Fall 09 - Name: _ C HEM 340.01: Biochemistry I - Exam 4 D...

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Name: ______________________________________________________________________________ 1 CHEM 340.01: Biochemistry I-Exam 4 December 14, 2009 Part I: Multiple Guess For 1-15, choose the single best answer unless otherwise indicated. 2 pts. each. 1) Glycogen is: a) a storage form of glucose . b) a product of glycolysis. c) the process by which glucose is converted to energy. d) an amino acid. 2) The nucleophile in the reaction catalyzed by glycogen phosphorylase is: a) water. b) the hydroxyl group of one of its serine residues. c) inorganic phosphate. d) a nitrogen on one of its histidine residues. 3) The reaction catalyzed by phosphoglucomutase is a _____ reaction. a) phosphoryl transfer b) phosphoryl shift c) redox d) transglycosylation 4) Which of the following scenarios would likely lead to glycogen synthesis? a) Eating a meal of bread and pasta and then watching TV. b) Going to the gym and working out immediately after waking up in the morning. c) Eating a meal high in protein and completely devoid of carbohydrates. d) Panicking before starting a biochemistry exam. 5) Which reaction in glycogen degradation also requires the cleavage of inorganic pyrophosphate by a separate enzyme? a) The initiation reaction. b) The transglycosylase reaction. c) The sequential removal of glucose units. d) None of the above. 6) The regulator protein that controls the hexokinase isozyme found in liver cells is found in the ____ of the cell. a) endoplasmic reticulum. b) mitochondrion c) cytosol d) nucleus
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Name: ______________________________________________________________________________ 2 7) An example of feedback inhibition in the regulation of glycolysis is: a) the interaction between phosphofructokinase I and fructose 6-phosphate. b) the interaction between phosphofructokinase I and fructose 1,6-bisphosphate c) the interaction between phosphofructokinase I and adenosine triphosphate. d) the interaction between phosphofructokinase I and citrate. 8) AMP and ADP are _______ of phosphofructokinase I. a) feedback competitive inhibitors b) feedback competitive activators c) allosteric inhibitors d) allosteric activators 9) Which of the following is not an example of a mode of regulation that we discussed for regulatory enzymes? a) Sequestration b) Covalent modification c) Substrate availability d) Product consumption 10) The citric acid cycle is also known as: a) the Krebs cycle. b) the tricarboxylic acid cycle. c) the hub of metabolic activity. d) all of the above. 11) All molecules that are to be oxidized by the citric acid cycle enter as: a) oxaloacetate. b) acetyl CoA. c) citrate. d) pyruvate. 12) The series of reactions that are catalyzed by the pyruvate dehydrogenase (PDH) complex are an example of: a) substrate channeling. b)
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This note was uploaded on 12/04/2011 for the course CHEM 340 taught by Professor T.baird during the Fall '11 term at S.F. State.

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Fall 09 - Name: _ C HEM 340.01: Biochemistry I - Exam 4 D...

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