WA4 Mock BT P1 (Teacher)

1 Civics Group Index Number Name (use BLOCK LETTERS) ST. ANDREW’S JUNIOR COLLEGE 2022 JC2 Weighted Assessment 4 H1 BIOLOGY 8876/01 Paper 1: Multiple Choice 50 min Additional Materials: Multiple Choice Answer Sheet READ THESE INSTRUCTIONS FIRST Do not open this booklet until you are told to do so. Write your name, civics group and index number on the multiple choice answer sheet in the spaces provided. There are 25 questions in this paper. Answer all questions. For each qu estion, 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 multiple choice Optical answer sheet. INFORMATION TO CANDIDATES Each correct answer will score one mark. A mark will not be deducted for wrong answer. Any rough working should be done in this booklet. At the end of the examination, submit both question paper and multiple choice answer sheet. This document consists of 19 printed pages [Turn over H1

2 1 The electron micrograph below shows an organelle. Which of the following statements about the labelled structures are correct? 1. X serves to compartmentalise the organelle from the extracellular environment. 2. X is made up of a phospholipid bilayer and it is selectively permeable to substances. 3. Y has embedded proteins containing chlorophyll that are involved in the absorption of light. 4. Y has embedded ATP synthase that synthesizes ATP. 5. Z contains linear double-stranded DNA. 6. Z contains glycolytic enzymes that oxidises glucose to pyruvate. A 2 and 4 B 5 and 6 C 1, 2 and 4 D 1, 3 and 6 2 Cells can be ruptured and their contents collected after a series of centrifugation at different speeds. At the end of every centrifugation set at a specific speed, a pellet containing specific organelles is formed. The supernatant is then centrifuged at a higher speed than pr eviously and the new pellet formed collected. The process is repeated as outlined in the following diagram.

3 The sequence of pellets obtained in tubes 1, 2, 3 and 4 would be A ribosomes, endoplasmic reticulum, mitochondria, nuclei. B ribosomes, mitochondria, nuclei, endoplasmic reticulum. C nuclei, mitochondria, endoplasmic reticulum, ribosomes. D nuclei, endoplasmic reticulum, ribosomes, mitochondria. 3 The diagram below illustrates the process of phloem loading with the help of proteins 1 and 2. Which of the following accurately describes the type of transport occurring at proteins 1 and 2? Protein 1 Protein 2 A Simple diffusion Active transport B Active transport Facilitated diffusion C Facilitated diffusion Facilitated diffusion

4 D Active transport Simple diffusion Explanation Transport proteins are required, hence simple diffusion should be eliminated 🡪 Only active transport and facilitated diffusion are possible. Protein 1: Transport of H+ is against concentration gradi