LS7A: Final Exam Questions with
Complete Solutions Graded A+
c and a - Answer In lab, a dialysis tube is filled with a 15% sucrose solution, sealed, and
placed in an unlabeled beaker filled with clear liquid. The dialysis tube is made of a
semipermeable membrane that allows the free passage of water, but is not permeable to
sucrose. After 2 hours, the bag in the beaker decreases in size and becomes flaccid. This
observation suggests that at the beginning of the experiment, the solution in the bag was
__________________ compared to the solution in the beaker.
a) isotonic
b) hypertonic
c) hypotonic
Based on this observation, the contents of the beaker could have been:
a) 25% sucrose.
b) 5% sucrose.
c) 15% sucrose.
b - Answer Which of the following eukaryotic cell structures plays a role in protein trafficking
and sorting?
a) vacuoles
b) the Golgi Apparatus
c) mitochondria
d) the endoplasmic reticulum
c) lysosomes?
d - Answer What describes the path traveled by a new protein as it is synthesized and
released from the cell?
a) cytosol → Golgi → ER → vesicle → plasma membrane → external environment
b) nucleus → ER → Golgi → vesicle → plasma membrane → external environment
c) nuclear envelope → ER → vesicle → Golgi → plasma membrane → external environment
d) cytosol → ER → Golgi → vesicle → plasma membrane → external environment
c) plasma membrane → ER → vesicle → Golgi → cytosol → external environment
,d - Answer Which one of the following molecules would MOST likely require a transport
protein to cross the plasma membrane of a red blood cell?
a) H20
b) CO2
c) O2
d) C6H12O6
F - Answer (T/F) Purified phospholipids gather together and form membranes only if the
appropriate enzyme is present.
b - Answer Which of the following is TRUE about the presence or absence of plasma
membranes?
a) Plant cells and bacterial cells have a plasma membrane, but animal cells do not.
b) All cells have a plasma membrane.
c) Plant cells and animal cells have a plasma membrane, but bacterial cells do not.
d) Only animal cells have a plasma membrane. Plant cells and bacterial cells have a cell wall.
c - Answer A beaker contains two solutions of glucose dissolved in water. The two solutions
have different concentrations (measured by molarity, M) and are separated by a membrane that
is permeable to water, but not to glucose. Side A has 0.3 M of glucose while side B has 0.8 M of
glucose. The water is level on both sides at this time. Which of the following statements is
TRUE?
a) There will be net movement of glucose from B to A.
b) The system will not reach equilibrium.
c) The volume will increase in side B of the beaker.
d) There will be net movement of water from B to A.
c - Answer The sodium-potassium pump is an example of:
a) a symporter.
b) passive transport.
c) an antiporter.
d) None of the answer options is correct.
,c) channel-mediated diffusion.
b - Answer Imagine that you are investigating the production of insulin in normal cells. You
are using these cells to help determine the cause of faulty insulin production in other cells, in
which insulin appears to be synthesized but fails to be secreted from the cell. You design
experiments using three different pharmaceutical compounds to help pinpoint the trouble spot
in the protein synthetic pathway. One compound blocks the movement of vesicles in the
cytoplasm. Which of the following describes what you would expect to observe?
a) an accumulation of insulin at the plasma membrane
b) an accumulation of insulin in the Golgi apparatus
c) an absence of insulin in the cell
d) an accumulation of insulin in the cytosol
b - Answer Imagine that you are investigating the production of insulin in normal cells. You
are using these cells to help determine the cause of faulty insulin production in other cells, in
which insulin appears to be synthesized but fails to be secreted from the cell. You design
experiments using three different pharmaceutical compounds to help pinpoint the trouble spot
in the protein synthetic pathway. One compound blocks SRP release from the ribosome and
mRNA. Which of the following describes what you would expect to observe?
a) an accumulation of insulin in the Golgi apparatus
b) an accumulation of insulin in the cytosol
c) an accumulation of insulin at the plasma membrane
d) an absence of insulin in the cell
c - Answer Imagine that you are investigating the production of insulin in normal cells. You
are using these cells to help determine the cause of faulty insulin production in other cells, in
which insulin appears to be synthesized but fails to be secreted from the cell. You design
experiments using three different pharmaceutical compounds to help pinpoint the trouble spot
in the protein synthetic pathway. One compound binds to and blocks the signal sequence so
that the SRP cannot recognize it. Which of the following describes what you would expect to
observe?
