IB›IB Biology SL›Mind mapsC1.1 Enzymes and metabolismIB Biology SL: Mind mapStudy pack PDFAlso for this subtopic:Revision notesFlashcardsSubtopic testCover factsWhat are they?Biological catalysts, not used upMetabolism: network of interacting reactionsAnabolism builds by condensationCatabolism breaks down: hydrolysis, oxidationActive siteEnzymes are globular proteinsWhole 3D structure shapes the active siteInduced fit: enzyme and substrate change shapeSpecific: complementary shape and chemistryRate factorsTemperature: rate rises to the optimumAbove optimum, enzyme denaturesEach enzyme has an optimum pHSubstrate concentration: rate levels off at saturationEnzymesand metabolismActivation energyEnergy needed to start a reactionEnzymes lower itReactions occur fast at body temperatureOverall energy released is unchangedMeasuring rateRate = product formed ÷ timeTimed endpoint: rate = 1/timeControl temperature, pH, concentrationsRepeat and calculate meansExam tipsEnzymes are denatured, never killedGraphs: give trend, optimum, numbers with unitsCheck the time unit in rate answersSketch graphs are models