IB Biology SL 2.2.5 Synapses as junctions Question Bank
Practise IB Biology SL 2.2.5 by tracing calcium entry, neurotransmitter release, diffusion and receptor binding across a synapse.
- Syllabus
- First assessment 2025
- Course
- Biology SL
- Level
- SL
Exam points
- Explain how calcium entry, vesicle fusion, neurotransmitter diffusion and receptor binding transmit impulses across a synapse.
- Compare presynaptic and postsynaptic membrane roles and link a narrow synaptic cleft to rapid transmission.
C2.2.5—Synapses as junctions question 1
The electron micrograph shows part of a synapse between two neurons.
Question (a)
(a)
Distinguish between the presynaptic and postsynaptic membranes by giving two differences.
[ 2 ]
Question (b)
(b)
The gap between the presynaptic and postsynaptic membranes is very narrow. Suggest an advantage of this.
[ 1 ]
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