Membrane Permeability
AP Biology
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The Cell
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Membrane Transport
Q. Which of the following is an example of passive transport?
a
Aquaporins allow water molecules to diffuse freely through the membrane.
b
GLUT4 undergoes conformational changes to move glucose down its concentration gradient and into the cell. It requires no energy input.
c
The sodium-potassium pump transports potassium ions into the cell and sodium ions out of the cell. It consumes ATP in the process.
d
Calcitonin is a hormone that acts to reduce blood calcium.
e
A and B
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