Winter 2008 Practice Exam

Winter 2008 Practice Exam - 1 Which of the following would...

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1. Which of the following would NOT be found on the extracellular face of the plasma membrane as a normal component? A. Sphingolipids like sphingomyelins B. Cholesterol C. Farnesyl-linked proteins D. Glycerophospholipids like phosphatidylserine E. Glycosylphosphtidylinositol-linked proteins 2. Which statement is FALSE? A. The cytoplasmic leaflet of Golgi membranes is composed of different lipids than the inner leaflet of the Golgi membrane. B. Liposomes most resemble biological membranes, compared to micelles. C. Facilitated diffusion of Na+ can still occur when Vm=0 for a cell. D. All transmembrane proteins are also integral proteins. E. The sodium-potassium ATPase is an example of Secondary Active Transport 3. What specific mechanism is used in Step 2 of glycolysis, the conversion of glucose 6-phosphate to fructose 6-phosphate. A. Oxidation B. Racemization C. Isomerization D. Phosphorylation E. Decarboxylation 4. What important reaction occurred to yield α-ketoglutarate from isocitrate? A. Substrate level phosphorylation and hydration B. Decarboxylation and hydration C. Decarboxylation and oxidation of NADH D. Decarboxylation and reduction of NAD+ 5. Glycogen is converted to monosaccharide units by: A. Glucokinase B. Glucose-6-phosphatase C. Glycogen phosphorylase D. Glycogen synthase E. Glycogenase 6. A double-reciprocal plot of data for K+ transport by the Potassium Channel of bacteria would yield which of the following from the Y-axis intercept? A. The maximal rate of potassium transport B. The Kt value for potassium transport C. The Affinity of the channel for potassium D. The Km of the channel for potassium E. Whether an inhibitor of the channel is competitive or uncompetitive
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7. The F-Type Na+/K+ ATPase is characterized as which of the following? A. Symport B. Antiport C. Uniport D. Facilitated Transport E. Spaceport 8. The term “depolarization” can best be applied to which of the following? A. Serpentine receptors B. Gated Ion Channels C. Receptor Enzymes D. Aquaporins E. Microdomains 9. Which of the following would be found in large numbers within modules of proteins in a Receptor Enzyme signaling pathway? A. Rafts B. SH2 domains C. cAMP D. Microdomains E. Cholesterol 10. I did a Hydropathy Plot and a Scatchard Analysis for the neuronal acetylcholine receptor. What did I learn about the receptor from these tests? A. There are 6,200 ligand binding sites per cell and each alpha subunit might cross the plasma membrane three times. B. Each receptor molecule has two ligand binding sites and possibly three transmembrane domains C. The affinity for acetylcholine is greater than the affinity of the insulin receptor for insulin, but each receptor has more transmembrane domains than the insulin receptor. D. Each receptor subunit has three alpha-helical segments and the ligand binds with high
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Winter 2008 Practice Exam - 1 Which of the following would...

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