2024 TJC H2 Bio P1 QP

1 [Turn over TEMASEK JUNIOR COLLEGE 2024 JC2 PRELIMINARY EXAMINATION Higher 2 BIOLOGY 9744/01 Paper 1 Multiple Choice 12 September 2024 1 hour Additional Materials: Multiple Choice Answer Sheet READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. Write your name, civics group and index number on the Answer Sheet in the spaces provided. Do not open this booklet until you are told to do so. There are thirty questions on 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 booklet. The use of an approved scientific calculator is expected, where appropriate. This document consists of 20 printed pages and 0 blank page.

2 1 The flow chart show processes which take place inside animal cells. Which processes require the activity of lysosomes A W and X only B X and Y only C Y and Z only D W, X, Y and Z

3 [Turn over 2 A scientist carried out an experiment to separate the organelles in an animal cell by mass. The scientist mixed the cells with a buffer solution which had the same water potential as the cells. The cells were broken open with a blender to release the organelles. The extracted mixture was filtered and then spun in a centrifuge at a high speed to separate the heaviest type of organelle. These sank to the bottom, forming solid pellet 1. The liquid above pellet 1 was poured into a clean centrifuge tube and spun in the centri fuge at a higher speed to separate the next heaviest type of organelle. These organelles sank to the bottom, forming solid pellet 2. This procedure was repeated twice more to obtain pellet 3 and pellet 4, each containing a single organelle. What is the main function of the type of organelle extracted in pellet 2? A digestion of old organelles B production of ATP C production of mRMA D synthesis of protein 3 The three main factors that affect the rate of diffusion across a membrane can be expressed by the relationship shown. Which changes in the factors would result in the rate of diffusion doubling? 1 surface area has doubled. 2 concentration difference has halved. 3 thickness of the membrane has doubled. 4 Thickness of the membrane has halved. A 1, 2 and 4 B 1 and 3 C 1 and 4 D 2 and 3

4 4 The diagram shows the relationshi p between different polysaccha rides and glycosidic bonds formed between the monomers. Which row is correct? 1 2 3 4 5 A Amylopectin α 1,6 Cell ulo