Exam (elaborations)
Neuronal communication
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Neuronal communication
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Neuronal
communication.
Mark Scheme 2
Level A Level
SubjectBiology
Exam Board OCR
TopicCommunication, homeostasis and energy
Sub-Topic Neuronal communication
BookletMark Scheme 2
Time Allowed: 75 minutes
Score: / 62
Percentage: /100
Grade Boundaries:
A* A B C D E U
>85% 77.5% 70% 62.5% 57.5% 45% <45%
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Question Answer Marks Guidance
1 (a) Mark the first answer. If the answer is correct
and an additional answer is given that is
incorrect or contradicts the correct answer
cell signalling ; then = 0 marks
1
1 (b) (i) Mark the first answer. If the answer is correct
and an additional answer is given that is
incorrect or contradicts the correct answer
then = 0 marks
synaptic (cleft / space / gap) ;
ALLOW synapse
1 DO NOT CREDIT synoptic / synopse / synapsis
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For more awesome GCSE and A level resources, visit us at
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Question Answer Marks Guidance
1 (b) (ii) DO NOT CREDIT a mark point if stated that
complete vesicles (even if
containing neurotransmitter)
are involved
1 (named) neurotransmitter / acetylcholine , released
from 1 release of neurotransmitter must be clearly
pre-synaptic / first , cell / membrane ; stated
2 diffuses across , gap / cleft / synaptic cleft
or 2 IGNORE synapse
reaches second , neurone / cell / membrane , by
diffusion ;
3 attaches to , receptors / binding sites of sodium 3 DO NOT CREDIT post-synaptic knob / bulb
channels ,
on post-synaptic membrane / membrane of second Note that a statement reading:
cell ; ‘Diffuses across and attaches to receptors on the
post-synaptic membrane’ = 2 marks (mps 2 &
2
3)
max
1 4 CREDIT ref to action of
4 neurotransmitter / acetylcholine , broken down (in
cholinesterase Use of three terms
cleft) ; QWC – technical terms used appropriately and
from:
spelt correctly ; neurotransmitter, acetylcholine,
pre-synaptic / presynaptic, diffuse /
diffusion, synaptic cleft, receptor,
post-synaptic / postsynaptic
Please insert a QWC symbol next to the
pencil icon, followed by
a tick (🗸) if QWC has been
awarded or a cross (🗴) if QWC
has not been awarded
You should use the green dot to identify
the QWC terms that you are crediting.
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