ACJC Prelim H1 Bio P1 Ans

This paper consists of 20 printed pages. [Turn over Anglo-Chinese Junior College JC2 Biology Preliminary Examination Higher 1 BIOLOGY Paper 1 Multiple Choice Additional Materials: Multiple Choice Answer Sheet 8876/01 15 September 2023 1 hour READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. Write your name and index number in the answer sheet provided. 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 Question Paper. The use of an approved calculator is expected, where appropriate.

2 Anglo-Chinese Junior College 2023 J2 H1 8876 Paper 1 Preliminary Examination 1 How many statements about the nucleus are correct? 1 The nucleolus comprises entirely of heterochromatic DNA. 2 The nuclear pores facilitate the separate movement of rRNA and ribosomal proteins out of the nucleus. 3 The nucleoplasm can only contain pre-mRNA and not mature mRNA. 4 The nuclear envelope will only disintegrate during apoptosis. 5 There will always be only one nucleolus per nucleus. A None AOA B 1 C 2 D More than 2 2 The electron micrograph shows a particular organelle within a eukaryotic cell. Which statements about this organelle are correct? 1 The synthesis of proteins occurs on ribosomes that are attached to the membrane of this organelle. 2 This organelle is made up of multiple flattened sacs known as cisternae. 3 Post-translational chemical modification occurs in the lumen of this organelle. 4 In the liver, this organelle metabolises carbohydrates by breaking down glycogen to glucose. A 1, 2, 3 and 4 B 1, 2 and 3 only C 1 and 4 only D 4 only AOA

3 [Turn over Anglo-Chinese Junior College 2023 J2 H1 8876 Paper 1 Preliminary Examination 3 Gram staining can be used to distinguish between two groups of bacteria with different peptidoglycan cell wall structures. A blue-purple staining dye is first added to the cells, followed by the addition of alcohol to remove the staining dye. Due to the differential retention of the staining dye, the two groups of bacteria are known as Gram-positive and Gram-negative bacteria. Gram-positive bacteria tend to yield blue or purple colouration after staining as the staining dye can be retained within the cell. Gram-negative bacteria will stain pink or red as the staining dye is not retained. The diagram shows the cell wall structures for