Ex 8.0

Active Transport
Activity 6:  Active Transport

1.At the end of this experimental run, did the Na+/Cl- move from the left vessel to the right vessel? No
2.Why?
Sodium transport does not occur because what ion is not available? The Na+/K+ pump requires both a sodium and ___________ presence on opposite sides of the membrane.
3.As the run progresses, the concentrations of the solutes will change in the windows next to the two beakers.  The rate will slow down markedly, then stop before completed.  Why? Lack of ATP
4.Does the amount of NaCl/KCl transported change?
Yes, more solute is transported. -2pts
5.Does the amount of solute transported across the membrane change with an increase in carriers or pumps? The rate of active transport will decrease if fewer pumps
6.Is one solute more affected than the other? No
7.Does the membrane you “built” allow simple diffusion? Yes
Try this, add different amounts of glucose to both beakers and observe what happens.
8.If y placed 9 mM NaCl on one side of the membrane and 15 mM on the other side, would there be movement of the NaCl?  Why? No,
Because like in #2 above there is no potassium present. The Na+/K+ pump requires both a sodium and potassium presence on opposite sides of the membrane.

9.Does the amount of ATP added make any difference?  yes