Question

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

Explanation:

The rough endoplasmic reticulum (rough ER) has ribosomes attached to its surface. Ribosomes are responsible for protein synthesis, so the main role of rough ER is protein synthesis. Glucose synthesis is related to processes like photosynthesis or gluconeogenesis, not rough ER. Production of ATP occurs in mitochondria, not rough ER.

Answer:

A. protein synthesis