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Substances can move across the membrane via simple diffusion, facilitated diffusion, or active transport.

Where does it

occur in membrance?

Does it require

transport protein?

Does it require

input of energy?

Simple diffusion
Facilitated diffusion
Actove transport

a. What functions might each of the three types of diffusion serve in an independent cell like a Paramecium or an amoeba?

b. What functions might each of the three types of diffusion serve in a multicellular organism---for example, a human or a tree?

c. What would you need to observe or measure to determine whether a substance was moved across a membrane via each type of diffusion?

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Trinidad Tremblay
Trinidad TremblayLv2
28 Sep 2019

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