CHE 420 Study Guide for Exam 2
CHE 420 Study Guide for Exam 2 CHE 420
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This 3 page Study Guide was uploaded by Bethany Shay Edgeworth on Sunday October 25, 2015. The Study Guide belongs to CHE 420 at University of Southern Mississippi taught by Vijay Rangachari in Summer 2015. Since its upload, it has received 413 views. For similar materials see Principles of Biochemistry in Chemistry at University of Southern Mississippi.
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Date Created: 10/25/15
10 Study Guide for CHE 420 Exam 2 Which statements are true about enzymes a Nonbiological catalysts and enzymes tend to have a similar degree of reaction specificity b An enzyme is specific for a particular substrate A substrate must bind to the active site before catalysis can occur d An enzyme yields a specific product whereas a nonbiological catalyst may produce more than one product e Catalysis occurs at the active site What effects are produced by an enzyme on a general reaction The formation of the transition state is promoted The concentration of the reactants is increased Delta G for the reaction decreases The reaction equilibrium is shifted away from the reactants The activation energy for the reaction is lowered The rate constant for the forward reaction k1 increases Protein X had an arginine in the active site mutated to alanine and lost most of its activity Which mutations would likely restore the most activity A to K Which model is it when an enzyme active site has a rigid structure complementary of the substrate Lockandkey model Which model is it when an enzyme conformation changes when it binds the substrate so the active site fits the substrate Inducedfit model Which model is it when the substrate binds to the enzyme at the active site forming an enzymesubstrate complex Lockandkey model amp inducedfit model Which model is it when the substrate binds to the enzyme through noncovalent interactions Lockandkey model amp inducedfit model What are the 3 characteristics of allosteric enzymes 1 Interconvert between a more active form and less active form 2 May have binding sites for regulatory molecules that are separate from active sites 3 Generally have more than 1 subunit What are the 2 characteristics of reversible competitive inhibition 1 Inhibitor structure resembles substrate structure 2 Inhibitor binds noncovalently at active site What inhibition is it when the inhibitor binds noncovalently at a site other than the active site hmoncr n 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 Reversible noncompetitive inhibition What inhibition is it when the inhibitor binds covalently and permanently at a site other than the active site Irreversible inhibition Control by modulators includes what 2 mechanisms 1 Feedback inhibition 2 Allosteric regulation Control by covalent modification includes what 3 mechanisms 1 Zymogen activation 2 Regulation of chymotrypsin 3 Phosphorylation of glycogen phosphorylase Genetic control includes what 2 mechanisms 1 Enzyme induction 2 Lactose stimulation of bacterial betagalactosidase s sucrose a reducing sugar or nonreducing sugar Nonreducing sugar What consists of Nacetylglucosamine residues Chitin What is a storage form of fuel for plant cells Starch What functions in fuel storage in animal cells Glycogen What provides structural support for animals mostly in the exoskeleton of arthropods Chitin What is the storage form of glucose in animals Glycogen What provides structural support for plants Cellulose What is made up of 2 glucose polysaccharides amylose and amylopectin Starch Starch glycogen cellulose and chitin are all examples of what Homopolymers What is the general term for the proteins involved in recognition of specific oligosaccharide structures Lectins What variation in structure targets red cells and serum proteins for destruction Removal of terminal Nacetylneuraminic acid residues from glycoprotein oligosaccharides What enzyme is involved in producing glucose6phosphate from glucose Hexokinase 27 28 29 30 31 32 33 34 35 36 37 38 39 40 What enzyme is involved in producing fructose6phosophate from glucose6 phosphate Phosphohexose isomerase What enzyme is involved in producing fructose 16bisphosphate from fructose6 phosphate Phosphofructokinasel What enzyme catalyses a reversible aldol reaction fructose 16bisphosphate is broken down into glyceraldehyde 3phosphate and dihydroxyacetone phosphate Aldolase What enzyme produces glyceraldehyde 3phosphate from dihydroxyacetone phosphate Triosephosphate isomerase What enzyme forms 13bisphosphoglycerate from glyceraldehyde 3phosophate Glyceraldehyde3phsophate dehydrogenase What enzyme forms 3phosphoglycerate from 13bisphosphoglycerate Phosphoglycerate kinase What enzyme forms 2phosphoglycerate from 3phosphoglycerate Phosphoglycerate mutase What enzyme forms phosphoenolpyruvate from 2phosphoglycerate Enolase What enzyme forms pyruvate from phosphoenolpyruvate Pyruvate kinase In the first reaction of glycolysis glucose is converted into what Glucose 6phosphate The phosphate in glycolysis comes from what ATP What enzyme transfers the terminal phosphate of ATP to a substrate Kinase Fructose6phosphate is phosphorylated by a second kinase reaction producing what Fructose 16bisphosphate Select all of the true statements about PEP regulation of phosphofructokinase a PEP inhibition of phosphofructokinase yields a sigmoidal velocity versus substrate curve b The apparent affinity of phosphofructokinase for its substrate increases when PEP binds PEP competes with fructose6phosphate for the active site of phosphofructokinase All four subunits of phosphofructokinase are in the same state T or R PEP is a feedback inhibitor of phosphofructokinase PEP is a positive effector of phosphofructokinase rhme
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