Bacteria display a wide diversity of shapes and sizes, called morphologies. Bacterial cells are about one-tenth the size of eukaryotic cells and are typically 0.5–5.0 micrometres in length. However, a few species are visible to the unaided eye — for example, Thiomargarita namibiensis is up to half a millimetre long and Epulopiscium fishelsoni reaches 0.7 mm. Among the smallest bacteria are members of the genus Mycoplasma, which measure only 0.3 micrometres, as small as the largest viruses. Some bacteria may be even smaller, but these ultramicrobacteria are not well-studied. COUNT 5
QSN1 Are bacteria cells smaller than eukaryotic cells? ANS1 one-tenth the size QSN2 What is the common name for shapes and forms of bacteria? ANS2 morphologies QSN3 How big is Epulopiscium bacteria? ANS3 0.7 mm QSN4 What are one of the smallest bacteria? ANS4 genus Mycoplasma QSN5 Is ultramicrobacteria is well examined? ANS5 not well-studied