MCAT Question of the Day
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    Q:

    		 Which of the following is TRUE of diffusion across a membrane?

    		 

    A

    		 Diffusion is characterized by unidirectional motion

    B

    		 Diffusion involves hydrophobic and small, uncharged molecules

    C

    		 Diffusion is a form of energy-requiring transport

    D

    		 Organisms only using diffusion localize their cellular functions to specific regions



    Membrane Transport and Signalling |
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