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- 1. Multiple ChoiceHow does an enzyme's activity change with increasing concentration of substrate?decreasesstays the sameno changeincreases
- 2. Multiple ChoiceWhat makes an enzyme substrate specific?SizeShapeNameLocation it is found in
- 3. Multiple Choice
Which 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 . - 4. Multiple ChoiceWhat type of macromolecule are enzymes?ProteinCarbohydrateLipidNucleic Acid
- 5. 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
- 6. Multiple ChoiceThe part of the enzyme that the substrate bonds to is called the _____.active siteactivation energybond sitepeptide bond
- 7. Multiple ChoiceWhich of these do NOT affect enzyme activity?TemperaturepHCarbohydrates
- 8. 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.Enzymes can denature when the pH changes.Enzymes speed up chemical reactions.
- 9. Multiple ChoiceWhich of these is most likely an enzyme? (Based on the suffix)SucroseGalactoseFructoseAmylase
- 10. Multiple ChoiceWhich is NOT true?Enzymes speed up chemical reactionsEnzymes react best at a specific temperatureEnzymes only control ONE type of reactionEnzymes are made of lipids
- 11. Multiple ChoiceWhat is another name for enzymes?chemical catalystmicroorganismbiological catalystcatalyst
- 12. Multiple ChoiceWhat is the optimum temperature for most enzymes in humans0 C20 C37C80 C
- 13. Multiple ChoiceWhich of the following is a not a use of enzymes?hormone productionDNA replication (synthesis)Protein synthesisdigestion of food
- 14. Multiple ChoiceWhat is the name for the mechanism of enzyme activity?Lock and keyjigsaw puzzlehammer and nailtwo hands pattern
- 15. Multiple ChoiceHow do enzymes work?Slow down chemical reactionsPrevent chemical reactions from workingincrease the activation energyspeed up the chemical reaction
- 16. Multiple ChoiceWhat are the enzymes called when they are at low temperature?denaturedKilledinactivenormal
- 17. Multiple ChoiceAs the temperature increases, enzyme's rate of reaction increases why?increased no. of enzymessubstrates are activehigher kinetic energy so higher collisionsenzymes are occupied
- 18. Multiple ChoiceIn the experiment conducted to check the effect of substrate concentration on rate of reaction. What is the independant variable?TimeReaction Rateconcentration of substrateconcentration of enzyme
- 19. Multiple ChoiceWhat is the substrate for the enzyme catalase?HydrogenWaterOxygenHydrogen Peroxide
- 20. Multiple ChoiceWhat is broken down by the enzyme Amylase?SugarStarchOilsMeat
- 21. Multiple ChoiceWhat is the optimum pH of pepsin (found in the stomach gastric juice of humans)5279
- 22. Multiple ChoiceWhy does the reaction rate reaches plateau in the experiment conducted to test the affects of increasing concentration of enzyme?timelimited by substrate amountenzymes are denaturedenzymes are inactive
- 23. Multiple ChoiceWhat is the dependant variable in testing the effect of temperature on enzyme activity?enzymerate of reactiontemperaturetime
- 24. Multiple ChoiceIf you are testing for the effect of enzyme concentration on rate of reaction, what IS NOT a constant variable?type of enzymeenzyme concentrationconcentration of substrateType of substrate
- 25. Multiple ChoiceYou do an experiment to test for catalase using the potato strip and hydrogen peroxide. You noticed that if you repeat the experiment again with the same potato, bubbles can be seen again! Why?enzymes are used upenzymes are occupiedenzymes can be reusedenzymes are denatured
- 26. Multiple Choicewhich one of the following is NOT the property of enzymes?enzyme actions are specificenzymes can be reusedenzymes are affected by pHOptimum temperature of all enzymes is 37
- 27. Multiple Choicethe pH at which an enzyme is most efficient is called the _________ pH of an enzymeneutraloptimumminimumexperimental
- 28. Multiple ChoiceWhat is structure A?SubstrateActive siteEnzymeProducts
- 29. Multiple ChoiceEnzymes are considered to beLipidsCarbohydrateProteinNucleic Acid
- 30. Multiple ChoiceWhat is the purpose of an enzyme?give permission for the reactionraise activation energyspeed up reactionscontrol how many reactions occur
- 31. Multiple ChoiceWhere do substrates bind on an enzyme?voltage-gated channelssurface receptorcalcium channelsactive site
- 32. Multiple ChoiceEnzymes are capable of increasing the rate of a chemical reaction within a living cell. Enzymes accomplish this through which of the following means?reducing the number of productsreducing the activation energyincreasing the temperature of the cellincreasing the concentration of reactants
- 33. Multiple ChoiceWhat is structure D?SubstrateActive siteEnzymeProducts
- 34. Multiple ChoiceWhat is structure C?SubstrateActive siteEnzymeProducts
- 35. Multiple ChoiceWhat is structure E, F, G?SubstrateActive siteEnzymeProducts
- 36. Multiple ChoiceHow do enzymes speed up chemical reaction?Increasing activation energyDecreasing activation energyIncreasing deactivation energyDecreasing deactivation energy
- 37. Multiple ChoiceWhat is a substance called if it speeds up a chemical reaction?reusablecatalystspecificfragile
- 38. Multiple ChoiceEach enzyme only has 1 substrate that will fit its active site. What is this called?reusablecatalystspecificfragile
- 39. Multiple ChoiceThe graph shows how enzymes affect reactions in cells. Which statement best summarizes the information shown in the graph?Enzymes increase the energy of the reactants.Enzymes decrease the energy level of the products.Enzyme decrease the activation energy of the reaction.Enzymes reverse the direction of the reaction.
