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Understanding Bacterial Cells: Shapes, Movement, and Reproduction

Explore the world of bacteria, from their different shapes like cocci, bacilli, and spirilla to their means of movement using flagella. Learn how bacteria reproduce, obtain food, and the roles of helpful and harmful bacteria. Antibiotics and bacteria's impact on health are also discussed.

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Understanding Bacterial Cells: Shapes, Movement, and Reproduction

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  1. The Bacterial Cell Bacteria are prokaryotic (cells lack a nucleus)

  2. Shape of Bacteria • Round – cocci • Example – strep – throat (Streptococcus pyogenes)

  3. Shape of Bacteria • Rod-shaped - bacilli • Example – E. coli (Escherichia coli) Usually found in the intestines

  4. Shape of Bacteria • Spiral shaped – spirilla Example – Lyme disease (Borrelia burgdorferi)

  5. Movement of Bacteria Flagella – a long whip-like structure that helps the cell move by spinning in place like a propeller.

  6. A bacterial cell can have many flagella, one or none. • If a bacterial cell does not have a flagella, they depend on air, water or clothing to carry them around.

  7. Reproduction • Bacteria split to reproduce. Some can split every 20 minutes. • video

  8. Obtaining Food • Autotrophs – make their own food.

  9. Obtaining Food • Heterotrophs – obtain food by eating autotrophs or other heterotrophs.

  10. Types of Bacteria • Helpful Bacteria Food: cheese, sauerkraut, pickles, sour cream and yogurt

  11. Helpful bacteria • Nature’s clean-up crew - Bacteria, along with fungus and some insects are decomposers that help break down dead matter. • Click here for a video of decomposing matter. (get ready – this is a little intense!)

  12. Harmful Bacteria • Illness and Health • Strep throat and food poisoning

  13. Antibiotic • A chemical that can kill bacteria.

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