Question

which of these is the primary site of protein synthesis?
mitochondria
cytoplasm
nucleus
ribosomes

Explanation:

Ribosomes are the organelles where translation occurs, which is the process of protein synthesis. They read the mRNA sequence and assemble amino - acids into polypeptide chains. Mitochondria are for energy production, the cytoplasm is the general cell environment, and the nucleus contains DNA but is not the direct site of protein synthesis.

Answer:

D. ribosomes