Rough Endoplasmic Reticulum

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Rough Endoplasmic Reticulum

They are a continuous series of membrane-bound flattened sacs within the cell's cytoplasm. They have a rough outer appearance because of the protein-synthesizing particles called ribosomes on them.


The ribosome is a cytoplasmic structure that is minute and sphere-shaped. It is composed of protein and ribonucleic acid (RNA). They serve as the site of protein synthesis.