Cells: The living units - Passive membrane transport

4 important questions on Cells: The living units - Passive membrane transport

What is the speed of diffusion influenced by?

- Concentration (faster with big difference)
- Molecular size (faster with small particles)
- Temperature (faster high temperature)

What determines whether a given substance can cross the plasma membrane?

- Lipid solubility
- Size

What is carrier-mediated facilitated diffusion?

Via protein carrier specific for one chemical; binding of solute causes transport protein to change shape
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What is channel-mediated facilitated diffusion?

Through a channel protein; mostly ions selected on basis of size and charge

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