Practice_Final_Questions_KEY - BIBC 100: Practice Final...

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BIBC 100: Practice Final Questions: KEY I. TRUE/ FALSE 1. Enzymes can catalyze reactions in both the forward and reverse directions by lowering free energy. FALSE 2. Cyclic AMP (cAMP) binds to the regulatory subunits of protein kinase C (PKC), causing the regulatory subunits to dissociate from the catalytic subunits and exposing the active sites. FALSE 3. Lipids are considered amphipathic because they consist of both hydrophilic and hydrophobic amino acids. FALSE 4. When using fluorescence recovery after photobleaching (FRAP) to measure lipid diffusion rate, the shorter it takes to recover the red spot, the faster the lipids are diffusing. TRUE 5. In passive transport, uncharged solutes go down their chemical gradients, and charged solutes go down their electrochemical gradients. TRUE 6. PKA converts GSK3(Active) to GSK3- P (Inactive). FALSE 7. Grb2 binds phosphorylated tyrosines on IRS-1 via a SH3 domain. FALSE II. MATCHING- Mark the letter of the description that best describes the term on the left. E 1. Phosphodiesterase A. No appropriate term G 2. Multi- drug resistant protein B. Ligand for ER Ca++ channels C 3. Calmodulin C. Ubiquitous calcium binding protein J 4. Homeodomain D. Motif found in long alpha helices A 5. Zymogen E. Breaks down cAMP to 5’ AMP I 6. Ouabain F. Released from the membrane by extreme pH B 7. IP3 G. contains ATP binding cassette H. Inhibits adenylyl cyclase I. Inhibits Na+/K+ ATPase J. DNA binding protein motif III. Amino Acid Review Give the one letter codes for the amino acid(s) described in each statement; if the statement doesn’t apply to any of the amino acids, write “none” D,E 1. 2 Amino acids with a net negative charge at pH 7 C 2. Acted on by Beta- mercaptoethanol None 3. Does NOT exist in water as a zwitter ion G,P 4. 2 residues commonly found in collagen None 5. Binds to oxygen in the heme group H 6. binds to iron in the heme group S,T,Y 7. 2 residues that are commonly phosphorylated L 8. Found in the channel of the nicotinic acetylcholine receptor when the channel is closed
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Y 9. Binds to the SH2 domain when phosphorylated R, K 10. 2 possible amino acids in the third position of the consensus sequence of PKA
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This note was uploaded on 04/11/2008 for the course BIBC 100 taught by Professor Nehring during the Winter '07 term at UCSD.

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Practice_Final_Questions_KEY - BIBC 100: Practice Final...

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