a) an accumulation of insulin at the plasma membrane
b) an absence of insulin in the cell
c) an accumulation of insulin in the cytosol
d) an accumulation of insulin in the Golgi apparatus
a - Answer Synthesis of a protein destined to function in the nucleus occurs:
, a) in the cytosol.
b) on the outer leaf of the nuclear envelope.
c) in the Golgi apparatus.
d) on the rough endoplasmic reticulum.
c - Answer The beaker in the illustration on Launchpad contains two solutions of salt with
different concentrations (measured by molarity, M). The two solutions are separated by a
membrane that is permeable to both salt and water. Side A contains 0.2 M of salt and side B
contains 0.9 M of salt. Which of the following will occur in this container?
a) Net diffusion of water from B to A and of salt from A to B.
b) Net diffusion of water across the membrane, but not of salt.
c) Net diffusion of water from A to B and of salt from B to A.
d) Net diffusion of salt from B to A, but no net diffusion of water.
e) Diffusion of salt across the membrane, but not of water.
c - Answer Insulin is a protein hormone that helps to control the level of glucose in the blood.
It is secreted from specialized cells in the pancreas. Based on this information, which path does
insulin take out of the cell?
a) nucleus → ER → Golgi apparatus → vesicle → exterior of cell
b) ER → nucleus → cytosol → exterior of cell
c) ER → Golgi apparatus → vesicle → exterior of cell
d) ER membrane → vesicle membrane → plasma membrane → exterior of cell
e) vesicle → ER → Golgi apparatus → exterior of cell
b - Answer Where are ribosomes found inside a cell?
a) attached to the rough endoplasmic reticulum
b) both in the cytosol and attached to the rough endoplasmic reticulum
c) in the cytosol
d) attached to the Golgi apparatus
a - Answer If a cell lacked a cytoskeleton, which of the following would likely be a result?
Complete Solutions Graded A+
c and a - Answer In lab, a dialysis tube is filled with a 15% sucrose solution, sealed, and
placed in an unlabeled beaker filled with clear liquid. The dialysis tube is made of a
semipermeable membrane that allows the free passage of water, but is not permeable to
sucrose. After 2 hours, the bag in the beaker decreases in size and becomes flaccid. This
observation suggests that at the beginning of the experiment, the solution in the bag was
__________________ compared to the solution in the beaker.
a) isotonic
b) hypertonic
c) hypotonic
Based on this observation, the contents of the beaker could have been:
a) 25% sucrose.
b) 5% sucrose.
c) 15% sucrose.
b - Answer Which of the following eukaryotic cell structures plays a role in protein trafficking
and sorting?
a) vacuoles
b) the Golgi Apparatus
c) mitochondria
d) the endoplasmic reticulum
c) lysosomes?
d - Answer What describes the path traveled by a new protein as it is synthesized and
released from the cell?
a) cytosol → Golgi → ER → vesicle → plasma membrane → external environment
b) nucleus → ER → Golgi → vesicle → plasma membrane → external environment
c) nuclear envelope → ER → vesicle → Golgi → plasma membrane → external environment
d) cytosol → ER → Golgi → vesicle → plasma membrane → external environment
c) plasma membrane → ER → vesicle → Golgi → cytosol → external environment
,d - Answer Which one of the following molecules would MOST likely require a transport
protein to cross the plasma membrane of a red blood cell?
a) H20
b) CO2
c) O2
d) C6H12O6
F - Answer (T/F) Purified phospholipids gather together and form membranes only if the
appropriate enzyme is present.
b - Answer Which of the following is TRUE about the presence or absence of plasma
membranes?
a) Plant cells and bacterial cells have a plasma membrane, but animal cells do not.
b) All cells have a plasma membrane.
c) Plant cells and animal cells have a plasma membrane, but bacterial cells do not.
d) Only animal cells have a plasma membrane. Plant cells and bacterial cells have a cell wall.
