ProblemSet2-AnswerKey[1]

ProblemSet2-AnswerKey[1] - Kyle's Section klacy@ucsd.edu...

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Kyle’s Section BIBC100 – Structural Biochemistry klacy@ucsd.edu Summer 2005 Problem Set #2 1. Draw the Acid-base titration curves for solutions of Acetic Acid, H2PO4-, and NH4+ by a strong base like NaOH. Ans: Acetic Acid has the lowest pKa, then H2PO4-, then NH4+. 2. Define what a “Zwitterionic” form of an amino acid is Ans: Zwitterions have a net neutral charge. The amine group is typically protonated (+), while the carboxyl group is deprotonated (-). 3. Draw the chemical structure for an L-alpha-amino acid. Ans: NH3+ is on the left, COO- is on the top, R is on the bottom. Also, if H points upward, then the other subunits must spell CORN in a clockwise fashion. 4. Draw out the chemical structure of glutamate, and label the alpha, beta, and gamma carbons. Ans: Alpha carbon is adjacent to the carbonyl carbon 5. The pKa for the carboxyl group of glycine is about 2.3, while the pKa for the amino group of glycine is about 9.9. Draw out the different structural states of glycine as one raises the pH of solution from 2 to 12. Calculate the isoelectric point for glycine. Ans:
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ProblemSet2-AnswerKey[1] - Kyle's Section klacy@ucsd.edu...

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