MCAT Question of the Day
    •

    Q:

    		 A kidney cell contains a cytosolic protein that has great binding affinity for ATP, and thus serves as a sensor for a buildup of ATP within the cell. It is noted that at the current state of the kidney cell, almost all of these sensor proteins are in the bound state. If the sodium-potassium pump is the only mechanism for the cell to equilibrate to a lower level of ATP, what chemical change can be expected within the cell?
    		 

    A

    		 Large influx of Na+ ions

    B

    		 Increase in the hypertonicity of the cell with respect to its surroundings

    C

    		 Loss of K+ ions

    D

    		 Lower ion concentration within the cell



    Membrane Transport and Signalling |
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