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.

29 Jan 2026
Answer :
Word Count : 259
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 __________ ________ _____ ___ ____ ____.
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