SJI 2017 Bio Prelim P2 QP

1 Name: ________________________ Class: ___________ Index Number: _____ ST JOSEPH’S INSTITUTION PRELIMINARY EXAMINATION 2017 SECONDARY 4 (O LEVEL PROGRAMME) BIOLOGY Paper 2 Theory Candidates answer on the Question Paper 5158/02 16 August 2017 1 hour 45 minutes (1100 hr – 1245 hr) READ THESE INSTRUCTIONS FIRST Write your name, class and index number on the cover page of this Question Paper and all the work you hand in. Write in dark blue or black pen on both sides of the paper. You may use a soft pencil for any diagrams or graphs. Section A Answer all questions. Section B Answer THREE questions in this Section in the lined spaces provided. The first two questions are compulsory questions; one of which is a data-based question. The last question is in the either/or form. The number of marks is given in brackets [ ] at the end of each question or part question. For Examiner’s Use Section A / 50 Section B / 30 Total / 80 This document consists of _16_ printed pages including this cover page. [Turn over]

2 Section A: 50 marks Answer ALL questions in the spaces provided. 1 Differentiate between: a a polypeptide and a protein. ................................................................................................................. ................................................................................................................. [2] b glycogen, glucagon and glycerol. …………………………………………………………………………………. …………………………………………………………………………………. …………………………………………………………………………………. …………………………………………………………………………………. …………………………………………………………………………………. [Total: 5] [3] 2 Fig. 2.1 shows the effect of temperature on the rate of an enzyme catalysed reaction in an aquatic green plant Elodea. Fig. 2.1 a Sketch, on Fig. 2.1, the graph showing the rate of carbon dioxide absorbed by Elodea from its surrounding over the same range of temperature, when light intensity is reduced 50% from before. [1] Temperature /oC

3 b Explain the relationship of the two graphs at temperature 50oC. ................................................................................................................. ................................................................................................................. ................................................................................................................. [2] c Explain, using the ‘lock and key’ hypothesis, the increase in rate of enzyme activity between 20oC and 30oC. ................................................................................................................. ................................................................................................................. .....................................................