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missylooloo missylooloo
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12 years ago
5-1: Watch the solute concentration windows at the side of each beaker for any changes in Na+ and K+ concentrations. The Na+ transport rate stops before transport has completed. Why do you think that this happens? Hint: think about what is necessary for active transport to occur.

5-2: What would happen if you did not dispense any ATP?

5-3: Has the amount of Na+ transported changed?

5-4: What would happen if you decreased the number of sodium-potassium pumps?

5-5: Explain how you could show that this phenomenon is not just simple diffusion. (Hint: Adjust the Na+ concentration in the right beaker).

5-6: Is Na+ transport affected by this change? Explain your answer.

5-7: What would happen to the rate of ion transport if we increased the number of sodium-potassium pump proteins? 

5-8: Would Na+ and K+ transport change if we added glucose solution?
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Valued Member
12 years ago
Here's what it should say:

7. Solute transport stops before the completion of transport because of a lack of ATP. Sodium and potassium transport will not occur if ATP is not available.

8. Yes, transport has changed because more ATP is available. This fact supports the earlier supposition that ATP is required for active transport. The rate of active transport will decrease if fewer solute pumps are available, but will still go to completion given enough ATP and time. You can show that this is an active process by making the sodium concentration in the right beaker greater than the sodium concentration in the left beaker. Transport will occur against the concentration gradient in active transport but not in diffusion.

9. Sodium transport is not affected by putting NaCl into the right beaker. Increasing the number of pump proteins will increase solute transport. Glucose presence does not affect active transport.
missylooloo Author
wrote...
12 years ago
which questions are those for? its says 7,8,9 because there is no question 9
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