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Bacterial cells like eukaryotic cells possess ribosomes which are the sites of protein synthesis. The ribosomes consist of two subunits and each subunit further consists of protein and a type of RNA popularly called ribosomal RNA or rRNA.
The procaryotic ribosomes are 70 S ribosomes while in eucaryotic cells there are 80S ribosomes. Here S stands for Svedberg unit, named after its discoverer and is based on sedimentation under ultra-high speed centrifugation. The 70S ribosome comprises of small 30S subunits containing one molecule of r RNA and large 50 S subunits containing two molecules of ribosomal RNA. The antibiotics streptomycin, neomycin and tetracycline are effective because of their characteristic to inhibit protein synthesis on the ribosomes.

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