Question

When the endoplasmic reticulum is studded with ribosomes on the outer surface of the cisternae, it is called:

• A. Sarcoplasmic reticulum
• B. Smooth endoplasmic reticulum
• C. Granular/Rough endoplasmic reticulum
• D. None of the above

Answer 1

The correct option is C Granular/Rough endoplasmic reticulum

Endoplasmic reticulum (ER) is a system of membrane-lined channels found in all eukaryotic cells except mature erythrocytes. Membranes of ER may bear ribosomes and such an ER is called a granular or rough endoplasmic reticulum (RER). It is abundant in cells engaged in active protein synthesis.

So, the correct answer is 'Granular/Rough endoplasmic reticulum'.