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- substances that are non polar or lipid soluble pass directly through the plasma membrane
- large or polar substances use membrane proteins to move through membrane
- requires no energy
- moves with the concentration gradient using simple or facilitated diffusion
Active Transport
Passive Transport
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- substances that are unable to pass through membrane using diffusion
- requires energy in the form of ATP or GTP
- transports substances against concentration gradient
- must use carrier proteins for normal molecules or vesicles for macromolecules