c - Answer A beaker contains two solutions of glucose dissolved in water. The two solutions
have different concentrations (measured by molarity, M) and are separated by a membrane that
is permeable to water, but not to glucose. Side A has 0.3 M of glucose while side B has 0.8 M of
glucose. The water is level on both sides at this time. Which of the following statements is
TRUE?
a) There will be net movement of glucose from B to A.
b) The system will not reach equilibrium.
c) The volume will increase in side B of the beaker.
d) There will be net movement of water from B to A.
c - Answer The sodium-potassium pump is an example of:
a) a symporter.
b) passive transport.
c) an antiporter.
d) None of the answer options is correct.
,c) channel-mediated diffusion.
b - Answer Imagine that you are investigating the production of insulin in normal cells. You
are using these cells to help determine the cause of faulty insulin production in other cells, in
which insulin appears to be synthesized but fails to be secreted from the cell. You design
experiments using three different pharmaceutical compounds to help pinpoint the trouble spot
in the protein synthetic pathway. One compound blocks the movement of vesicles in the
cytoplasm. Which of the following describes what you would expect to observe?
a) an accumulation of insulin at the plasma membrane
b) an accumulation of insulin in the Golgi apparatus
c) an absence of insulin in the cell
d) an accumulation of insulin in the cytosol
b - Answer Imagine that you are investigating the production of insulin in normal cells. You
are using these cells to help determine the cause of faulty insulin production in other cells, in
which insulin appears to be synthesized but fails to be secreted from the cell. You design
experiments using three different pharmaceutical compounds to help pinpoint the trouble spot
in the protein synthetic pathway. One compound blocks SRP release from the ribosome and
mRNA. Which of the following describes what you would expect to observe?
a) an accumulation of insulin in the Golgi apparatus
b) an accumulation of insulin in the cytosol
c) an accumulation of insulin at the plasma membrane
d) an absence of insulin in the cell
c - Answer Imagine that you are investigating the production of insulin in normal cells. You
are using these cells to help determine the cause of faulty insulin production in other cells, in
which insulin appears to be synthesized but fails to be secreted from the cell. You design
experiments using three different pharmaceutical compounds to help pinpoint the trouble spot
in the protein synthetic pathway. One compound binds to and blocks the signal sequence so
that the SRP cannot recognize it. Which of the following describes what you would expect to
observe?
a) an accumulation of insulin at the plasma membrane
b) an absence of insulin in the cell
c) an accumulation of insulin in the cytosol
d) an accumulation of insulin in the Golgi apparatus
a - Answer Synthesis of a protein destined to function in the nucleus occurs:
, a) in the cytosol.
b) on the outer leaf of the nuclear envelope.
c) in the Golgi apparatus.
d) on the rough endoplasmic reticulum.
c - Answer The beaker in the illustration on Launchpad contains two solutions of salt with
different concentrations (measured by molarity, M). The two solutions are separated by a
membrane that is permeable to both salt and water. Side A contains 0.2 M of salt and side B
contains 0.9 M of salt. Which of the following will occur in this container?
a) Net diffusion of water from B to A and of salt from A to B.
b) Net diffusion of water across the membrane, but not of salt.
c) Net diffusion of water from A to B and of salt from B to A.
d) Net diffusion of salt from B to A, but no net diffusion of water.
e) Diffusion of salt across the membrane, but not of water.
c - Answer Insulin is a protein hormone that helps to control the level of glucose in the blood.
It is secreted from specialized cells in the pancreas. Based on this information, which path does
insulin take out of the cell?
a) nucleus → ER → Golgi apparatus → vesicle → exterior of cell
b) ER → nucleus → cytosol → exterior of cell
c) ER → Golgi apparatus → vesicle → exterior of cell
d) ER membrane → vesicle membrane → plasma membrane → exterior of cell
e) vesicle → ER → Golgi apparatus → exterior of cell
b - Answer Where are ribosomes found inside a cell?
a) attached to the rough endoplasmic reticulum
b) both in the cytosol and attached to the rough endoplasmic reticulum
c) in the cytosol
d) attached to the Golgi apparatus
a - Answer If a cell lacked a cytoskeleton, which of the following would likely be a result?
