AQA A-level BIOLOGY 7402-3 Paper 3 Mark scheme June 2026

AQA PAPERS AND MARK SCHEME

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A-level BIOLOGY 7402/3 Paper 3 Mark scheme June 2026

Question Marking Guidance Mark Comments

01.1

1. (There are) stretch-mediated sodium ionÃ‚Â

channels (in the membrane);

2. (Increased pressure) deforms/changesÃ‚Â

(sensory neurone/axon) membrane/lamella(e)

(Increased pressure) deforms/changes sodiumÃ‚Â

ion channels;

3. Sodium ion channels open;

4. Sodium ions diffuse in;Ã‚Â

5. Depolarisation (leading to generator potential);

3 max

(3 xÃ‚Â

AO1)

1. 2. 3. or 4. AcceptÃ‚Â

Max 2 if onlyÃ‚Â

reference to sodiumÃ‚Â

and not sodium ions

4. Accept sodiumÃ‚Â

ions move in downÃ‚Â

a concentrationÃ‚Â

gradient

5. Accept insideÃ‚Â

becomes positive

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AQA A-level BIOLOGY 7402-3 Paper 3 Mark scheme June 2026

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