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Ribosomes consist of two major components: the small ribosomal subunit, which reads the RNA, and the large subunit, which 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.rotein synthesis begins at a start codon AUG near the 5' end of the mRNA. mRNA binds to the P site of the ribosome first. The ribosome is able to identify the start codon by use of the Shine-Dalgarno sequence of the mRNA in prokaryotes and Kozak box in eukaryotes.
ribosomes. consists of 2 subunits-made of rna and protein function-site of protein synthesis a cell organelle that functions as the site of protein synthesis inthe cytoplasm. its rna components are constructed in the nucleolus.onsists of 2 subunits-made of rna and protein function-site of protein synthesis a cell organelle that functions as the site of protein synthesis inthe cytoplasm. its rna components are constructed in the nucleolus.