Pearson Edexcel Level 3 GCE Biology B Advanced PAPER 3 JUNE 2023 QUESTION PAPER: General and Practical Principles in Biology

Edexcel • Answer all questions. • • Try to answer every question. • The marks for each question are shown in brackets • Fill in the boxes at the top of this page with your name, Please check the examination details below before entering your candidate information Centre Number Candidate Number Pearson Edexcel Level 3 GCE Wednesday 21 June 2023 Morning (Time: 2 hours 30 minutes) Biology B Advanced Paper reference 9BI0/03 ⬟ ⬟ PAPER 3: General and Practical Principles in Biology You must have: Scientific calculator, HB pencil, ruler Total Marks Instructions • Use black ink or ball‑point pen. centre number and candidate number. • Answer the questions in the spaces provided – there may be more space than you need. Information • The total mark for this paper is 120. – use this as a guide as to how much time to spend on each question . In question(s) marked with an asterisk (*) , marks will be awarded for your ability to structure your answer logically showing how the points that you make are related or follow on from each other where appropriate. Advice • Read each question carefully before you start to answer it. • Check your answers if you have time at the end. Turn over P71911A ©2023 Pearson Education Ltd. N:1/1/1/1/ Candidate surname Other names Answer ALL questions. Write your answers in the spaces provided. 1 Glucose is a monosaccharide. (a) Complete the diagram to show the structure of beta‑glucose. CH2OH (1) H O H OH H HO H OH (b) Glucose molecules can be joined to form the polysaccharides starch and cellulose. Give three differences between the structures of starch and cellulose. 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DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA (c) Explain how the properties of starch make it suitable as an energy store in cells. 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(Total for Question 1 = 6 marks) DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA 2 Insects, such as locusts, can be dissected to show their gas exchange system. (a) (i) The diagram shows a dead locust. Draw a line on this locust to show where you would cut through the exoskeleton to expose the gas exchange system. (ii) State why you would cover the dissected locust with water. 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