ANSWERS
A student formulated a hypothesis that water-soluble pollutants damage living
organisms by increasing the permeability of cellular membranes. To test the hypothesis,
the student investigated the effect of isopropanol and acetone on beet root cells. The
vacuoles of beet root cells contain large amounts of betacyanin, a water-soluble
pigment that is released into the extracellular environment as a result of increased
membrane permeability.
The student prepared identical samples of beet root tissue and incubated each sample
for 15 minutes in the specific solution for that group. At the end of the incubation period,
the student measured the absorbance of 460 nm light for each sample. A greater
concentration of betacyanin in the solution surrounding the beet root cells results in a
greater absorbance of 460 nm light. The results of the experiment are shown in the
table above.
Based on the data from the investigation, whic - Answer-Will organisms living in polluted
environments exhibit detrimental effects from an increased permeability of their cellular
membranes?
The illustration above depicts a neuromuscular junction of a patient with an autoimmune
disorder. Acetylcholine is a stimulatory neurotransmitter. Which of the following would
be the most likely result of the continued presence of the antibody? - Answer-A
decrease in action potentials in the muscle, causing muscle weakness and fatigue
Cholesterol is an important component of animal cell membranes. Cholesterol
molecules are often delivered to body cells by the blood, which transports the molecules
in the form of cholesterol-protein complexes. The complexes must be moved into the
body cells before the cholesterol molecules can be incorporated into the phospholipid
bilayers of cell membranes.
Based on the information presented, which of the following is the most likely explanation
for a buildup of cholesterol molecules in the blood of an animal? - Answer-The animal's
body cells are defective in phospholipid synthesis.
Bacteriophages are viruses that infect bacteria. In an experiment, bacteriophages were
labeled with either radioactive phosphorus or radioactive sulfur. The labeled
bacteriophages were incubated with bacteria for a brief amount of time and then
removed. The infected bacteria cells were found to contain significant amounts of
radioactive phosphorus but not radioactive sulfur.
Based on the results of the experiment, which of the following types of molecules did
the bacteriophages most likely inject into the bacteria cells? - Answer-DNA
Which of the following questions will best direct an investigation of the mechanism of
ATP synthase? - Answer-Is the phosphorylation of ADP by ATP synthase dependent on
the formation of a proton gradient?
QUESTIONS WITH CORRECT ANSWERS
A student formulated a hypothesis that water-soluble pollutants damage living
organisms by increasing the permeability of cellular membranes. To test the hypothesis,
the student investigated the effect of isopropanol and acetone on beet root cells. The
vacuoles of beet root cells contain large amounts of betacyanin, a water-soluble
pigment that is released into the extracellular environment as a result of increased
membrane permeability.
The student prepared identical samples of beet root tissue and incubated each sample
for 15 minutes in the specific solution for that group. At the end of the incubation period,
the student measured the absorbance of 460 nm light for each sample. A greater
concentration of betacyanin in the solution surrounding the beet root cells results in a
greater absorbance of 460 nm light. The results of the experiment are shown in the
table above.
Based on the data from the investigation, whic - Answer-Will organisms living in polluted
environments exhibit detrimental effects from an increased permeability of their cellular
membranes?
The illustration above depicts a neuromuscular junction of a patient with an autoimmune
disorder. Acetylcholine is a stimulatory neurotransmitter. Which of the following would
be the most likely result of the continued presence of the antibody? - Answer-A
decrease in action potentials in the muscle, causing muscle weakness and fatigue
Cholesterol is an important component of animal cell membranes. Cholesterol
molecules are often delivered to body cells by the blood, which transports the molecules
in the form of cholesterol-protein complexes. The complexes must be moved into the
body cells before the cholesterol molecules can be incorporated into the phospholipid
bilayers of cell membranes.
Based on the information presented, which of the following is the most likely explanation
for a buildup of cholesterol molecules in the blood of an animal? - Answer-The animal's
body cells are defective in phospholipid synthesis.
Bacteriophages are viruses that infect bacteria. In an experiment, bacteriophages were
labeled with either radioactive phosphorus or radioactive sulfur. The labeled
bacteriophages were incubated with bacteria for a brief amount of time and then
removed. The infected bacteria cells were found to contain significant amounts of
radioactive phosphorus but not radioactive sulfur.
Based on the results of the experiment, which of the following types of molecules did
the bacteriophages most likely inject into the bacteria cells? - Answer-DNA
Which of the following questions will best direct an investigation of the mechanism of
ATP synthase? - Answer-Is the phosphorylation of ADP by ATP synthase dependent on
the formation of a proton gradient?
