2022 EJC Promo JC1 P2 Bio (A)

©EJC 2022 9744/ J1H2Promotional Examination /2022 [Turn over EUNOIA JUNIOR COLLEGE JC1 Promotional Examination 2022 General Certificate of Education Advanced Level Higher 2 CANDIDATE NAME ANSWER KEY CIVICS GROUP 2 2 - REGISTRATION NUMBER H2 Biology 9744 / 02 04 October 2022 2 hours Additional Materials: 12-page Answer Booklet. READ THESE INSTRUCTIONS FIRST Write your name, civics group and registration number on all the work you hand in. Write in dark blue or black pen. You may use an HB pencil for any diagrams or graphs. Do not use paper clips, highlighters, glue or correction fluid. Section A Answer all questions in the spaces provided on the Question Paper. Section B Answer all questions in the 12-page Answer Booklet. 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. At the end of the examination, submit the Question Booklet and the 12-page Answer Booklet separately. This document consists of 22 printed pages. For Examiner’s Use Section A 1 2 3 4 5 Section B 6 Total 80

2 ©EJC 2022 9744/J1H2Promotional Examination/2022 Section A Answer all questions in the spaces provided. 1 Fig. 1.1 shows the process of collagen synthesis in a fibroblast cell. Fig. 1.1 (a) With reference to Fig. 1.1, describe how procollagen is transported out of the cell. [3] 1. Secretory vesicle containing procollagen buds off from the trans face of the Golgi apparatus; 2. Moves along microtubules towards cell surface membrane; 3. Membrane of the secretory vesicle fuses with the cell surface membrane by and procollagen is released out of the cell via exocytosis; Comments Majority of students did not read the question properly and wasted time writing about how procollagen was synthesised (i.e. details of transcription and translation). The question is only concerned with how procollagen is transported out of the cell, not how procollagen is made. Also, students need to be careful in differentiating between procollagen and collagen. Question’s focus is on procollagen, not collagen. Point 1 • R: transport vesicle / Golgi vesicle • R: pinch off. “Pinch off” does not have the same meaning as “bud off”. • It is incorrect to say that a protein/procollagen buds off from the Golgi apparatus. The term “buds off” is used to describe how a vesicle is formed, not the protein. • Students need to be aware to use a capital “G” when spelling “Golgi”.

3 ©EJC 2022 9744/ J1H2Promotional Examination /2022 [Turn over Point 2 • Many students failed to earn a mark here due to the lack of mention o f the involvement of microtubules. Point 3 • A number of students failed to earn a mark