MCAT Question of the Day
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    Q:

    		 Morphogens are extracellular molecules that govern tissue development and specialization during morphogenesis. Which of the following experiments would NOT constitute support for the existence of morphogens?
    		 

    A

    		 Two cells on opposite ends of the morula are switched, causing no developmental difference.

    B

    		 A single cell is removed from the morula, causing the embryo to suffer a significant morphological deformity.

    C

    		 Creating blockers for hypothesized morphogen receptors causes tissue differentiation to stop.

    D

    		 Selective activation of developmental genes increases in frequency as the distance from a particular location in the embryo decreases.



    Embryonic Development |
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