2016 VJC H2 Biology Prelims Paper 1 Questions

1      VICTORIA JUNIOR COLLEGE JC 2 PRELIMINARY EXAMINATION 2017 NAME : ____________________________________ CT CLASS : ____________________________________ H2 BIOLOGY 9744/1 Paper 1 Multiple Choice 1 hour Additional material: Multiple choice answer sheet READ THESE INSTRUCTIONS FIRST Write your name, exam number on the answer sheet provided. Do not use any staples, paper clips, highlighters, glue or correction fluid. There are 30 questions in this paper. Answer all questions. For each question there are four possible answers A, B, C and D. Choose the one you consider correct and record your choice in soft pencil on the separate answer sheet. Read the instructions on the answer sheet very carefully. Each correct answer will score one mark. A mark will not be deducted for a wrong answer. Any rough working should be done in this paper. The use of an approved scientific calculator is expected, where appropriate. This document consists of 24 printed pages, including cover page

2      1 Which of the following is a false statement regarding centrioles and ribosomes? A Both are non-membrane bound organelles. B Only centrioles are present in a cell undergoing mitosis. C Both are present in dividing and non-dividing animal cells. D Under high temperature, bot h will be denatured as they have a proteinaceous component. 2 Fig 2 shows three cell organelles W, X and Y. Which of the following statements about these organelles is true? A Only organelle Y contains RNA. B Only organelle W contains carbohydrates and phospholipids. C Organelle X has 80S ribosomes whereas organelle Y has 70S ribosomes. D Organelles X and Y have double membrane whereas organelle W has a single membrane.

3      3 Which set of factors shown below will produce the least fluid cell surface membrane? A ● High proportion of cholesterol ● High temperature B ● Low proportion of phospholipids with saturated fatty acids ● High temperature C ● Low proportion of phospholipids with unsaturated fatty acids ● Low temperature D ● High proportion of phospholipids with unsaturated fatty acid ● Low temperature 4 Fig 4 shows a repeating unit found in a biomolecule. Fig 4 In which of the following biomolecules, w ould one expect to find the above repeating unit? X Absent √ Present Cellulose Glycogen Amylose Collagen A X X √ X B √ X √ X C √ X X √ D X √ √ X

4      5 Fig 5 below is an electron micrograph of a stained fiber of deoxyhemoglobin S (HbS). Fig 5 [From G. Rykes, R.H. Crepeau, and S.J. Edelstein. Nature 272(1978):509.] Source: http://www.nslc.wustl.edu/sicklecell/part2/molecular.html Which of the following statements is true? A Mutation in the red blood cell results in the production of HbS which precipitates ou