What is passive transport?

What is the difference between passive and active transport?

2. The cell membrade is semi permeable. What does "permeable" mean? 3. The natural spreading of particles through a liquid or gas is called _______? 4. If you were looking for transport proteins, where would you find them? 5. How do transport proteins move substances across membranes? 6. What might happen if a cell didnt have any ATP? Thanks in advance
Answer:

1. Active transport requires ATP , passive does not. 2. Permeable means that things can pass through it. Certain things can pass through the cell membrane, it's picky though (selective) 3. 4. Cell membrane 5. They usually just fuse in with the membrane. 6. Doesn't have energy to metabolize.

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