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Independent Practice
Membrane Structure and Function
1) What determines which direction substances and molecules flow across the cell membrane? What does it mean
when movement is at equilibrium?
2) What is diffusion? Why is diffusion often referred to as passive transport? What kinds of molecules are capable of
diffusing freely across the membrane?
3) What is Osmosis? If a cell is placed into a solution of salt water, what direction will water flow (in or out of the
cell)? If a cell is placed in completely pure water, what direction will water flow? If a cell is placed in a solution
identical to that of the cytoplasm, what direction will water flow?
4) Why is it important that our cells remain a fluid that had a nearly identical solute concentration to that of the
cytoplasm?
5) How if facilitated diffusion different from regular diffusion? What structures carry out facilitated diffusion? How
do transport/channel proteins allow charged/polar molecules to pass through the membrane? How do carrier proteins
allow charged/polar molecules to cross the membrane? What is an ion gated channel?
6) What is active transport? How is it different from diffusion and passive transport? Give an example of active
transport and explain how it works.
7) How does cotransport allow the diffusion of molecules up their concentration gradient. Give a real life example of
cotransport.
8) What’s the difference between exocytosis and endocytosis? What are the three main types of endocytosis?
Independent Practice
Membrane Structure and Function
1) What determines which direction substances and molecules flow across the cell membrane? What does it mean
when movement is at equilibrium?
2) What is diffusion? Why is diffusion often referred to as passive transport? What kinds of molecules are capable of
diffusing freely across the membrane?
3) What is Osmosis? If a cell is placed into a solution of salt water, what direction will water flow (in or out of the
cell)? If a cell is placed in completely pure water, what direction will water flow? If a cell is placed in a solution
identical to that of the cytoplasm, what direction will water flow?
4) Why is it important that our cells remain a fluid that had a nearly identical solute concentration to that of the
cytoplasm?
5) How if facilitated diffusion different from regular diffusion? What structures carry out facilitated diffusion? How
do transport/channel proteins allow charged/polar molecules to pass through the membrane? How do carrier proteins
allow charged/polar molecules to cross the membrane? What is an ion gated channel?
6) What is active transport? How is it different from diffusion and passive transport? Give an example of active
transport and explain how it works.
7) How does cotransport allow the diffusion of molecules up their concentration gradient. Give a real life example of
cotransport.
8) What’s the difference between exocytosis and endocytosis? What are the three main types of endocytosis?