[PhysioEX Chapter 1 exercise 5] PEX-01-05

Solved by ramonistry

Exercise 1: Cell Transport Mechanisms and Permeability: Activity 5: Simulating Active Transport Lab Report
Pre-lab Quiz Results
You scored 100% by answering 4 out of 4 questions correctly.

1. The movement of sodium and potassium maintained by the Na+ -K+ pump
   You correctly answered: e. requires energy and is against a concentration gradient.
2. The sodium-potassium pump is classified as a(n)
   You correctly answered: a. antiporter.
3. The sodium-potassium pump moves _____ sodium ions and _____ potassium ions simultaneously.
   You correctly answered: b. 3, 2
4. Solutes that require active transport for movement might be too large to pass or might be
   You correctly answered: a. lipid insoluble.

Experiment Results
Predict Question:
Predict Question 1: What do you think will result from these experimental conditions?
Your answer : c. No Na+ will be transported.
Predict Question 2: Do you think the addition of glucose carriers will affect the transport of sodium or potassium?
Your answer : d. No, it will not affect the transport of either ion.
Stop & Think Questions:
Why did the sodium transport stop before the transport was completed?
You correctly answered: c. The ATP was depleted.
Why was the equilibrium for the solutes reached earlier?
You correctly answered: c. There were more pumps for transport.
Experiment Data:
Run Number Solute ATP Start Conc. L Start Conc.
R
Pumps Carriers Rate
1 Na+ Cl- 1.00 9.00 0.00 500 --- 0.0188
1 K+ Cl- 1.00 0.00 6.00 500 --- 0.0125
2 Na+ Cl- 3.00 9.00 0.00 500 --- 0.0050
2 K+ Cl- 3.00 0.00 6.00 500 --- 0.0033
3 Na+ Cl- 3.00 9.00 0.00 500 --- 0.0000
4 Na+ Cl- 3.00 9.00 0.00 800 --- 0.0083
4 K+ Cl- 3.00 0.00 6.00 800 --- 0.0056
5 Na+ Cl- 3.00 9.00 6.00 800 --- 0.0083
5 K+ Cl- 3.00 0.00 6.00 800 --- 0.0056
5 Glucose --- 0.00 10.00 --- 400 0.0046#

Post-lab Quiz Results
You scored 100% by answering 4 out of 4 questions correctly.

1. What happened when you increased the amount of ATP dispensed with the same concentration of sodium and
   potassium on either side of the membrane?
   You correctly answered: b. More ions were transported.
2. At what concentration of ATP were the sodium and potassium maximally transported?
   You correctly answered: d. 3 mM ATP
3. What was the effect of adding more Na+ -K+ pumps to the simulated cell?
   You correctly answered: a. Transport of the ions was faster.
4. Describe the effect of adding glucose carriers to the sodium and potassium transport.
   You correctly answered: c. There was no change in the transport rate because glucose is transported independently.

Review Sheet Results

1. Describe the significance of using 9 mM sodium chloride inside the cell and 6 mM potassium chloride outside the cell,
   instead of other concentration ratios.
   Your answer:
   The Na+/K+ pump works with 3:2 ratio of soudium - potassium.
2. Explain why there was no sodium transport even though ATP was present. How well did the results compare with your
   prediction?
   Your answer:
   In order to observe working of Na+/K+ pump sodium and potassium need to be present. So sodium alone can not make
   pump work.
3. Explain why the addition of glucose carriers had no effect on sodium or potassium transport. How well did the results
   compare with your prediction?
   Your answer:
   Addition of Glucose and its carriers do not help or hinder Na+/K+ pumping. Because glucose transport works independently.
4. Do you think glucose is being actively transported or transported by facilitated diffusion in this experiment? Explain your
   answer.
   Your answer:
   It may transported by facilitated diffusion. Cause glucose is a lipid insoluble and too large to pass through the cell
   membrane, it requires a glucose carrier.