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The Bacterial Ribosome. The bacterial ribosome is a cytoplasmic nucleoprotein particle whose main function is to serve as the site of mRNA translation and protein synthesis. The ribosome has a mass of about 2.5 MDa, with RNA accounting for 2/3 of the mass.It consists of two subunits denoted 30S (small subunit) and 50S (large).uring protein synthesis a ribosome moves along an mRNA molecule, reading the codon and adding the correct amino acid (from the corresponding aminoacyl tRNA) to the growing protein. When a stop codon is reached,translation ceases, and the mRNA and protein are released.
The primary function of Ribosomes is to read and translate the cell's genetic code, then reproduce (replicate) the proteins that the code represents. Without the ribosomes this coded message could not be read or replicated.ibosomes are used in the synthesis of proteins and enzymes required by the cells for various purposes. Most of our cellular chemical reactions are enhanced (catalyzed) by enzymes, in order for the cells to function properly. Ribosomes make proteins for use in the cell and for export.