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- 1. Multiple ChoiceWhat type of macromolecule are enzymes?ProteinCarbohydrateLipidNucleic Acid
- 2. Multiple ChoiceEnzymes need certain environmental conditions in order to function properly. What happens when enzymes are heated to a high temperature?they diethey denaturethey change their amino acid sequencethey work better
- 3. Multiple ChoiceWhich of the following correctly describes how enzymes work?they lower the energy of the reactants to increase the rxn ratethey supply energy to the reaction to increase the rxn ratethey lower the energy of the products to increase the rxn ratethey lower the activation energy of the reaction to increase the rxn rate
- 4. Multiple ChoiceWhich enzyme breaks down hydrogen peroxide to water and oxygen gas?sucraselactasecatalaseperoxidase
- 5. Multiple ChoiceEnzymes are made up of these repeating monomers.monosaccharidesamino acidsnucleotidesphospholipids
- 6. Multiple ChoiceThe part of the enzyme that the substrate bonds to is called the _____.active siteactivation energybond sitepeptide bond
- 7. Multiple ChoiceWhich of the following is not a job of a proteinAct as hormones and enzymesDo much of the work in cells and transport materialsBuild tissues and musclesstore and transmit genetic information
- 8. Multiple ChoiceWhat is a substance called if it speeds up a chemical reaction?reusablecatalystspecificfragile
- 9. Multiple ChoiceWhat 3 letters do enzymes typically end in?-ose-ase-ese-tic
- 10. Multiple ChoiceChanges in pH and temperature can damage an enzymes active site. What is this called?reusablecatalystspecificdenature
- 11. Multiple ChoiceThe energy needed to start a reactionactivation energyadhesion energychemical energycohesion energy
- 12. Multiple Choice
What is structure A?SubstrateActive siteEnzymeProducts - 13. Multiple ChoiceWhat is structure D?SubstrateActive siteEnzymeProducts
- 14. Multiple ChoiceWhat is structure C?SubstrateActive siteEnzymeProducts
- 15. Multiple ChoiceWhat is structure E, F, G?SubstrateActive siteEnzymeProducts
- 16. Multiple ChoiceOnce a new product leaves an enzyme, the enzyme is unchanged and ready for the next substrate. What is this called?reusablecatalystspecificfragile
- 17. Multiple ChoiceWhich of the following conclusions can be drawn from this graph?The optimum pH of the enzyme is 6.6.The optimum pH of the enzyme is 5.8The enzyme’s activity increases as pH increases 5.0 to 9.0The enzyme’s activity is greater around pH of 8.0 .
- 18. Multiple ChoiceBased on the graph, what is the optimal temperature for this enzyme?15oC40oC30oC35oC
- 19. Multiple ChoiceWhich of these is NOT true?Enzymes can denature (change shape) when the temperature gets too high.Enzymes can only be used once in a chemical reaction.Extreme pH can denature enzymes.Enzymes speed up chemical reactions.
- 20. Multiple ChoiceWhich of these is most likely an enzyme?SucroseGalactoseFructoseAmylase
- 21. Multiple Choice
Which of the following correctly describes enzyme structure and function?
The shape of an enzyme is responsible for its function.
All enzymes can bind to all substrates.
The substrate is responsible for the shape of the enzyme.
The location of an enzyme determines its function.
- 22. Multiple Choice
If a mutation occurs in a DNA sequence that codes for an enzyme, what is the most likely result?
There will likely be no change in the shape and function of the enzyme.
The enzyme will most likely fold in a way that makes its shape incompatible with the substrate and the enzyme will not function correctly.
The enzyme will not be produced at all.
The enzyme will have an enhanced ability to bind with the substrate.
- 23. Multiple Choice
Which of the following is directly responsible for the shape of an enzyme/protein?
The amino acid sequence of the protein and the properties of the amino acids that make up the protein.
The temperature of the surrounding environment.
The pH of the surrounding environment.
The amount of substrate present.
- 24. Multiple ChoiceThe active site of an enzyme is whereSubstrates bindProducts enterAllosteric regulators bind
- 25. Multiple ChoiceVitamin CCofactorCoenzymeCompetitive inhibitor
- 26. Multiple ChoiceZinc and IronCoenzymesCofactorsOrganic
- 27. Multiple ChoiceBlocking Active site of an enzymecompetitive inhibitionallosteric inhibition
- 28. Multiple ChoiceThe induced fit model of enzyme activity suggests which of the following?the binding of substrate depends on the conformation of the active sitethe binding of an activator alters the active site to enable binding of products more tightlybinding of substrate changes the conformation of the active site to bind substrate more tightlybinging of competitive inhibitors changes the shape of the active site to bind substrate less tightly
- 29. Multiple ChoiceWhich of the following represents the activation energy needed for the noncatalyzed reverse reaction, C + D → A + B, in Figure 8.1?ACDE
- 30. Multiple ChoiceAssume that the reaction has a ΔG of –5.6 kcal/mol. Which of the following would be true?The reaction could be coupled to power an exergonic reaction with a ΔG of +8.8 kcal/mol.The reaction could be coupled to power an endergonic reaction with a ΔG of +6.2 kcal/mol.The reaction would result in a decrease in entropy ( S) and an increase in the total energy content (H) of the system.The reaction would result in an increase in entropy ( S) and a decrease in the total energy content (H) of the system.
- 31. Multiple ChoiceWhat was the substrate in our enzyme lab?Hydrogen peroxideCatalaseYeastOxygen gas
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