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Understanding Bacterial Morphology: Size, Shape, and Arrangement

Learn about how to differentiate bacteria based on their morphology, which includes size, shape, arrangement, and staining characteristics. Discover the various shapes such as cocci, rods, spirillum, and more. Understand the arrangements like streptococcus, staphylococcus, and their characteristics.

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Understanding Bacterial Morphology: Size, Shape, and Arrangement

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  1. Morphology of bacteria

  2. Bacteria can be distinguished from one another by their morphology: • size, • shape, • arrangement, • staining characteristics.

  3. Size • Most bacterial species are approximately 1 micrometer in diameter.

  4. Shape • Bacteria are difficult to differentiate by size, but they have different shapes: • spherical bacteria – cocci • rod-shaped bacteria – rods • a snakelike bacteria – spirillum

  5. Shapes of Bacteria • Coccus • Chain = Streptoccus • Cluster = Staphylococcus • Bacillus • Chain = Streptobacillus • Coccobacillus • Vibrio = curved • Spirillum • Spirochete

  6. Arrangement • Some bacteria form aggregates such as the grapelike clusters of Staphylococcus species or the diplococcus (two cells together) observed in Streptococcus or Neisseria species.

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