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IB Biology HL B2.1.13 Hl Membrane Fluidity and Vesicles Questions

Explore how fluid phospholipid bilayers form, move and fuse vesicles to transport materials by endocytosis and exocytosis in IB Biology HL B2.1.13.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Explain how membrane fluidity allows vesicles to bud from and fuse with membranes.
  • Describe endocytosis as membrane invagination around material followed by pinching off to form an internal vesicle.
  • Explain exocytosis as vesicle fusion with the plasma membrane to release material, and describe vesicle transport between cell compartments.

IB Biology HL B2.1.13 Hl Membrane Fluidity and Vesicles Questions question 1

[Maximum number: 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.

Figure for Question IB Biology HL B2.1.13 Hl Membrane Fluidity and Vesicles Questions question 1 — IB Biology HL

On the diagrams, label:

On the diagrams, label with a letter E a vesicle involved in exocytosis.

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