BIO 152 EXAM 1 (ACTUAL EXAM)
WITH 100% CORRECT ANSWERS
2025
You could make the positive voltage peak of the action potential
lower by: a) blocking iii.
b) blocking iv.
c) closing the deactivation gate of iii at a slower rate.
d) closing the iii at a faster rate.
e) None of the above would change the peak of the action
potential. correct answers >> d) closing the iii at a faster
rate.
To prevent the undershoot stage (D) the _________ would have to
close at a ______ rate.
a) ii : faster
b) ii : slower
c) iii : faster d) iii: slower correct answers >> a) ii : faster
Atropine is a poison that blocks nerve action by binding to ACh
receptors. Where would you expect to find atropine bound on the
figure above?
a) at letter C
b) at letter D
c) at letter E
d) at letter F
,e) at letter C, letter D, letter E, and letter F correct answers >>
c) at letter E
What if you engineered a neuron with a voltage-gated calcium
channel that stayed open longer than a typical neuron. Compared
to a typical neuron, how would this engineered neuron's action
potential differ.
a) It would have a higher resting potential.
b) It would be the same.
c) It would have a lower undershoot.
d) It would have a higher peak positive voltage. correct
answers >> b) It would be the same.
Imagine you created a toxin such that when a neuron fired an
action potential, the toxin would bind immediately to the sodium-
potassium pump at the top of the action potential, but the sodium
and potassium channels would still function. What process(es)
would be affected?
a) maintaining resting potential
b) returning to resting potential after the hyperpolarization phase
of an action potential
c) the depolarization phase of an action potential
d) the hyperpolarization phase of an action potential
e) maintaining resting potential and returning to resting potential
after the hyperpolarization phase of an action potential correct
answers >> e) maintaining resting potential and returning to
resting potential after the hyperpolarization phase of an action
potential
, Blocking the voltage-gated calcium channels in a neuron would:
a) prevent the post-synaptic neuron from firing.
b) cause the post-synaptic neuron to fire.
c) cause a reverse propagation of an action potential.
d) prevent the release of neurotransmitter into the synapse.
e) all of the above correct answers >> d) prevent the release
of neurotransmitter into the synapse.
When a new mutation in a gene occurs, what is the potential fate
of the individual having that change?
a) They may be more successful at surviving and reproducing
than those
in the population that don't have the new trait.
b) They may be less successful at surviving and reproducing than
those in the population that don't have the new trait.
c) They may be no different in their success at surviving and
reproducing than those in the population that don't have the new
trait.
d) All of the above. correct answers >> d) All of the above.
A mutation of a regulator gene decreases the production of
negatively charged macromolecules inside a nerve cell. What
effect would this have on the ability of the cell to propagate an
action potential?
a) It would make the resting potential of the cell more positive
and increase the likelihood that the neuron would fire.
b) It would have no effect on the resting potential of the cell, but
it would make the sodium channels less likely to open and
therefore decrease the likelihood that a neuron would fire.
WITH 100% CORRECT ANSWERS
2025
You could make the positive voltage peak of the action potential
lower by: a) blocking iii.
b) blocking iv.
c) closing the deactivation gate of iii at a slower rate.
d) closing the iii at a faster rate.
e) None of the above would change the peak of the action
potential. correct answers >> d) closing the iii at a faster
rate.
To prevent the undershoot stage (D) the _________ would have to
close at a ______ rate.
a) ii : faster
b) ii : slower
c) iii : faster d) iii: slower correct answers >> a) ii : faster
Atropine is a poison that blocks nerve action by binding to ACh
receptors. Where would you expect to find atropine bound on the
figure above?
a) at letter C
b) at letter D
c) at letter E
d) at letter F
,e) at letter C, letter D, letter E, and letter F correct answers >>
c) at letter E
What if you engineered a neuron with a voltage-gated calcium
channel that stayed open longer than a typical neuron. Compared
to a typical neuron, how would this engineered neuron's action
potential differ.
a) It would have a higher resting potential.
b) It would be the same.
c) It would have a lower undershoot.
d) It would have a higher peak positive voltage. correct
answers >> b) It would be the same.
Imagine you created a toxin such that when a neuron fired an
action potential, the toxin would bind immediately to the sodium-
potassium pump at the top of the action potential, but the sodium
and potassium channels would still function. What process(es)
would be affected?
a) maintaining resting potential
b) returning to resting potential after the hyperpolarization phase
of an action potential
c) the depolarization phase of an action potential
d) the hyperpolarization phase of an action potential
e) maintaining resting potential and returning to resting potential
after the hyperpolarization phase of an action potential correct
answers >> e) maintaining resting potential and returning to
resting potential after the hyperpolarization phase of an action
potential
, Blocking the voltage-gated calcium channels in a neuron would:
a) prevent the post-synaptic neuron from firing.
b) cause the post-synaptic neuron to fire.
c) cause a reverse propagation of an action potential.
d) prevent the release of neurotransmitter into the synapse.
e) all of the above correct answers >> d) prevent the release
of neurotransmitter into the synapse.
When a new mutation in a gene occurs, what is the potential fate
of the individual having that change?
a) They may be more successful at surviving and reproducing
than those
in the population that don't have the new trait.
b) They may be less successful at surviving and reproducing than
those in the population that don't have the new trait.
c) They may be no different in their success at surviving and
reproducing than those in the population that don't have the new
trait.
d) All of the above. correct answers >> d) All of the above.
A mutation of a regulator gene decreases the production of
negatively charged macromolecules inside a nerve cell. What
effect would this have on the ability of the cell to propagate an
action potential?
a) It would make the resting potential of the cell more positive
and increase the likelihood that the neuron would fire.
b) It would have no effect on the resting potential of the cell, but
it would make the sodium channels less likely to open and
therefore decrease the likelihood that a neuron would fire.
