Question

what is the site of protein synthesis? nucleus mitochondria ribosome smooth endoplasmic reticulum (er)

Explanation:

Protein synthesis occurs at ribosomes. The nucleus contains DNA which has the genetic - code for proteins but is not the site of synthesis. Mitochondria are involved in energy production. The smooth endoplasmic reticulum is mainly involved in lipid synthesis and detoxification, not protein synthesis.

Answer:

C. Ribosome