Why does the Rough Endoplasmic Reticulum look 'rough' under a microscope?

  1. A. Due to the presence of ribosomes on its surface
  2. B. Due to the absence of ribosomes on its surface.
  3. C. Due to the presence of lysosomes on its surface
  4. D. Due to the presence of mitochondria on its surface

Correct Answer: A. Due to the presence of ribosomes on its surface

Explanation

The Rough Endoplasmic Reticulum (RER) is studded with ribosomes on its outer surface, giving it a granular or 'rough' appearance under electron microscopy.

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