2024 NYJC Prelim 9744 Biology P2 (A)(2)

9744 / H2 Biology / 02 NANYANG JUNIOR COLLEGE JC 2 PRELIMINARY EXAMINATION Higher 2 CANDIDATE NAME CLASS BIOLOGY 9744/02 Paper 2 Structured Questions 10 September 2024 Candidates answer on the Question Paper. No Additional Materials are required. 2 hours READ THESE INSTRUCTIONS FIRST Write your name and CT 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 no use staples, paper clips, highlighters, glue or correction fluid. DO NOT WRITE IN ANY BARCODES. 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 no use appropriate units. At the end of the examination, fasten all your work securely together. The number of marks is given in brackets [ ] at the end of each question or part question. For Examiner’s Use 1 8 2 11 3 9 4 13 5 8 6 8 7 12 8 10 9 10 10 5 11 6 Total 100 This document consists of 30 printed pages and 0 blank pages. [Turn over

9744 / H2 Biology / 02 2 Answer all the questions in this section. 1 Candida albicans is a yeast-like fungus that lives in human lungs. It is the causati ve agent of one of the opportunistic infections that may develop during AIDS. C. albicans is eukaryotic. Fig. 1.1 shows its structure. Fig. 1.1 (a)(i) Name H to L. H nucleolus ; J Golgi (body / apparatus) ; K cell wall ; R murein / peptidoglycan ignore cellulose or chitin L vacuolar membrane / vacuole ; A tonoplast R cell sap; Any two 1m; [2] (ii) State two ways in which the structure of a prokaryotic cell differs from that shown in Fig. 1.1. no double membrane-bound organelles ; no, nucleus / nuclear membrane / nuclear envelope / nucleolus ; A DNA lies free in the cytoplasm no mitochondrion ; no (large) vacuole ; no, ER / RER / SER ; no Golgi (body / apparatus) ; smaller / 70S / 18nm, ribosomes ; cell wall made of, murein / peptidoglycan / different compounds (from eukaryote) ; circular DNA / plasmid(s) / no linear DNA ; no histones / not complexed with proteins ; A naked DNA / no chromosomes AVP ; e.g. mesosomes ; pili / no 9+2 microtubule pattern

9744 / H2 Biology / 02 3 [2] C. albicans uses a transport protein, TMP1, to absorb sugar molecules from the inside of the mouth. TMP1 is encoded by a gene within the nucleus and is produced when sugars are present in the surroundings. (b) Explain how the structures within the cell shown in Fig. 1.1, are involved with the production of functioning TMP1. nucleus, transcription / described as DNA to complementary RNA code / AW ; nuclear pore, mRNA to, cytoplasm / ribosome / RER ; RER / ribosome, assembly of amino acids / translation / polypeptide or protein synthesis ; RER, transports protein to Golg