2019 EJC Promo JC1 P2 Bio (Q)

©EJC 2019 9744/02/J1H2PromotionalExamination/2019 [Turn over EUNOIA JUNIOR COLLEGE JC1 Promotional Examinations 2019 General Certificate of Education Advanced Level Higher 2 CANDIDATE NAME CIVICS GROUP 1 9 - REGISTRATION NUMBER H2 Biology Paper 2 Structured Questions & Free Response Questions 9744/02 04 October 2019 2 hours Candidates are to answer all questions in section A in this question booklet. READ THESE INSTRUCTIONS FIRST Write your name, civics group and registration number on all the work you hand in. There are two sections in Paper 2, sections A and B. Answer all questions. Write in dark blue or black pen on both sides of the paper. You may use an HB pencil for any diagrams or graphs. Do not use paper clips, highlighters, glue or correction fluid. The use of an approved scientific calculator is expected, where appropriate. The number of marks is given in brackets [ ] at the end of each question or part question. This document consists of 17 printed pages and 1 blank page. For Examiner’s Use Section A 1 2 3 4 Section B 5 Total 80

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3 ©EJC 2019 9744/02/J1H2PromotionalExaminations/2019 [Turn over] For Examiner’s Use Section A Answer all the questions in this section. 1 Fig.1.1 is an electron micrograph of an animal cell. Fig 1.1 (a) (i) Identify the organelles A and B shown in Fig 1.1. [2] A: nucleus B: mitochondrion Examiner’s comments: If the arrow is pointing at one organelle, use the singular term. For example, mitochondrion instead of mitochondria (plural). (ii) Compare the structures of both organelles. [3] Similarities: 1. Both nucleus and mitochondrion are enclosed by a double membrane 2. Both contain DNA; Differences: 3. Mitochondrion has a highly folded inner membrane forming cristae, while the inner nuclear membrane is not folded; 4. Nucleus has nuclear pores in its nuclear envelope, while mitochondrion does not have pores in its double membrane; 5. AVP Examiner’s comments: For comparison questions such as this, please compare point-to-point and do not write in chunks. Note that the nucleus is also bounded by a double membrane (nuclear envelope). If size is stated as a point of comparison, give an approximate range else the point of comparison (bigger vs. smaller) looks weak. B A

4 ©EJC 2019 9744/02/J1H2PromotionalExaminations/2019 For Examiner’s Use The nucleus does not contain 80s ribosomes. Only ribosomal subunits are synthesized in the nucleolus. Assembly of 80s ribosomes occurs in the cytoplasm. Other accepted answers included: - DNA in nucleus is linear v.s. DNA in mitochondrion is circular. Protons are tran