Here are two questions you should be able to answer from Chapter 2 of your Lippincott, 4th edition:

1) If a dipeptide had a glutamine residue on the N- end and a valine residue on the C- end, what would it's name be?

2) If a dipeptide had a glutamate residue on the N- end and a valine residue on the C- end, what would it's name be?

First prize: one week in Philadelphia.
Second prize: two weeks in Philadelphia.

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Brain surgeon to another: "Hey, this isn't rocket science".
Rocket scientist to another: "Hey, this isn't brain surgery".