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Pearson Edexcel Level 3 GCE 9BN0/03 Biology A (Salters Nuffield) Advanced PAPER 3: General and Practical Applications in Biology QP Pearson Edexcel Level 3 GCE 9BN0/03 Biology A (Salters Nuffield) A... dvanced PAPER 3: General and Practical Applications in Biology QP Plants can respond to and use light. The photograph shows a seedling starting to grow from a germinating seed. (a) Explain why the seedling needs a supply of magnesium ions. (b) Describe the role of IAA (auxin) in the phototropic response of plants. BLANK PAGE*P65462A0532* Turn over 5 2 Acetylcholinesterase is an enzyme involved in regulating the transmission of nerve impulses across some synapses. (a) Acetylcholinesterase is found on the cell surface membranes of neurones and red blood cells. These acetylcholinesterase molecules have different primary structures. In humans, a single gene codes for acetylcholinesterase. (i) Explain how a single gene can give rise to acetylcholinesterase molecules with different primary structures. (2 [Show More]
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Pearson Edexcel Level 3 GCE 9BN0/03 Biology A (Salters Nuffield) Advanced PAPER 3: General and Practical Applications in Biology QP Pearson Edexcel GCE In Biology A Salters Nuffiled (9BN0) Paper 3:...
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