Edexcel A level biology
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Edexcel A Level Biology Paper 1 Mark Scheme June 2022 Advanced Biochemistry, Microbiology and Genetics, Edexcel A Level Biology Paper 2 Mark Scheme June 2022: GCE In Biology B (9BI0/02) Paper 2: Advanced Physiology, Evolution and Ecology and Edexcel A Lev
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---3mei 2023
- Edexcel A Level Biology Paper 1 Mark Scheme June 2022 Advanced Biochemistry, Microbiology and Genetics, Edexcel A Level Biology Paper 2 Mark Scheme June 2022: GCE In Biology B (9BI0/02) Paper 2: Advanced Physiology, Evolution and Ecology and Edexcel A Level Biology Paper 3 Mark scheme June 2022: (9BI0) Paper 3: General and Practical Principles in B
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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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---41mei 20232022/2023A+
- 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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STUDYLAB2023