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Life Science. Bacteria: The Good, The Bad and The Ugly. Brief Review. Sphere-shaped bacteria (cocci) sometimes grow in chains or in clumps like a bunch of grapes. Bacterial Shapes: COCCI. Streptococcus (strep throat) Staphylococci (responsible for "staph" infections and gangrene).

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life science

Life Science

Bacteria: The Good, The Bad and The Ugly

bacterial shapes cocci

Sphere-shaped bacteria (cocci) sometimes grow in chains or in clumps like a bunch of grapes.

Bacterial Shapes: COCCI

Streptococcus(strep throat)Staphylococci (responsible for "staph" infections and gangrene)

bacterial shape bacillus

Rod-shaped bacteria (bacilli) can also form in chains. Some types of these bacteria also have whiplike structures called flagella to help them move around.

Escherichia coli or E.coli(found in the intestines of mammals)Salmonella typhi(causes typhoid fever and food poisoning)

Bacterial Shape: BACILLUS
bacterial shape spirilla

Spiral-shaped bacteria (spirilla) can use their shape to propel themselves by twisting like a corkscrew.

Treponema pallidumcholera(syphilis)Borrelia burgdorferi (Lyme disease)

Bacterial Shape: SPIRILLA
the good not all bacteria are harmful
THE GOOD:Not all bacteria are harmful.
  • Bacteria as decomposers

Underside of a leaf enlarged 5000x

nitrogen fixing bacteria
Nitrogen Fixing Bacteria
  • Some bacteria have the ability to absorb nitrogen and change it into a form usable by plants
  • We eat the plants or the animals that ate the plants and we get that nitrogen
  • Plants such as clover, peas, beans -legumes


Fermentation- the breakdown of some nutrient molecule(usually sugar) into alcohol or some other food molecule such as:
  • Wine and cider are turned into vinegar
  • Sauerkraut from cabbage
  • Pickles from cucumber
  • Silage from corn
  • Linen from flax
  • Dairy products-yogurt, cheese,
  • Cottage cheese from sour milk
  • Holes in Swiss cheese from gases generated by bacteria
the bad pathogenic bacteria disease causing
THE BAD:Pathogenic bacteria-disease causing
  • Food poisoning-botulism
  • Halitosis
  • Tooth decay
  • anthrax

the ugly what bacteria can do
The UGLYWhat bacteria can do….

Corn blight

Tooth decay

Rash of lyme disease


your assignment research and powerpoint presentation
Your Assignment:Research AND powerpoint presentation
  • Choose one GOOD and one BAD bacteria
  • GOOD
    • how product is made and how bacteria are involved
  • BAD
    • what disease How is infection spread
    • Symptoms picture /scientific name
    • Treatment where bacteria is found