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Ribosomes consist of two major subunitsâthe small ribosomal subunit reads the mRNA, while the large subunit joins amino acids to form a polypeptide chain. Each subunit is composed of one or more ribosomal RNA (rRNA) molecules and a variety of proteins.
Ribosomes are composed of two different subunits, called the large subunit and the small subunit. Both subunits are composed of rRNA and protein. These subunits usually exist separately in the cytoplasm until the small subunit recognizes and binds to a specific sequence of an mRNA message.ibosomes are composed of two different subunits, called the large subunit and the small subunit. Both subunits are composed of rRNA and protein. These subunits usually exist separately in the cytoplasm until the small subunit recognizes and binds to a specific sequence of an mRNA message.