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Name: ______________________________________________________________ Hour: ________ Diffusion Worksheet Biology A/Cells Unit 1. Use arrows to indicate the direction of diffusion in each case: is a cell membrane. A) 2. is a molecule that can pass through the cell membrane. B) For each of the situations below use an arrow to indicate the net movement of sugar into or out of the cell. (Assume that the sugar molecules can pass through the cell membrane in each case.) 1% sugar 3% sugar 1% sugar 5% sugar 1% sugar 1% sugar 3. The cell membrane is made of a ___________________ ______________________. 4. The cell membrane is _________________permeable. This means that __________________________________________ ____________________________________________________________________________________________________ 5. Diffusion always causes particles to move from a region of _______________ concentration to a region of ______________ concentration. 6. What is the difference between active transport and passive transport? 7. How are diffusion and osmosis similar? 8. How diffusion and osmosis different?