6. The Membrane
Simple and Facilitated Diffusion
Multiple Choice
Multiple ChoiceWhich of the following would be least likely to diffuse through a plasma membrane without the help of a transport protein?
A
A large, nonpolar molecule
B
Dissolved gases such as oxygen or carbon dioxide
C
A small, nonpolar molecule
D
Any of the listed molecules would easily diffuse through the membrane.
E
A large, polar molecule
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