When a membrane uses energy to move a substance across it, what kind of transport is this?

• Correct Answer: active
• inactive
• fast
• slow

Explanation: x rms = 2Dt, where D is the diffusion constant, representative values of which are found in Table 12.2. • Osmosis is the transport of water through a semipermeable membrane from a region of high concentration to a region of low concentration. • Dialysis is the transport of any other molecule through a semipermeable membrane due to its concentration difference. • Both processes can be reversed by back pressure. • Active transport is a process in which a living membrane expends energy to move substances across it.

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