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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 ribosomes present in the prokaryotes function differently in protein production than the ribosomes of the eukaryote organisms. The ribosomes of bacteria, archea and eukaryotes differ significantly from each other in structure and RNA sequences.lant cell do have ribosomes and they are composed of proteins and ribosomal RNA. The ribosomes in a plant cell are found in the cytoplasm, the surface of the rough e ndoplasmic reticulum, the mitochondria and on chloroplasts. There are two types of ribosomes-free ribsomes and attached ribosomes.