Final answer:
Ribosomes are the cellular structures responsible for protein synthesis. They receive genetic instructions from mRNA and use them to build proteins.
Step-by-step explanation:
Ribosomes are the cellular structures responsible for protein synthesis. They consist of large and small subunits and can be found in practically every cell. Ribosomes receive the genetic instructions encoded in mRNA and translate them into a specific order of amino acids, which are the building blocks of proteins.