Final answer:
Proteins are made on ribosomes in cells using genetic instructions from DNA. Messenger RNA (mRNA) provides the code for protein synthesis, which is read by ribosomes to string together amino acids into proteins.
Step-by-step explanation:
Proteins are made on the ribosomes in the cytoplasm of cells. The DNA in the nucleus contains the genetic instructions to make proteins. However, DNA does not directly make proteins, instead, it uses an RNA intermediate called messenger RNA (mRNA). Ribosomes read the genetic information on mRNA and use it to string together the amino acids into a protein.