MCAT Question of the Day
    •

    Q:

    		 Gram staining is an important technique for identification of certain bacterial species. Gram positive and negative organisms appear differently with this stain under light microscopy. Gram positive appears purple whereas gram negative appear pink. The mechanism behind this is
    		 

    A

    		 Gram negative organisms are able to enzymatically digest purple dye

    B

    		 Gram positive organisms retain purple dye

    C

    		 Gram positive organisms are unable to uptake the pink dye

    D

    		 Gram negative organisms express protein allowing for pink dye binding



    Prokaryotes |
    Subscribe


    Is Your Score Stuck?

    We can teach you how to crush the MCAT!

    Learn More