2024 ACJC H2 Bio P2 MS

This document consists of __ printed pages. [Turn over Anglo-Chinese Junior College JC2 Biology Preliminary Examination Higher 2 CANDIDATE NAME FORM CLASS TUTORIAL CLASS I N D E X NUMBER BIOLOGY Paper 2 Structured Questions Candidates answer on the Question Paper. No Additional Materials are required. 9744/02 22 August 2024 2 hours READ THESE INSTRUCTIONS FIRST Write your Name, Class and Index number in the spaces at the top of this page. Write in dark blue or black pen. You may use an HB pencil for any diagrams or graphs. Do not use staples, paper clips, glue or correction fluid. Answer all questions in the spaces provided on the Question Paper. 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 appropriate units. The number of marks is given in brackets [ ] at the end of each question or part question. For Examiners’ use only 1 / 8 2 / 10 3 / 11 4 / 10 5 / 11 6 / 9 7 / 10 8 / 10 9 / 10 10 / 5 11 / 6 Total / 100

2 Anglo-Chinese Junior College 2024 J2 H2 9744 Paper 2 Preliminary Examination For Examiner Use Answer all questions. 1 Fig. 1.1 is an electron micrograph of a cell found in the human adrenal cortex which secretes the hormone adrenaline into the bloodstream. Fig. 1.1 (a) (i) Identify organelle P. Mitochondrion; R! mitochondria …………………………………………………………………………………………………. [1] (ii) Describe how organelle P is involved in the secretory process of the cell in Fig. 1.1. 1. ATP is synthesised during aerobic respiration/ Krebs cycle/ oxidative phosphorylation/ chemiosmosis; R! cellular respiration, glycolysis …………………………………………………………………………………………………….. 2. To provide energy R! produce energy for the synthesis and secretion of the secretory products via exocytosis; …………………………………………………………………………………………………. [2]

3 [Turn over Anglo-Chinese Junior College 2024 J2 H2 9744 Paper 2 Preliminary Examination For Examiner Use (b) Cells expressing proteins of interest are allowed to take up radioactively labeled amino acids for a brief interval, during which all newly synthesised protei ns will exhibit a certain level of radioactivity. Fig. 1.2. shows the percentage of radioactivity found in three organelles of the endomembrane system, X, Y and Z within the span of two hours. Fig. 1.2 ( i ) Identify organelle Y. Rough endoplasmic reticulum; R! rough ER / RER , ribosomes …………………………………………………………………………………………………. [1] (ii) Using Fig. 1.2, account for the level of radioactivity in organ