MCAT Question of the Day
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    Q:

    		 The pKa of the amino acid tyrosine is between 10.0 and 10.3. Tyrosine molecule R groups are phenolics, with the hydroxyl hydrogen titrating in the pH range given. If a given solution of tyrosine molecules is brought from pH 9 to pH 11, what do you expect to occur to the hydroxyl group?
    		 

    A

    		 The hydroxyl will go from being protonated at pH 9 to being deprotonated at pH 11

    B

    		 The hydroxyl will go from being deprotonated at pH 9 to being protonated at pH 11

    C

    		 The hydroxyl will remain deprotonated during the pH shift

    D

    		 The hydroxyl will remain protonated during the pH shift



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