1 2 TYPES OF BACTERIA: Bacteria - Get food from an outside source Cyanobacteria - Make their own food Bacteria - small one celled monerans Bacteria like a warm, dark, and moist environment They are found almost everywhere: -water -air -soil -food -skin -inside the body
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2 TYPES OF BACTERIA: Bacteria - Get food from an outside source
2 TYPES OF BACTERIA: Bacteria - Get food from an outside source Cyanobacteria - Make their own food Bacteria - small one celled monerans Bacteria like a warm, dark, and moist environment They are found almost everywhere: -water-air -soil-food - PowerPoint PPT Presentation
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2 TYPES OF BACTERIA:Bacteria - Get food from an outside sourceCyanobacteria - Make their own foodBacteria - small one celled moneransBacteria like a warm, dark, and moist environment
They are found almost everywhere:-water -air-soil -food-skin -inside the body-on most objects
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Spiralspirilla
Rod-Shaped bacilli, bacillus
Roundcocci
3 Shapes of Bacteria
Bacteria are classified by shape into 3 groups:
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3 Shapes of BacteriaBacillus anthracis –
(bacillus) – causes the disease anthrax in livestock (cows)Neisseria meningitidis (coccus) – causes meningitis, a life threatening disease where the brain becomes inflammed
Leptospira interrogans – (spirilla)
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• Binary Fission - the process of one organism dividing into two organisms
• Fission is a type of asexual reproduction
Reproduction of Bacteria
• Asexual reproduction- reproduction of a living thing from only one parent
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• The time of reproduction depends on how desirable the conditions are
• Bacteria can rapidly reproduce themselves in warm, dark, and moist conditions
• Some can reproduce every 20 minutes
(one bacteria could be an ancestor to one million bacteria in six hours)
Reproduction of Bacteria
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Bacteria Survival Endospore -a thick celled structure that forms inside the cell• they are the major cause of food poisoning• they can withstand boiling, freezing, and extremely dry conditions• it encloses all the nuclear materials
and some cytoplasm
• allows the bacteria to survive for many years
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Controlling Bacteria3 ways to control
bacteria:1) Canning - the process of sealing food in airtight cans or jars after killing bacteria
* endospores are killed during this process2) Pasteurization - process of heating milk to kill harmful bacteria
3) Dehydrating-removing water from food * Bacteria can’t grow when H2O is removed
example: uncooked noodles & cold cereal
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Harmful Bacteria
Pathogenic bacteria – bacteria which cause disease. Enter a body and take nutrients from the host or produce toxins