what would be the fate of the membrane associated with a vesicle that has just secreted its cargo by exocytosis?
In cell biology, a vesicle is a cellular organelle that is located inside and outside the cell and consists of a fluid surrounded by a bilayer lipid membrane. Vesicles are formed naturally during the processes of secretion (cellular excretion), absorption (cellular insertion), and transport of substances into the cell. Vesicles can be prepared artificially, in which case they are called liposomes. If the membrane is composed of a single lipid layer, then it is called mono-lamellar lipid vesicles, and in other cases it is called multi-platelet vesicles. The membrane surrounding the cell is also a lamellar phase, and similarly to the plasma membrane and the vesicle membrane can fuse with the plasma membrane to release its contents outside the cell. The vesicles can fuse with other organelles in the cell.
what would be the fate of the membrane associated with a vesicle that has just secreted its cargo by exocytosis?
What would be the fate of the membrane associated with a vesicle that has just exocytosed its cargo?
a) It is degraded by cytosolic enzymes and its constituents are recycled by the cell.
b) The empty vesicle fuses with a lysosome, which then degrades it.
c) The entire vesicle is exocytosed, such that the membrane components enter the extracellular fluid.
d) During exocytosis, the vesicle membrane fuses with the plasma membrane and becomes part of it.
e) The empty vesicle goes back to the Golgi apparatus to pick up another load.
d) During exocytosis, the vesicle membrane fuses with the plasma membrane and becomes part of it.
what would be the fate of the membrane associated with a vesicle that has just secreted its cargo by exocytosis?
How are vesicles carried from the Golgi apparatus to the plasma membrane?
COPI coat proteins are used between parts of the Golgi apparatus as well as to form vesicles going from the Golgi back to the ER. Finally, clathrin forms the vesicles leaving the Golgi for the plasma membrane as well as for vesicles formed from the plasma membrane for endocytosis.