Final answer:
Ribosomes are the cellular structures responsible for protein synthesis. They are composed of ribosomal RNA (rRNA) and protein, which work together to translate mRNA sequences into amino acid sequences of polypeptides. This process is essential for protein synthesis in cells.
Step-by-step explanation:
Ribosomes are the cellular structures responsible for protein synthesis. They are composed of ribosomal RNA (rRNA) and protein, with rRNA providing the location for mRNA binding and enzymatic activity. Ribosomes interact with other RNA molecules to assemble amino acids into polypeptide chains, which form proteins based on the genetic instructions held within mRNA molecules.