Answer:
Endoplasmic reticulum
The endoplasmic reticulum is a network of membranes within the cell through which proteins and other molecules move. Proteins assemble into organelles called ribosomes. When proteins are destined to be part of the cell membrane or exported out of the cell, ribosomes assemble them and add them to the endoplasmic reticulum, giving it a rough appearance.
Step-by-step explanation:
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