BIO_Ch05_LQ_e.doc - HKDSE BIOLOGY: Connecting Concepts...

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HKDSE BIOLOGY: Connecting ConceptsChapter 5Question bankStructured questionsStructured questions|!|BCELA0050000001|!|SIAn experiment was carried out to investigate an enzyme-catalysed reaction. Theconcentration of a substrate or product was monitored in three tubes of reactionmixtures as shown in the graph below.(a)Identify whether each of the three curves represents the changes in theconcentration of a substrate or product.(3 marks)Curve X:Curve Y:© 2019Aristo Educational Press Ltd.curve Xcurve Ycurve ZTime (minute)Concentration of substrate / product (%)1
HKDSE BIOLOGY: Connecting ConceptsChapter 5Question bankStructured questionsCurve Z:(b)The reaction mixture in one of the three tubes was wrongly prepared, leading to adifferent reaction rate.(i)Suggest with a reason which curve corresponds to the wrongly prepared tube.(2 marks)(ii)Suggesttwopossible errors during the preparation of the reaction mixture.(2 marks)(c)Curve X eventually leveled off and did not reach 100%. Suggest an explanation forthis phenomenon.(2 marks)##
________(9 marks)##© 2019Aristo Educational Press Ltd.2
HKDSE BIOLOGY: Connecting ConceptsChapter 5Question bankStructured questionsSkills assessedMarks(a)Analysing data3(b)(i)Analysing data1Applying concepts1(b)(ii)Applying concepts2(c)Applying concepts2|!|BCELB0050000002|!|STSEThe graph below shows the activity of two types of amylases. Amylase A is found inbacteria living in hot spring, while amylase B is found in barely grains.(a)Describe the effect of increasing the temperature on the activity of amylase A.Amylase activity(arbitrary units)Amylase AAmylase B(4 marks)(b)Amylase A is used in the industrial production of beer. It is mixed with germinatedbarley grains during the process.(i)What is the action of amylase on the starch in barley grains?(1 mark)© 2019Aristo Educational Press Ltd.Temperature (°C)Amylase activity(arbitrary units)Amylase AAmylase B3
HKDSE BIOLOGY: Connecting ConceptsChapter 5Question bankStructured questions

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Enzyme, Aristo Educational Press Ltd

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