![]() ![]() This exercise will help you identify the cultural characteristics of a bacterium on an agar plate - called colony morphology. Although bacterial cells are much smaller and simpler in structure than eukaryotic cells, the bacteria are an exceedingly diverse group of organisms that differ in size, shape, habitat, and metabolism. Every good argument is improved by a good example, and the best example of how valuable bacterial shape must be is supplied by Caulobacter crescentus. One explanation was given 23 years ago 1 based on suggestive evidence from Streptococcus pyogenes 2 and Bacillus subtilis (Doyle, unpublished) that the poles of Gram-positive cocci and rods were metabolically inert. ![]() In the identification of bacteria and fungi much weight is placed on how the organism grows in or on media. ![]() 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.
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