Instructions
The lab exam has 25 multiple-choice questions. You will have 40 minutes to complete it. The exam is worth 25 points. When the time expires, it will automatically shut off and your exam will be submitted immediately.
Please note: the exam will open at 12:00 a.m. (ET) on the date of the exam and it will remain accessible until 11:59 p.m. (ET). If you start the exam with less than 40 minutes before the 11:59 p.m. (ET) cutoff, the exam will stop at 11:59 p.m. (ET) regardless of where you’re at or how much time you think you have left. Thus, make sure you allot yourself enough time to complete the exam, because any questions left unanswered when the time expires will be counted wrong.
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This quiz was locked May 23 at 11:59pm.
Attempt History
| Attempt | Time | Score | |
|---|---|---|---|
| LATEST | Attempt 1 | 40 minutes | 14 out of 25 |
Correct answers are no longer available.
Score for this quiz: 14 out of 25
Submitted May 23 at 5:17pm
This attempt took 40 minutes.
IncorrectQuestion 1
0 / 1 pts
Of the following, which two were able to go through the 100 MWCO membrane?
Urea and NaCl
Glucose and Albumin
Urea and Albumin
NaCl and Glucose
UnansweredQuestion 2
0 / 1 pts
In the experiment on filtration, what happened to the filtration rate when the
membrane was changed from 20 MWCO to 200 MWCO?
membrane was changed from 20 MWCO to 200 MWCO?
it stayed the same
it increased
the filtration rate was not impacted by the MWCO
it decreased
Question 3
1 / 1 pts
Why was the resting membrane potential the same in the axon and the cell
body?
body?
because the concentration of sodium was greater in the axon than in the cell body
because the concentrations of sodium and potassium were the same in the cell body and the axon
because the concentration of calcium was greater in the cell body than in the axon
because the axon and the cell body were both unmyelinated
Question 4
1 / 1 pts
In the experiment on filtration, when you increased the driving pressure, what
happened to the rate of filtration?
happened to the rate of filtration?
it didn’t have any effect, filtration is not related to pressure
it increased
it decreased
you wouldn’t know because you don’t know what the concentration of the ions is
Question 5
1 / 1 pts
In the experiment on filtration, which substance was not able to move through
any of the membranes?
any of the membranes?
glucose
NaCl
powdered charcoal
urea
Question 6
1 / 1 pts
As the MWCO of the membranes goes from 20 to 200, what happens to
the pore size?
the pore size?
it increases in size
it decreases in size
it stays the same
the MWCO has nothing to do with the pore size
IncorrectQuestion 7
0 / 1 pts
Repolarization refers to _____________.
the membrane potential becoming less positive
the membrane potential remaining stable at -70 millivolts
the membrane potential becoming less negative
the nucleus of the neuron moving toward the cell membrane
IncorrectQuestion 8
0 / 1 pts
Which stimulus did the olfactory receptor respond to?
chemical
heat
light
pressure
Question 9
1 / 1 pts
Filtration is defined as __________.
the movement of a molecule or atom from a lower concentration to a higher concentration.
the movement of a molecule or atom from an area of higher pressure to an area of lower pressure.
the movement of a molecule or atom from a higher concentration to a lower concentration.
the movement of a molecule or atom from an area of lower pressure to an area of higher pressure.
IncorrectQuestion 10
0 / 1 pts
What happened to neurotransmitter release when calcium was removed from
the extracellular fluid surrounding a neuron?
the extracellular fluid surrounding a neuron?
it increased slightly
it stopped completely
it decreased slightly
calcium had no effect on neurotransmitter release
IncorrectQuestion 11
0 / 1 pts
When the stimulus voltage was increased from 30 mV to 50 mV, what happened
to the peak value of the action potential?
to the peak value of the action potential?
it increased proportionally, that is, it also doubled
it decreased to one-half its peak value
it increased slightly
there wasn’t any change
IncorrectQuestion 12
0 / 1 pts
Glucose requires a transport/carrier protein because __________.
