BIO 93 Week 6: Cell Bio Exam Questions and
Answers with Verified Solutions | Latest
Updated 2026
25-1 Which of the following list the B Stimulus, receptor, transduction,
order of events commonly effector,
occurring response.
during a signaling event?
A. Stimulus, transduction,
receptor,
effector, response.
B. Stimulus, receptor,
transduction,
effector, response.
C. Stimulus, receptor, effector,
transduction, response.
D. Stimulus, response,
transduction,
effector.
,25-2 Which of the following is not E. All of the above are examples of
a commonly used
commonly used mechanism to mechanisms to regulate proteins in a
regulate activity of proteins in a signaling
signaling pathway? pathway.
A. Phosphorylation.
B. Unmasking of a nuclear
localization signal (NLS).
C. Proteolytic degradation.
D. Protein synthesis.
E. All of the above are examples
of
commonly used
mechanisms to regulate proteins
in a
signaling pathway.
25-3 Which of the following D. It is hydrophobic.
properties would be found in a
ligand that does not require a
transmembrane receptor?
A. It is hydrophilic.
B. It can bind directly to DNA.
C. It is always present at a higher
concentration outside the cell
relative to the cytoplasm.
D. It is hydrophobic.
E. It is a zwitterion.
,26-1 Which of the following signals D. Estrogen - a steroid hormone.
doesn't need a plasma
membrane receptor to enter a
cell?
A. Insulin - a hormone.
B. Adenosine - a purine
nucleoside.
C. HIV - a virus.
D. Estrogen - a steroid hormone.
E. Ferrous iron - Fe2+
26-2 Which of the following D. Ability to bind to all transmembrane
features receptors.
would be unlikely to be found in an
effective signaling molecule?
A. Ability to be synthesized rapidly.
B. Ability to be degraded rapidly.
C. Ability to be stored, released
and
recovered.
D. Ability to bind to all
transmembrane receptors.
E. Ability to be transported from
the
site of synthesis to a site of action.
, 26-3 Which best explains why B. Because different types of cells can
different types of cells might have
respond to the same extra-cellular different signaling machinery components.
signaling molecule in a different
manner?
A. Because cells can vary in the
length of their cell cycle.
B. Because different types of cells
can have different signaling
machinery components.
C. Because the core-signaling
pathway is similar in all cell types.
D. Because different cell types
bind
the same extra-cellular signaling
molecule in a different manner.
E. Because the genome sequence
can vary between cells.
ALS 15 Which of the following D. Dexamethasone
signals doesn’t need
a cell surface transmembrane
receptor or
channel to enter a cell (and why)?
A. Glucose (see figure to right)
B. Sodium ions (Na+)
C. SARS-CoV-2
D. Dexamethasone (se
E. Chloride ions (Cl-)
Answers with Verified Solutions | Latest
Updated 2026
25-1 Which of the following list the B Stimulus, receptor, transduction,
order of events commonly effector,
occurring response.
during a signaling event?
A. Stimulus, transduction,
receptor,
effector, response.
B. Stimulus, receptor,
transduction,
effector, response.
C. Stimulus, receptor, effector,
transduction, response.
D. Stimulus, response,
transduction,
effector.
,25-2 Which of the following is not E. All of the above are examples of
a commonly used
commonly used mechanism to mechanisms to regulate proteins in a
regulate activity of proteins in a signaling
signaling pathway? pathway.
A. Phosphorylation.
B. Unmasking of a nuclear
localization signal (NLS).
C. Proteolytic degradation.
D. Protein synthesis.
E. All of the above are examples
of
commonly used
mechanisms to regulate proteins
in a
signaling pathway.
25-3 Which of the following D. It is hydrophobic.
properties would be found in a
ligand that does not require a
transmembrane receptor?
A. It is hydrophilic.
B. It can bind directly to DNA.
C. It is always present at a higher
concentration outside the cell
relative to the cytoplasm.
D. It is hydrophobic.
E. It is a zwitterion.
,26-1 Which of the following signals D. Estrogen - a steroid hormone.
doesn't need a plasma
membrane receptor to enter a
cell?
A. Insulin - a hormone.
B. Adenosine - a purine
nucleoside.
C. HIV - a virus.
D. Estrogen - a steroid hormone.
E. Ferrous iron - Fe2+
26-2 Which of the following D. Ability to bind to all transmembrane
features receptors.
would be unlikely to be found in an
effective signaling molecule?
A. Ability to be synthesized rapidly.
B. Ability to be degraded rapidly.
C. Ability to be stored, released
and
recovered.
D. Ability to bind to all
transmembrane receptors.
E. Ability to be transported from
the
site of synthesis to a site of action.
, 26-3 Which best explains why B. Because different types of cells can
different types of cells might have
respond to the same extra-cellular different signaling machinery components.
signaling molecule in a different
manner?
A. Because cells can vary in the
length of their cell cycle.
B. Because different types of cells
can have different signaling
machinery components.
C. Because the core-signaling
pathway is similar in all cell types.
D. Because different cell types
bind
the same extra-cellular signaling
molecule in a different manner.
E. Because the genome sequence
can vary between cells.
ALS 15 Which of the following D. Dexamethasone
signals doesn’t need
a cell surface transmembrane
receptor or
channel to enter a cell (and why)?
A. Glucose (see figure to right)
B. Sodium ions (Na+)
C. SARS-CoV-2
D. Dexamethasone (se
E. Chloride ions (Cl-)
