2 bcelc0050000019 si tom carried out an experiment to

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2|!|BCELC0050000019|!|SITom carried out an experiment to investigate the action of an enzyme. The followingdiagram shows the procedure and the results of the experiment.At the beginning3 minutes later30 minutes latercloudycloudyclear(a)Name the enzyme added to the egg white solution.(1 mark)(b)Explain why the solution becomes clear.(1 mark)(c) Suggestonemethod to speed up the action.(1 mark)2 cm3ofenzymesolution wasadded andstirred10 cm3ofegg whitesolutionincubationin 40owater bath© 2019Aristo Educational Press Ltd.C36
HKDSE BIOLOGY: Connecting ConceptsChapter 5Question bankStructured questions(d)Predict and explain the result if the test tube is placed in a water bath at(i)80 °C.(2 marks)(ii)2 °C.(2 marks)##(a)Protease(1)(b)Protease breaks down the proteins of egg white into amino acids.(1)(c)Increase the concentration of the enzyme / other reasonable answer(1)(d)(i)The solution will remain cloudy because(1)the enzyme will be denatured and cannot catalyse the breakdown reaction atsuch a high temperature.(1)(ii)The solution will remain cloudy because(1)the enzyme will become inactive and lead to a low reaction rate at lowtemperature.(1)________(7 marks)##Skills assessedMarks(a)Analysing data1(b)Understanding basic concepts1(c)Understanding basic concepts1(d)(i)Applying concepts2(d)(ii)Applying concepts2© 2019Aristo Educational Press Ltd.37
HKDSE BIOLOGY: Connecting ConceptsChapter 5Question bankStructured questions|!|BCELB0050000020|!|SIThe following shows an experimental set-up used to investigate the action of amylaseon starch.The following table shows the contents and the pH in each boiling tube.Boiling tubeContents inside the dialysistubingpH of the contentsAstarch + amylase2Bstarch + amylase7.5Cstarch + amylase11(a)State the action of amylase on starch.(2 marks)(b)State the tube in which the action of amylase on starch is the fastest. Explain youranswer.(2 marks)(c)Design a control for this experiment.(1 mark)Boiling tube ABoiling tube Bdialysistubingdistilledwaterwater bathat 20 ºCBoiling tube C© 2019Aristo Educational Press Ltd.38
HKDSE BIOLOGY: Connecting ConceptsChapter 5Question bankStructured questions(d)Suggest and explain a method to speed up the reaction.(2 marks)(e)Predict, if the amylase can act on starch to form the end product, whether thedistilled water surrounding the dialysis tubing contains the end product. Explainyour answer.(2 marks)##
________(9 marks)##Skills assessedMarks(a)

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Enzyme, Aristo Educational Press Ltd

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