![]() Division in random planes produces a staphylococcus arrangement ( see Fig. It is difficult with a conventional light microscope to tell a tetrad arrangement (square of four cocci) from a sarcina arrangement (cube of eight) so in our lab, anytime you see ba square of four cocci, say it is either a tetrad or a sarcina arrangement.ĭ. Division in three planes produces a sarcina arrangement ( see Fig. The answer is that morphology is just another way microorganisms cope with their environment, another tool for gaining a competitive advantage. ![]() Common shapes include spherical (coccus), rod-shaped (bacillus), or curved (spirillum, spirochete, or vibrio). Bacteria are often described in terms of their general shape. cocci): spherical or ovoid (some might be. Bacterial Shapes - Morphology cell shape - Major cell morphologies - Coccus (pl. Microbiology Chapter 7 Microbio Chp 7 pt 3 Chapter 8 Microbio - Reference the textbook for the tables and figures. Most bacteria have cell walls that contain peptidoglycan. 6 - Reference the textbook for the tables and figures. Elevation this describes the side view of a colony. Bacteria are prokaryotic because their genetic material (DNA) is not housed within a true nucleus. Besides, bacteria are characterized on the basis of their shapes into three classes. Tiny colonies are referred to as punctiform. Generally, the bacterium has a spherical, round, or ovoid shape. Scanning electron micrograph of Micrococcus luteusĬ. However, why bacteria should have a particular shape is a question that receives much less attention. These are: Form what is the basic shape of the colony For example, circular, filamentous, etc. Which setting is best to view the moving bacteria and bacterial shape Darkfield mode 2. Division in two planes produces a tetrad arrangement ( see Fig. View labster1.docx from BIOL 2130 at Pellissippi State Community College. Scanning Electron Micrograph of Enterococcusī. However, why bacteria should have a particular shape is a question that receives much less attention. Transmission electron micrograph of Streptococcus Bacterial morphology: why have different shapes The fact that bacteria have different shapes is not surprising after all, we teach the concept early and often and use it in identification and classification. Scanning electron micrograph of Streptococcus pyogenes courtesy of Dennis Kunkel's Microscopy Scanning electron micrograph of a Neisseria, a diplococcus courtesy of Dennis Kunkel's Microscopy Types and different forms of bacterial cells: spherical cocci, rod-shaped bacilli, spiral and other. ![]() Scanning electron micrograph of a Streptococcus pneumoniae, a diplococcus
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