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QUESTIONS AND ANSWERS

QUESTIONS AND ANSWERS

QUESTIONS AND ANSWERS

AQA A level BIOLOGY 7402/3 Paper 3 Mark scheme June 2023. (There are) stretch-mediated sodium ion channels (in the membrane); 2. (Increased pressure) deforms/changes (sensory neurone/axon) membrane/lamella(e) OR (Increased pressure) deforms/changes sodium ion channels; 3. Sodium ion channels open; 4. Sodium ions diffuse in; 5. Depolarisation (leading to generator potential); 3 max (3 x AO1) 1. 2. 3. or 4. Accept Na+ Max 2 if only reference to sodium and not sodium ions 4. Accep...

A-level BIOLOGY Paper 3 Time allowed: 2 hours Materials For this paper you must have: • a ruler with millimetre measurements • a scientific calculator. Instructions • Use black ink or black ball-point pen. • Fill in the boxes at the top of this page. • Answer all questions in Section A. • Answer one question from Section B. • You must answer the questions in the spaces provided. Do not write outside the box around each page or on blank pages. • If you need extra...

AQA A LEVEL BIOLOGY 7402/3 Question Paper and Mark scheme {MERGED} JUNE 2022

AQA A LEVEL BIOLOGY 7402/3 Question Paper and Mark scheme {MERGED} JUNE 2022

AQA A LEVEL BIOLOGY 7402/3 Question Paper and Mark scheme {MERGED} JUNE 2022