![]() This exercise will help you identify the cultural characteristics of a bacterium on an agar plate - called colony morphology. These oval or spherical bacteria are among the most common types of bacteria known. Certain types of bacteria are rounder in shape, whilst others are shaped like rods, and some have a really unusual shape. The shapes are subdivided according to the arrangement of. Less common shapes are spirochaetes (corkscrew) and vibrios (comma). The three main shapes of bacteria are coccus (spherical). In fact, some bacteria have unusual shapes. The most common bacteria, including pathogens, are Mesophiles with an optimum temperature of about 37 0 C. bacteria are classified as Mesophiles, Thermophiles, and Psychrophiles. In the identification of bacteria and fungi much weight is placed on how the organism grows in or on media. This layer is only 2 to 3 nm thick in Gram-negative bacteria. Some are round while others are rod-shaped. Based on the arrangement of cells they are further sub-grouped as Monococci. A colony is defined as a visible mass of microorganisms all originating from a single mother cell, therefore a colony constitutes a clone of bacteria all genetically alike. Just as all eukaryotic cells have certain features in common, however, many attributes of bacteria are universal. A colony is defined as a visible mass of microorganisms all originating from a single mother cell, therefore a colony. ![]() Bacteria grow on solid media as colonies. different types of bacteria span a variety of shapes and sizes, as described in the following section. Jackie Reynolds, Professor of Biology ( Richland College) 8: Bacterial Colony Morphology is shared under a not declared license and was authored, remixed, and/or curated by LibreTexts. ![]() See variations in colonial morphology among various species of bacteria.īacteria grow on solid media as colonies. Some of the more common types of bacteria that are pathogenic, or disease-causing.
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