Question

protein synthesis
where does protein synthesis take place?
mitochondria
ribosomes
cytoplasm
nucleolus

Explanation:

Protein synthesis occurs on ribosomes. Ribosomes read the mRNA sequence and assemble amino - acids into polypeptide chains. Mitochondria are mainly for energy production (ATP synthesis), the cytoplasm is the general site where many cellular processes occur but not the specific site for protein synthesis, and the nucleolus is involved in ribosome synthesis not protein synthesis itself.

Answer:

B. Ribosomes