BIO_Ch02_SQ_e.doc - HKDSE BIOLOGY: Connecting Concepts...

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HKDSE BIOLOGY: Connecting ConceptsChapter 2Question bankShort questionsShort questions|!|BCESC0020000001|!|The diagram below shows the molecular structure of a part of a DNA molecule.(a)Identify the components X, Y and Z.(3 marks)(b)Name the basic units which make up a DNA molecule.(1 mark)(c)What are the bonds labelled A? How is this type of bond important to DNAmolecules?(2 marks)##YYXXZAguanine
________(6 marks)##Skills assessedMarks(a)Analysing data3(b)Understanding basic concepts1(c)Understanding basic concepts2© 2019Aristo Educational Press Ltd.1
HKDSE BIOLOGY: Connecting ConceptsChapter 2Question bankShort questions|!|BCESB0020000002|!|SIThe set-up below was used to find the energy content of three food samples (A, B andC). One gram of food sample was burned and the energy released heated the water in thetest tube. The starting temperatures and the highest temperatures of the water weremeasured.(a)Statetwovariables that have to be kept constant during the investigation.(2 marks)The table below shows the results.FoodsampleWater temperature (oC)Rise intemperature(oC)Energycontent(kJ per g)StartingHighestA253497.56B24401613.44C2233The energy content of the food (kJ per g) can be calculated using the formula:Energy content = volume of water (cm3) × temperature rise × 0.042© 2019Aristo Educational Press Ltd.thermometertest tube containing20 cm3of water1 g of foodsample burning2
HKDSE BIOLOGY: Connecting ConceptsChapter 2Question bankShort questions(b)Complete the table to show the rise in temperature and energy content of sample C.(2 marks)(c)The three samples are peanut oil, rice and egg white. It is known that sample A isegg white. Based on the results, deduce which sample is peanut oil.(2 marks)(d)Which element is always found in proteins but not in lipids or carbohydrates?(1 mark)##(a)volume of water in the test tube / mass of food used / distance between the burningfood and the test tube / other reasonable answer(Anytwo, 2)(b)Rise in temperature: 11oC(1)Energy content: 9.24 kJ per g(1)(c)Sample B is peanut oil.(1)The energy content of lipids is higher than / is roughly twice that of proteins.(1)(d)nitrogen(1)________(7 marks)##Skills assessedMarks(a)Practical skills2(b)Mathematical skills2(c)Analysing data2(d)Understanding basic concepts1© 2019Aristo Educational Press Ltd.3
HKDSE BIOLOGY: Connecting ConceptsChapter 2Question bankShort questions|!|BCESB0020000003|!|

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