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Question: a tetrapeptide with the sequence kids has been isolated from...

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A tetrapeptide with the sequence, KIDS, has been isolated from a protein hydrolysate mixture.  A solution of the tetrapeptide (500. ml of 0.80 M) is mistakenly left out of the freezer for several days, and the investigator suspects that trace amounts of proteolytic enzymes may be present.  

A.  Explain (using a minimum of words) how the investigator can determine by titration whether the solution contains the intact tetrapeptide or an equimolar mixture of the individual amino acids K, I, D, S (assume these are the only two possibilities).  

B.  Schematically show the titration curves expected in each case.  Be sure to label the axes.

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