2024 NYJC Prelim Biology P2 (Q)

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 2 3 4 5 6 7 8 9 10 11 Total 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. [2] (ii) State two ways in which the structure of a prokaryotic cell differs from that shown in Fig. 1.1. [2]

9744 / H2 Biology / 02 3 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. [4] [Total: 8]

9744 / H2 Biology / 02 4 2 Table 2.1 contains statements about four molecules. (a) Complete the table by indicating with a tick ( ✓ ) or a cross ( ✘ ) whether the statements apply to haemoglobin, DNA, phospholipids or antibodies. You should put a tick or a cross in each box of the table. Table 2.1 statement haemoglobin DNA phospholipids antibodies contains phosphate able to replicate hydrogen bonds stabilise the molecule Contains nitrogen [4] (b) Haemoglobin is a globular protein that shows quaternary structure. It is composed of two types of polypeptide, known as α and β globin. (i) Explain how a globular protein differs from a fibrous protein, such as collagen. [2]

9744 / H2 Biology / 02 5 Fig. 2.1 shows part of the base sequence of the mRNA that codes for t he first ten amino acids of β globin. Table 2.2 shows some of the codons and the amino acids for which t