MCAT Question of the Day
    •

    Q:

    		 In studying how a novel compound enters cells, researchers notice the compound moves against its concentration gradient across the cell membrane. Which of the following can be concluded about the mechanism of transport?
    		 

    A

    		 The transport is active unless the compound is small and nonpolar in which case it is moving via simple diffusion.

    B

    		 The transport is passive unless it is large and polar in which case it is moving via active transport.

    C

    		 The transport is passive regardless of the size and charge of the compound.

    D

    		 The transport is active regardless of the size and charge of the compound.



    Membrane Transport and Signalling |
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