MAY JUNE 2026 P11 | AS Level Biology | Full Yearly PastPaper Solution | Part 2/2

In this video, we solve and explain Cambridge International AS & A Level Biology 9700 May/June 2026 Paper 11 (P11). This is Part 2/2 of the complete past paper solution, covering the questions with clear explanations to help you understand the concepts and improve your exam technique. 0:00 - INTRO 0:33 - Q21 Scientists investigated the roles of two genes, gene P and gene Q, in stimulating mitosis in tumour cells. The scientists grew cells from different types of tumour and from non-tumour cells and measured:1 the percentage of cells that transcribed gene P only 2 the percentage of cells that transcribed gene Q only 3 the percentage of cells that transcribed both gene P and gene Q. The results are shown. What can be concluded from the graph about the functions of gene P and gene Q 4:44 - Q23 The diagram shows part of a polynucleotide. What is a possible base sequence shown in the diagram? 7:36 - Q24 Which statement about the lagging strand in DNA replication is correct? 10:44 - Q25 The diagram shows a short part of three nucleic acid strands. 12:45 - Q26 The diagrams show transverse sections of parts of a plant 14:22 - Q27 The photomicrograph shows a transport tissue in the stem of a grape vine. One of the cells in this transport tissue is labelled T. 16:16 - Q28 The table lists some adaptations of plants. Which row correctly describes xerophytic adaptations? 18:45 - Q29 Which combination of changes for loading of sucrose into the phloem by companion cells is correct? 22:54 - Q30 The diagram shows an experiment that took place in 1940 to revive an animal. Air is bubbled through the reservoir to oxygenate the blood. The tubes enter and leave the neck of the animal. Which characteristics of mammalian circulation does the diagram represent? 25:58 - Q31 The graph shows the oxygen dissociation curves of haemoglobin for eight species of mammal. What can be concluded from the data shown in the graph? 28:55 - Q32 Which reactions would be affected by an inhibitor of carbonic anhydrase? 31:02 - Q33 The graph shows the pressure in three parts of the heart during one cardiac cycle. At 0.2 seconds, which part of the heart is responding to the excitatory stimulus? 31:54 - Q34 Which statement correctly describes an event in the cardiac cycle that occurs immediately after atrial systole? 34:04 - Q35 The photomicrograph shows a transverse section through a bronchus. What is the function of the tissues X and Y 36:01 - Q36 Gas exchange between air in the alveoli and blood in the capillaries is dependent on the process of diffusion. What would result in the fastest rate of diffusion? 38:02 - Q37 What increases the risk of contracting TB? 40:09 - Q38 Which statement about how the antibiotic penicillin kills bacteria is correct? 42:25 - Q39 Which type of cell is fused with a myeloma cell in monoclonal antibody production? 44:19 - Q40 A pathogen has antigens X and Y on its cell surface membrane that allow it to attach and enter human cells. Which statement is correct for a vaccine against this pathogen?