Exam 1 Quiz
___________ is the ability to keep the internal environment relatively stable or
a dynamic steady state
a.
Supply and demand
b.
Heterostasis
c.
Feedback system
d.
Equilibrium
✅✅-E
e.
Homeostasis -
A neuron has a resting potential of -68 mV. If the extracellular concentration of
potassium decreased from 5.5 to 3.2, what would happen to the Vm of the
neuron?
a.
it would depolarize (get more positive)
b.
none of the answers are correct
c.
it would hyperpolarize (get more negative)
d.
nothing would happen to the Vm because potassium isn't used in that
equation
✅✅-C
e.
it would change so dramatically that the neuron would die -
A neuron has a resting potential of -68 mV. If the extracellular concentration of
potassium increased from 5 to 6.5, what would happen to the Vm of the
neuron?
a.
,it would depolarize (get more positive)
b.
it would change so dramatically that the neuron would die
c.
it would hyperpolarize (get more negative)
d.
nothing would happen to the Vm because potassium isn't used in that
equation
✅✅-A
e.
none of the answers are correct -
Action potentials travel in one direction down the axon due to...
a.
specialized chloride receptors
b.
myelin
c.
the refractory period
d.
calcium concentration
✅✅-C
e.
potassium concentrations -
After an action potential is initiated, voltage-gated sodium channels open. Use
the graph from class or your textbook to answer the following: when do
voltage-gated potassium channels open up?
a.
at roughly 2 msec
b.
not until +40 mV is reached
c.
at roughly 0.25 msec
, d.
at roughly 1 msec
✅✅-E
e.
at roughly 0.5 to 0.75 msec -
ATP is...
a.
An intermediary form of fats
b.
An Atypical Transfer Protein that can result in cancer
c.
Cellular energy
d.
Not that important for cell maintenance
✅✅-C
e.
The enzyme that prevents sodium from entering cells -
Based on chapter 1 of Zoobiquity, which of the below is most accurate?
MDs are clearly superior to PhDs and DVMs
Understanding animals and shared evolutionary history is important for
human medicine
Studying animals is a waste of time and taxpayer money
Humans are very different from animals
✅✅
Human have only a set of clearly human diseases that do not impact other
animals - -Understanding animals and shared evolutionary history is
important for human medicine
Based on the HHMI video that you watched which of the below is most
accurate?
a.
The sickle cell mutation is present in regions where malaria is also present
b.
___________ is the ability to keep the internal environment relatively stable or
a dynamic steady state
a.
Supply and demand
b.
Heterostasis
c.
Feedback system
d.
Equilibrium
✅✅-E
e.
Homeostasis -
A neuron has a resting potential of -68 mV. If the extracellular concentration of
potassium decreased from 5.5 to 3.2, what would happen to the Vm of the
neuron?
a.
it would depolarize (get more positive)
b.
none of the answers are correct
c.
it would hyperpolarize (get more negative)
d.
nothing would happen to the Vm because potassium isn't used in that
equation
✅✅-C
e.
it would change so dramatically that the neuron would die -
A neuron has a resting potential of -68 mV. If the extracellular concentration of
potassium increased from 5 to 6.5, what would happen to the Vm of the
neuron?
a.
,it would depolarize (get more positive)
b.
it would change so dramatically that the neuron would die
c.
it would hyperpolarize (get more negative)
d.
nothing would happen to the Vm because potassium isn't used in that
equation
✅✅-A
e.
none of the answers are correct -
Action potentials travel in one direction down the axon due to...
a.
specialized chloride receptors
b.
myelin
c.
the refractory period
d.
calcium concentration
✅✅-C
e.
potassium concentrations -
After an action potential is initiated, voltage-gated sodium channels open. Use
the graph from class or your textbook to answer the following: when do
voltage-gated potassium channels open up?
a.
at roughly 2 msec
b.
not until +40 mV is reached
c.
at roughly 0.25 msec
, d.
at roughly 1 msec
✅✅-E
e.
at roughly 0.5 to 0.75 msec -
ATP is...
a.
An intermediary form of fats
b.
An Atypical Transfer Protein that can result in cancer
c.
Cellular energy
d.
Not that important for cell maintenance
✅✅-C
e.
The enzyme that prevents sodium from entering cells -
Based on chapter 1 of Zoobiquity, which of the below is most accurate?
MDs are clearly superior to PhDs and DVMs
Understanding animals and shared evolutionary history is important for
human medicine
Studying animals is a waste of time and taxpayer money
Humans are very different from animals
✅✅
Human have only a set of clearly human diseases that do not impact other
animals - -Understanding animals and shared evolutionary history is
important for human medicine
Based on the HHMI video that you watched which of the below is most
accurate?
a.
The sickle cell mutation is present in regions where malaria is also present
b.
