Bio 152 exam 1 -actual exam questions with
correct answers
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. - verified 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 - verified 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 - verified 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. - verified 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 - verified 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 - verified 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.
correct answers
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. - verified 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 - verified 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 - verified 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. - verified 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 - verified 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 - verified 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.
