Question
Explain the two models proposed for the origin of the endoplasmic reticulum (ER) in eukaryotes and discuss how ER evolution is linked to the development of protein secretion pathways and the Golgi apparatus.
Answer :
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Two main models have been proposed to explain the origin of the endoplasmic reticulum (ER) in eukaryotes: the invagination model and the vesicular fusion model. The invagination model suggests that the ER originated from the infolding of the plasma membrane into the cytoplasm, creating an internal network of membranes. This process would have enclosed certain cytoplasmic regions and gradually specialized to form the rough and smooth ER, providing distinct domains for protein synthesis and lipid metabolism. The vesicular fusion model, on the other hand, proposes that small vesicles derived from the plasma membrane or pre-existing internal
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