it’s lipid soluble
glucose is a protein and all proteins need to carried in
it’s so small that it will not move unless it’s attached to a carrier
it’s too big to fit through the channels/pores in the membrane
Question 13
1 / 1 pts
TTX (tetrodotoxin) and lidocaine both work the same way. What do they do to
a neuron?
a neuron?
they block voltage-gated potassium channels
they block voltage-gated chloride channels
they block voltage-gated calcium channels
they block voltage-gated sodium channels
Question 14
1 / 1 pts
Which of the following best describes the term “graded potential”?
it is simply another term for repolarization
it is a change in receptor’s membrane potential based on the intensity of a stimulus
it refers to a change in the overall diameter of a neuron and an increase in the conduction velocity of a neuron
it refers to how heavily a neuron is myelinated
Question 15
1 / 1 pts
When a beaker containing a non-diffusable molecule is connected to a beaker
containing deionized water, what happens to the osmotic pressure in the beaker
containing the non-diffusible molecule as the concentration of the non-diffusible
molecule increases?
containing deionized water, what happens to the osmotic pressure in the beaker
containing the non-diffusible molecule as the concentration of the non-diffusible
molecule increases?
decreases
stays the same
increases
first it decreases and then increases rapidly
IncorrectQuestion 16
0 / 1 pts
In the experiment with facilitated diffusion, why didn’t NaCl interfere with the facilitated transport of glucose?
NaCl is too small and uses a different carrier
NaCl is positively charged and it uses negatively charged carriers
NaCl is too large to use facilitated diffusion
NaCl doesn’t require facilitated diffusion, it will move by simple diffusion
Question 17
1 / 1 pts
Why did the neuron’s membrane potential go from -70 mv to -40 mv when you
increased the extracellular concentration of potassium?
increased the extracellular concentration of potassium?
because this change caused less potassium to leave the neuron
because this change caused less calcium to enter the neuron
because this change caused a lot more sodium to enter the neuron
because this change caused a lot more potassium to leave the neuron
Question 18
1 / 1 pts
Why won’t molecules diffuse through a 200 MWCO membrane?
their movement isn’t related to their molecular weight
because they’re being carried by a low molecular weight molecule
because their molecular weight is greater than 200
because molecules are slippery
Question 19
1 / 1 pts
In the experiment with facilitated diffusion, what two things increased the rate of
the facilitated diffusion of glucose?
the facilitated diffusion of glucose?
the volume of water and the number of carriers
the amount of NaCl and the concentration of glucose
the size of the MWCO and the amount of NaCl
the number of carriers and the concentration of glucose
Question 20
1 / 1 pts
If a neuron has to go from the brain to the spinal cord (a long way), what two
things can be done to speed up the conduction velocity?
things can be done to speed up the conduction velocity?
the diameter can be decreased, and it can be demyelinated
the diameter can be decreased, and it can be heavily myelinated
the diameter can be increased, and it can be demyelinated
the diameter can be increased, and it can be heavily myelinated
Question 21
1 / 1 pts
Which of the following statements accurately describes the sodium ion
concentration inside a depolarized neuron?
concentration inside a depolarized neuron?
the sodium concentration is equal to that in the resting neuron
the sodium concentration is higher than in the resting neuron
the sodium concentration is lower than in the resting neuron
it has dropped to zero because the sodium voltage-gated channels opened
Question 22
1 / 1 pts
Which of the following is true regarding the addition of magnesium to the
extracellular fluid surrounding a neuron?
extracellular fluid surrounding a neuron?
it had the same effect as calcium
compared to the control, it prevented neurotransmitter from being released
the amount of neurotransmitter released decreased compared to the control
the action potential reached its maximum level
IncorrectQuestion 23
0 / 1 pts
Which sensory receptor responded to two different sensory stimuli?
Pacinian corpuscle
free nerve ending
olfactory receptor
visual receptor
IncorrectQuestion 24
0 / 1 pts
If the osmotic pressure using a 22% albumin solution was 90, what would the
osmotic pressure be if you used an 11% albumin solution?
osmotic pressure be if you used an 11% albumin solution?
45
180
270
90, it wouldn’t change