alleryStart learning →Potocytosis differs from ordinary pinocytosis in using which coating protein?
AClathrin, on the outer membrane face
BAlbumin, drawn in from the blood plasma
CCaveolin, on the cytoplasmic membrane face
DIntegrin, spanning the whole bilayer
Answer & Solution
Correct answer: C. Caveolin, on the cytoplasmic membrane face
1. Potocytosis is a variation of pinocytosis.
2. It uses a coating protein called caveolin on the cytoplasmic side of the plasma membrane.
3. Caveolin performs a function similar to clathrin, but clathrin is the coat used in phagocytosis and receptor-mediated endocytosis.
4. Vesicles formed in caveolae are smaller than those made in pinocytosis.
5. Potocytosis can also carry small molecules right through the cell for release on the other side, a process called transcytosis.
6. Albumin is a blood protein and integrins are membrane spanning proteins, so neither is a vesicle coat.
_Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 5 "Structure and Function of Plasma Membranes", section 5.4 Bulk Transport_
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