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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 main function of ribosomes is to make up 25% of the dry weight of cells (e.g., pancreas cells) that specialize in protein synthesis.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.