E2PracticeKey - Biology 310: Introductory Biochemistry...

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Biology 310: Introductory Biochemistry Practice Questions for Exam 2 Please be reminded that these are questions from an old exam from our course and that you should use them to get some idea of the kinds of questions that you will likely see on your exam. Your exam may have more or less questions, a different distribution of multiple choice versus free response, etc. As for Exam 1, you are urged NOT to look at them until you study. 1. A Scatchard Analysis of the beta-adrenergic receptor of neurons would give me which information listed below? a. The Keq for the receptor b. Whether alpha-helices or beta sheets may be present in the protein c. The average number of ephinephrine binding sites on the average cell d. Whether it was a transmembrane protein or just an integral membrane protein e. How many possible transmembrane domains are in the protein 2. Many enzymes function in multi-enzyme complexes, such as the pyruvate dehydrogenase complex, in which the product of one reaction is directly transferred to the next active site (metabolic channeling). Which of the following is NOT a reason for metabolic channeling? a. protection of intermediates from degradation b. increasing the overall rate of the reaction c. producing locally high concentrations of intermediates d. ensuring that the enzymes are properly regulated 4. Which of the following reactions is NOT highly regulated in glycolysis? a. pyruvate kinase b. phosphoglycerate kinase c. hexokinase d. phosphofructokinase 5. Which of the following statements is TRUE ? a. two molecules of ATP are consumed per glucose during the payoff phase of glycolysis b. four molecules of ATP are consumed per glucose during the preparatory phase of glycolysis c. Glucose is the only hexose which can enter the glycolytic pathway d. Isozymes are different proteins from one species, which catalyze different chemical reactions e. All of the above statements are FALSE 6. Which of the following is TRUE for insulin signaling through the insulin receptor, as a Receptor Enzyme? a. The insulin receptor is a serpentine polypeptide that has tyrosine kinase activity on its cytoplasmic (i.e. intracellular) domain. b. If the low molecular weight G-protein is mutated so that it binds GTP but cannot convert it to GDP, then the pathway is continually activated (that is, constitutive activation). c. Phosphorylation of proteins on Tyr, Ser and/or Thr regulates certain steps in signaling d. If the heterotrimeric G-protein cannot dissociate into alpha and beta-gamma subunits, then adenylate cyclase cannot get activated. 1
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e. All of the above statements are FALSE 7. Once inside the cell, glucose is rapidly phosphorylated to Glucose-6-phosphate.
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This note was uploaded on 01/06/2010 for the course MCDB 310 taught by Professor Walter during the Fall '09 term at University of Michigan.

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E2PracticeKey - Biology 310: Introductory Biochemistry...

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