Exam (elaborations) Biology Notes(The Fundamental Unit980

Biology higher level paper 1A specimen question paper Biology higher level paper 1A specimen markscheme Biology higher level paper 1B specimen question paper Biology higher level paper 1B specimen markscheme Biology higher level paper 2 specimen question paper Biology higher level paper 2 specimen markscheme Biology standard level paper 1A specimen question paper Biology standard level paper 1A specimen markscheme Biology standard level paper 1B specimen question paper Biology standard level paper 1B specimen markscheme Biology standard level paper 2 specimen question paper Biology standard level paper 2 specimen markscheme SPEC/4/BIOLO/HPM/ENG/TZ0/XX 0000–6001 17 pages © International Baccalaureate Organization 2023 Specimen Paper 2 hours [Paper 1A and Paper 1B] Biology Higher level Paper 1A Instructions to candidates y Do not open this examination paper until instructed to do so. y Answer all questions. y For each question, choose the answer you consider to be the best and indicate your choice on the answer sheet provided. y A calculator is required for this paper. y The maximum mark for paper 1A is [40 marks]. y The maximum mark for paper 1A and paper 1B is [75 marks]. – 2 – 0000–6001 SPEC/4/BIOLO/HPM/ENG/TZ0/XX 1. What allows the movement of water under tension in the xylem? A. Adhesion of water molecules to dissolved mineral salts B. Cohesion of water molecules due to hydrogen bonding C. Adhesion between water molecules due to uneven sharing of charges D. Cohesion between water molecules and other polar substances 2. The diagram shows the elements present in two organic molecules, W and X. Which molecules could W and X be? Nitrogen Hydrogen Carbon Oxygen Phosphorus Molecule W Molecule X Molecule W Molecule X A. monosaccharide amino acid B. nucleic acid triglyceride C. phospholipid protein D. triglyceride fatty acid – 3 – 0000–6001 SPEC/4/BIOLO/HPM/ENG/TZ0/XX Turn over 3. Which property of DNA explains how genetic information can be replicated accurately? A. Complementary base pairing B. The double helical shape C. 5’ – 3’ bonding in the sugar-phosphate backbone D. The ability of DNA to bind to histones 4. Which molecules are produced during the hydrolysis of a triglyceride molecule? A. Water and glycerol B. Fatty acids and glycerol C. Water and fatty acids D. Water and lipids 5. The structure of monomers affects the structure and function of the polymers they form. Which row describes the structural features of polysaccharides made from alpha-glucose and beta-glucose? Monomer Polymer Shape of polymer A. alpha-glucose beta-glucose starch cellulose unbranched, straight branched, helical B. alpha-glucose beta-glucose starch cellulose branched, helical unbranched, straight C. alpha-glucose beta-glucose cellulose starch branched, helical unbranched, straight D. alpha-glucose beta-glucose cellulose starch unbranched, straight branched, helical