(C) Ribosomes are small,dense,granular structures composed of $RNA$ and proteins. They are the sites where amino acids are assembled into polypeptide

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(C) Ribosomes are small,dense,granular structures composed of $RNA$ and proteins. They are the sites where amino acids are assembled into polypeptide chains,a process known as protein synthesis. Therefore,ribosomes are often referred to as the protein factories of the cell.