Limitless Exam 14.1.5
Transmission at Synapses: Past Paper Questions
Exam Focus: This component tests your understanding of synaptic transmission through authentic Cambridge IGCSE Biology exam-style questions across Papers 2, 4, and 6.
Exam Instructions
- • Section A (MCQ): Select the correct option for each question
- • Section B (Theory): Type your answers using scientific keywords
- • Section C (Application): Apply your knowledge to unfamiliar contexts
- • Click "Reveal Answer" to check mark schemes and examiner guidance
Section A: Sequencing & Multiple Choice (Paper 2)
5 Questions • Test your knowledge of the sequence of events
Place the following events at a synapse in the correct order:
What process moves neurotransmitter molecules across the synaptic gap?
Which structure contains neurotransmitter molecules before they are released?
After neurotransmitter molecules bind to receptor proteins, what happens next?
Which component ensures that impulses can only travel in one direction at a synapse?
Section B: Structured Theory Questions (Paper 4)
5 Questions • Extended response with keyword marking
Describe the events that occur at a synapse when an impulse arrives.
[5 marks]
Describe the structure of a synapse.
[4 marks]
Explain why synapses are important in reflex arcs.
[3 marks]
A student observes a synapse under a microscope. Draw arrows on the diagram below to show the direction of neurotransmitter movement. Label: (i) vesicles, (ii) synaptic gap, (iii) receptor proteins.
[4 marks]
Draw arrows to show neurotransmitter movement. Label: (i) vesicles, (ii) synaptic gap, (iii) receptor proteins
State the role of receptor proteins at a synapse.
[2 marks]
Section C: Application & Analysis (Paper 6)
5 Questions • Apply your knowledge to new contexts
Suggest why synapses slow down the speed of nervous transmission compared to electrical conduction along a neurone.
[2 marks]
Some drugs work by blocking receptor proteins at synapses. Explain the effect this would have on nerve impulse transmission.
[3 marks]
A student investigates reaction time using a ruler drop test. Explain why synapses affect reaction time.
[3 marks]
In an investigation, scientists measure the concentration of neurotransmitter in the synaptic gap over time. Sketch a graph to show how concentration changes after an impulse arrives. Label the axes.
[3 marks]
Sketch your graph below. Remember to label both axes!
Suggest why having multiple synapses in a reflex arc might be advantageous despite causing a delay.
[2 marks]
🎯 Limitless IGCSE Biology
Master synaptic transmission with Cambridge-aligned exam questions
Keywords are King • Always use DIFFUSION and RECEPTOR in synapse answers
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