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Name: Ashlei Sickles Exercise 1: Cell Transport Mechanisms and Permeability: Activity 5: Simulating Active Transport Lab Report Pre-lab Quiz Results You scored 75% by answering 3 out of 4 questions correctly. 1. The movement of sodium and potassium maintained by the Na+ -K+ -K+ pump You correctly answered: e. requires energy and is against a concentration gradient. 2. The sodium-potassium sodium-potassium pump pump is classified as a(n) You correctly answered: a. antiporter. 3. The sodium-potassium pump moves _____ sodium ions and _____ potassium potassium ions simultaneously. simultaneously. You correctly answered: b. 3, 2 4. Solutes that require active transport for movement might be too large to pass or might be Your answer : b. lipid soluble. Correct answer: a. lipid insoluble.
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Experiment Results Predict Question: Predict Question 1: What do you think will result from these experimental conditions? Your answer : a. Na+ will be maximally 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
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 m M 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.
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Review Sheet Results 1. Describe the significance of using 9 mM sodium chloride inside the cell and 6 m M potassium chloride outside the cell, instead of other concentration ratios. Your answer: The significance is that the 3 Na+ ions are transported out of the cell for every 2 K+ ions. The ratio 3:2 is the same as the 9:6 mM. 2. Explain why there was no sodium transport even though ATP was present. How well did the results compare with your prediction? Your answer: There was no Na+ transport because in order for Na+K+ pump to work, both ions must be present. There was no K+ present. I was wrong. I said it would be maximally transported. 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: Na+K+ ions are actively transported via Na+K+ pump against their concentration gradient. So additional carriers have no effect on the transport. I was right. 4. Do you think glucose is being actively transported or transported by facilitated diffusion in this experiment? Explain your answer. Your answer: Glucose is being transported passively down the concentration gradient by facilitated diffusion because there was no ATP. We can assume that glucose carriers were present to assist in the transport of glucose molecules across the membrane.
