Edexcel A level biology

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Edexcel A Level Biology Paper 3 Mark scheme June 2022: (9BI0) Paper 3: General and Practical Principles in Biology
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Edexcel A Level Biology Paper 3 Mark scheme June 2022: (9BI0) Paper 3: General and Practical Principles in Biology. A description including four of the following • {sodium / Na} channels open (1) • sodium ions flow into {axon / cell / neurone} (1) • this causes depolarisation (1) • {sodium / Na} channels close at {0.8ms / 30mV} (1) • {potassium / K} channels open at {0.8ms / 30mV} (1) (4) Question Number Answer Additional Guidance Mark 1(b) An answer that includes the followin...
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