- 40. Multiple ChoiceWhat 3 letters do enzymes typically end in?-ose-ase-ese-tic
- 41. Multiple ChoiceAny substance that is acted upon by an enzyme is called a(n)?CoenzymeSubstrateVitaminPolypeptide
- 42. Multiple ChoiceAfter the enzyme and substrate bind together and perform the reaction, what does the substrate become?a substratean enzymea productan active site
- 43. Multiple ChoiceBased on the graph, what is the optimal temperature for this enzyme?15oC40oC30oC35oC
- 44. Multiple ChoiceAn enzyme speeds up a chemical reaction in the cell but can only be used once. True or False?truefalse
- 45. Multiple ChoiceWhat is the optimal pH of enzyme A?825.7-1010
- 46. Multiple ChoiceWhat is the pH range of enzyme A?20-3.73.70
- 47. Multiple ChoiceAt high temperatures enzyme activity declines because of:DenaturationDecreased Kinetic MotionIncreased H-BondingDissociation of Ionic Compounds
- 48. Multiple ChoiceAt low temperatures enzyme activity declines because of:DenaturationDecreased Kinetic MotionIncreased H-BondingDissociation of Ionic Compounds
- 49. Multiple ChoiceWhich substrate would this enzyme catalyze?Δσ∅μ
- 50. Multiple ChoiceA copper penny turning greenish after a few years is an example of ...Chemical ChangePhysical Change
- 51. Multiple ChoiceA change in which NEW substances are formed.Chemical changePhysical changeCasual changeFormal change
- 52. Multiple ChoiceWhich of the following is NOT an example of chemical change?sour milkburning woodbreaking a pencilrust
- 53. Multiple ChoiceWhich of the following IS a physical change?Getting a haircutRusty metalsour milkA compound
- 54. Multiple ChoiceIs melting butter for popcorn a chemical or physical change?chemicalphysical
- 55. Multiple ChoiceRipping up paper ...Chemical ChangePhysical Change
- 56. Multiple ChoiceA change in phase ...Chemical ChangePhysical Change
- 57. Multiple ChoiceBubbles form when two or more substances are combined ...Chemical ChangePhysical Change
- 58. Multiple ChoiceCauses a change in odor ...Chemical ReactionPhysical Reaction
- 59. Multiple ChoiceEvidence of Chemical Change.New SubstanceSize changeState changeMixture
- 60. Multiple ChoiceWhat is an engery- yielding nutrient composed of carbon, hydrogen, oxygen, and nitrogen?carbohydratelipid (fat)proteinnone of the above
- 61. Multiple ChoiceThe body has ______ types of protein. Each type performs a specific job.3003,00030,0003 million
- 62. Multiple ChoiceWhat does it mean to denature proteins?change them in a way that can not be un-donekeep them in the same form they are eaten incombine them to make complete proteinsnone of the above
- 63. Multiple ChoiceWhich of the follow are NOT functions of proteins?build and maintain tissues and maintain acid-base balancemake important compounds and regulate mineral and fluid balancecarry vital substances and provide energyall of the above ARE functions of protein
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