Multiple Choice
Which of the following is not a pathway of exocytosis?
13. Intracellular Protein Transport
Exocytosis
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When a vesicle fuses to the plasma membrane what happens to the lipids in the vesicles?
A
They are released with the contents of the vesicle
B
They are degraded
C
They are incorporated into the plasma membrane
Verified step by step guidance1
Understand the process of vesicle fusion: Vesicle fusion is a key step in exocytosis, where a vesicle merges with the plasma membrane to release its contents outside the cell.
Recognize the role of lipids: Vesicles are composed of a lipid bilayer, similar to the plasma membrane. This structural similarity is crucial for the fusion process.
Identify the fate of vesicle lipids: During fusion, the lipid bilayer of the vesicle becomes continuous with the plasma membrane, allowing the lipids to integrate into the plasma membrane.
Consider the implications: The incorporation of vesicle lipids into the plasma membrane helps maintain membrane integrity and fluidity, and can also contribute to membrane expansion.
Conclude the process: The contents of the vesicle are released into the extracellular space, while the lipids from the vesicle become part of the plasma membrane, supporting cellular functions.
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