Which of the following structures produces proteins in both eukaryotic and

prokaryotic cells?

A. Nucleus

B. Cytoplasm

C. Mitochondrion

D. Ribosome

Answer:Cells need to make proteins ... While a structure such as a nucleus is only found in eukaryotes, every cell needs ribosomes to manufacture proteins. Since there are no membrane-bound organelles in prokaryotes, the ribosomes float free in the cytosol. Ribosomes are found in many places around a eukaryotic cell.

The answer is D. Ribosome