AQA A-level BIOLOGY 7402-3 Paper 3 Mark scheme June 2023
Processing
A-level BIOLOGY 7402/3 Paper 3 Mark scheme June 2023
Question Marking Guidance Mark Comments
01.1
1. (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. Accept sodium
ions move in down
a concentration
gradient
5. Accept inside
becomes positive
Price
$21.00
Add To Cart
Buy Now
Regular licenses
| Category | AQA PAPERS AND MARK SCHEME |
| Comments | 0 |
| Rating | |
| Sales | 0 |
Buy Our Plan
Share on
Similar items
Loading
{{ userMessage }}
Cookies!
We use cookies to understand how you use our website and to improve your experience. This includes personalizing content and advertising. To learn more, please click Here. By continuing to use our website, you accept our use of cookies, Privacy policy and terms & conditions.