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Laboratory Monitor General, Organogramistry 814 Problems and questions 1. How does a change in pH affect the structural levels of a protein? 2. After working with nitric acid (HNO3), a student noticed a yellow spot on her hand. Explain why this might have occurred. Be specific. 3. What test might be used to determine whether an unknown compound is an amino acid or a protein? Why? 4. Using your observations from the heavy metal denaturation in Part C, why is milk or egg whites often given to someone who accidentally ingests a heavy metal ion such as silver or mercury? An appetizer known as ceviche is prepared without heat by placing slices of raw fish in a solution of lemon or lime juice. After 3 or 4 hours, the fish appears to be "cooked." Explain the chemistry of this process. [Reminder: there is one more problem on the next page]