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Animation: How Facilitated Diffusion Works
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View the animation below, then complete the quiz to test your knowledge of the concept.






1Facilitated diffusion requires
A)enzymes.
B)carrier proteins.
C)lipid carriers.
D)carbohydrate carriers.
E)lipid or carbohydrate carriers.



2Facilitated diffusion occurs
A)into the cell only.
B)out of the cell only.
C)in either direction depending on the temperature.
D)in either direction depending on the concentration gradient of the molecule.
E)in either direction depending on the size of the molecule.



3Facilitated diffusion is used to transport
A)sugars and amino acids.
B)H2O and O2.
C)CO2 and O2.
D)CO2 and H2O.
E)sugars and H2O.



4Unlike simple diffusion, facilitated diffusion requires energy expenditure by the cell.
A)True
B)False



5Facilitated diffusion requires a specific transporter for a specific molecule.
A)True
B)False







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