Question

what is the main role of rough er? protein synthesis production of atp glucose synthesis

Explanation:

The rough endoplasmic reticulum (rough ER) has ribosomes attached to its surface, and ribosomes are responsible for protein synthesis. Production of ATP is done by mitochondria, and glucose synthesis (like in photosynthesis or gluconeogenesis) is not the main role of rough ER. So the correct option is "protein synthesis".

Answer:

protein synthesis (the option labeled "protein synthesis")