PhysioEx Lab Report
Exercise 1: Cell Transport Mechanisms and Permeability Activity 2: Simulated Facilitated Diffusion
Name: Dinara Jasmine Afra Date: 12 September 2023
Session ID: session-c0679e4b-9137-3919-6074-1a95f0a23979
Pre-lab Quiz Results
You scored 75% by answering 3 out of 4 questions correctly.
Experiment Results
Predict Questions
Molecules need a carrier protein to help them move across a membrane because
You correctly answered: they are lipid insoluble or they are too large.
1
Which of the following is true of facilitated diffusion?
You correctly answered: Movement is passive and down a concentration gradient.
2
Examples of solutes that might require facilitated diffusion include You correctly answered: all of the above.
3
Which of the following would not affect the rate of facilitated diffusion?
Your answer: steepness of the gradient.
Correct answer: the amount of intracellular ATP.
4
Predict Question 1: What effect do you think increasing the number of protein carriers will have on the glucose transport rate?
Your answer: The glucose transport rate will increase.
1
Predict Question 2: What effect do you think adding Na Cl will have on the glucose transport rate?
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Stop & Think Questions
Experiment Data
NumberRun Solute Start Conc.
L (mM) Start Conc.
R (mM) Carriers Rate (mM/sec)
1 Na Cl 0.00 0.00 500 0.0000
1 Glucose 2.00 0.00 500 0.0008
2 Na Cl 0.00 0.00 500 0.0000
2 Glucose 8.00 0.00 500 0.0023
3 Na Cl 0.00 0.00 700 0.0000
3 Glucose 2.00 0.00 700 0.0010
4 Na Cl 0.00 0.00 700 0.0000
4 Glucose 8.00 0.00 700 0.0031
5 Na Cl 0.00 0.00 100 0.0000
5 Glucose 10.00 0.00 100 0.0017
6 Na Cl 0.00 2.00 700 0.0042
6 Glucose 2.00 0.00 700 0.0010
Post-lab Quiz Results
You scored 75% by answering 3 out of 4 questions correctly.
Your answer: There will be no change in the glucose transport rate.
What happened to the glucose transport rate when the glucose concentration was increased from 2 mM to 8 mM?
You correctly answered: The glucose transport rate increased.
1
Describe the conditions that resulted in the fastest rate of glucose transport.
You correctly answered: 700 glucose carrier proteins and 8 mM glucose.
2
Why do you think equilibrium wasn't reached?
You correctly answered: The membrane proteins were saturated.
3
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What variable(s) increased the rate of facilitated diffusion of glucose?
You correctly answered: increasing the concentration of glucose and increasing 1
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Review Sheet Results
the number of membrane carriers.
For facilitated diffusion, increasing the concentration of glucose on one side of the membrane is the same as
You correctly answered: making the concentration gradient steeper.
2
When all of the membrane carriers are engaged, or busy, we say they are You correctly answered: saturated.
3
Na Cl had no effect on glucose transport because Your answer: the membrane proteins were saturated.
Correct answer: sodium is not required for glucose transport in the simulation.
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Explain one way in which facilitated diffusion is the same as simple diffusion and one way in which it is different from simple diffusion.
Your answer:
they are the same is that they both move particles and the difference is simple diffusion does not need energy.
1
The larger value obtained when more glucose carriers were present corresponds to an increase in the rate of glucose transport. Explain why the rate increased.
How well did the results compare with your prediction?
Your answer:
the glucose moved more easily and my answer is correct.
2
Explain your prediction for the effect Na Cl might have on glucose transport. In other words, explain why you picked the choice that you did. How well did the results compare with your prediction?
Your answer:
NaCl is smaller than glucose so i thought it will not affect anything.
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