IB Biology HL C2.2.12 Hl Exogenous Chemicals Questions
Practise IB Biology HL 2.2.12 by applying exogenous chemicals concepts to exam questions.
- Syllabus
- First assessment 2025
- Course
- Biology HL
- Level
- HL
Exam points
- Explain how neonicotinoids mimic acetylcholine, bind insect postsynaptic receptors and cause prolonged overstimulation or paralysis.
- Explain how cocaine blocks dopamine reuptake so dopamine accumulates in the synaptic cleft and prolongs excitatory signalling.
- Explain how other exogenous psychoactive chemicals alter neurotransmitter release, reception or synaptic transmission.
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IB Biology HL C2.2.12 Hl Exogenous Chemicals Questions question 1
Cholinergic synapses use acetylcholine as their neurotransmitter. They are widespread in the body, passing on signals to muscle cells. These synapses are affected by neonicotinoid pesticides.
The diagrams, which are not drawn to scale, show the synapse between two neurons and a detail of the synaptic cleft.
On the diagrams, label:
On the diagrams, label with a letter P a location where a neonicotinoid pesticide could bind.
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