Multiple Choice
Which of the following molecules is able to increase the rigidity and decrease the flexibility of a membrane?
8. Membrane Structure
The Lipid Bilayer
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When the cytosolic face of a vesicle membrane fuses with the cytosolic face of the plasma membrane, all of the lipids found in the cytosolic face remain facing the cytoplasm.
A
True
B
False
Verified step by step guidance1
Understand the process of vesicle fusion: Vesicle fusion with the plasma membrane is a key process in cellular transport, where the vesicle membrane merges with the plasma membrane, allowing the contents of the vesicle to be released outside the cell or into the membrane itself.
Identify the orientation of the lipid bilayer: Both the vesicle membrane and the plasma membrane are composed of lipid bilayers. Each bilayer has two faces: the cytosolic face (facing the cytoplasm) and the exoplasmic face (facing away from the cytoplasm).
Consider the conservation of membrane orientation: During the fusion process, the orientation of the lipid bilayer is preserved. This means that the cytosolic face of the vesicle membrane remains facing the cytosol after fusion.
Apply the concept to the problem: Since the orientation is preserved, the lipids that were originally on the cytosolic face of the vesicle membrane will continue to face the cytosol after the vesicle fuses with the plasma membrane.
Conclude based on the understanding: Given that the orientation of the lipid bilayer is maintained during fusion, the statement that all of the lipids found in the cytosolic face remain facing the cytoplasm is true.
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