Bacteria shapes and sizes6/22/2023 ![]() ![]() Bacteria are usually the smallest in the logarithmic phase of growth. The size of bacteria also varies with the medium and growth phases. Spirochetes are longer (up to 20 μm) and narrower (0.1 to 1.0 μm). ![]() The vast majority of rod-shaped bacteria cultured in the laboratory are between 0.5 to 4 μm wide and less than 15 μm long.Though we often use diameter to specify cell size, many cells are not spherical in shape.īacteria vary in their cell size, depending on the nature of bacterial cells. For comparison, average eukaryotic cells can be 10 to more than 200 μm in diameter. coli, are about 1×2 μm, typical of most prokaryotes. To illustrate how small a bacterium is, consider that 500 bacteria of one μm in length could be placed end-to-end across the period at the end of this sentence.įor example, the dimensions of an average rod-shaped bacteria, E. The measurement used for microorganisms is micrometer (μm) 1 μm = 0.001 millimeter 1 nanometer (nm) = 0.001 μm. ![]() The bacteria range in size from Mycoplasma, the smallest, to Bacillus anthracis, one of the largest. Sizes of representative bacteria, viruses, yeasts, and human cells. ![]()
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