BIBC 102 SS2 Practice Exam Version 1.0

BIBC 102 SS2 Practice Exam Version 1.0 - Lkklkkkkkkkkkkl;...

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Lkklkkkkkkkkkkl; b. Fill in the following table about the amino acids Serine and Cysteine. Property Serine Cysteine Classification Level(s) of protein structure the side chain can potentially be involved in. Present in TPI? (Yes/No) Present in Chymotrypsin (Yes/No) c. Circle the amino acid side chain (R group) that could receive a phosphate group from a protein kinase. d. What are the three amino acids that can be phosphorylated? 2. The equilibrium constant (Keq) is much greater than 1. a. What sign is the G‟ o
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b. Is this reaction endergonic? c. Is the reverse reaction favorable? If it isn‟t under what conditions would it be favorable? d. How would a catalyst affect the equilibrium constant and the reaction? How would it accomplish this? 3. How do exergonic reactions actually power endergonic reactions in the body? Use the example of Glutamine biosynthesis in your response.
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4. Draw the mechanism for Triose Phosphate Isomerase with all proton and electron pushing arrows. Then construct a free energy diagram of the enzyme catalyzed reaction, with and without the lid loop.
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5. Chymotrypsin is a very well studied proteolytic enzyme. Answer the following questions about Chymotrypsin. a. Chymotrypsin is synthesized in an inactive form and then activated by proteolysis in the intestine. What is this an example of? b. What features of the Chymotrypsin active site account for its specificity? c. What features of the enzyme active site account for its catalytic ability? Describe the general sequence for proteolysis of a peptide. 6. Two samples of the same enzyme are tested under Michaelis Menten conditions and a pair of Lineweaver-Burke plots are constructed from the data and plotted upon the same graph. Note that the y intercepts differ by a factor of two. 7. Answer the following questions about the Glycolysis metabolic pathway.
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This note was uploaded on 09/20/2011 for the course BIBC 102 taught by Professor Price during the Summer '02 term at UCSD.

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BIBC 102 SS2 Practice Exam Version 1.0 - Lkklkkkkkkkkkkl;...

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