2016 VJC H2 Biology Prelims Paper 2 Questions

VICTORIA JUNIOR COLLEGE BIOLOGY DEPARTMENT JC2 PRELIMINARY EXAMINATIONS 2016 Higher 2 VICTORIA JUNIOR COLLEGE VICTORIA JUNIOR COLLEGE VICTORIA JUNIOR COLLEGE VICTORIA JUNIOR COLLEGE VICTORIA JUNIOR COLLEGE VICTORIA JUNIOR COLLEGE VICTORIA JUNIOR COLLEGE VICTORIA JUNIOR COLLEGE VICTORIA JUNIOR COLLEGE VICTORIA JUNIOR COLLEGE VICTORIA JUNIOR COLLEGE VICTORIA JUNIOR COLLEGE VICTORIA JUNIOR COLLEGE VICTORIA JUNIOR COLLEGE VICTORIA JUNIOR COLLEGE VICTORIA JUNIOR COLLEGE VICTORIA JUNIOR COLLEGE VICTORIA JUNIOR COLLEGE VICTORIA JUNIOR COLLEGE VICTORIA JUNIOR COLLEGE CANDIDATE NAME CLASS 1 5 S EXAM NUMBER BIOLOGY 9648/02 Paper 2 Core Paper 14 September 2016 Additional Materials: Answer Paper 2 hours READ THESE INSTRUCTIONS FIRST Write your Class, exam number and name on all the work you hand in. Write in dark blue or blue pen. You may use a soft pencil for any diagrams or graphs. Do not use any staples, paper clips, highlighters, glue or correction fluid. Section A Answer all questions in the spaces provided on the question paper. Section B Answer any one question on the writing paper provided. The use of an approved scientific calculator is expected, where appropriate. You may lose marks if you do not show your working or if you do not use the appropriate units. At the end of the examination, 1. hand in sections A and B separately; 2. fasten all your work securely; 3. enter the question number of section B that you have answered in the grid opposite. The number of marks is given in brackets [ ] at the end of each question or part question. This paper consists of 20 printed pages. For Examiner’s Use Section A 1 2 3 4 5 6 7 8 Section B Total

1    Section A: Structured questions Answer all the questions. All answers must be written on the spaces provided and nowhere else. 1 (a) Fig. 1.1 shows the electro-micrograph of a T-helper cell found in the bloodstream of a healthy individual. Fig 1.2 shows the how a region of the T- helper cell looks like when magnified. Fig. 1.1 EM of T helper cell Fig. 1.2 Magnified region of a part of the T helper cell (i) Identify structures P and Q and describe briefly their functions. [3]

2    (ii) Contrast the structure of a lysosome with structure P. [2] (b) The cytoplasm of T-helper cells contains different proteins and enzymes, one of which is phosphofructokinase involved in the metabolism of glucose to produce energy necessary for cell survival and func tions. In order to ensure a constant supply of energy, most organisms have evol ved the use of storage molecules to store excess glucose. (i) Name a carbohydrate that functions as a storage