6. The Membrane
Active Transport
Multiple Choice
Multiple ChoiceActive transport requires an input of energy and can also generate voltages across membranes. Based on this information, which of the following statements is true?
A
Active transport can use ATP as its energy source and ensures that there is no voltage across the cell membrane.
B
Active transport moves solutes down their concentration gradients and always uses ATP as the source of energy to do this.
C
Active transport uses channel proteins and ensures that the interior of the cell is always positive compared to the exterior of the cell.
D
The source of energy for active transport of a solute up its gradient can be ATP or a concentration gradient of a second solute. This second gradient of solutes maintains no net difference in voltage across the membrane.
E
The sodium-potassium pump hydrolyzes ATP and results in a net positive change outside the cell membrane.
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