Download - Bacteria
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Bacteria
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• Bacteria• Origin and early evolution• Morphology• Cellular structure• Growth and reproduction• Movement• Classification and identification• Fun facts
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Bacteria• bac·te·ri·um
• Prokaryotic cells
• Bacteria were among the first life forms to appear on Earth
• Antony Leeuwenhoek was the first person to see bacteria
• Bacteria inhabit soil, water, acidic hot springs, radioactive waste and the deep portions of Earth's crust
• Parasitic bacteria inhabit living organisms
• Bacteriology,
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Origin and early evolution
The ancestors of modern bacteria:• were unicellular microorganisms • first forms of life to appear on Earth,• about 4 billion years ago
For about 3 billion years bacteria and archaea were the dominant forms of life
2008, fossils of macroorganisms were discovered
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Morphology• Bacteria display a wide diversity of shapes
and sizes, called morphologies.
• 0.5–5.0 micrometres
• Some bacteria may be even smaller, but these ultramicrobacteria are not well-studied
• Some bacteria may be up to 0,7 mm long
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Cellular structure
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Growth and reproduction• Bacteria can grow and divide extremely
rapidly• Bacterial populations can double as
quickly as every 9.8 minutes• reproduce through binary fission( a form
of asexual reproduction)• In the laboratory, bacteria are usually
grown using solid or liquid media.• Bacterial growth follows four phases.
( lag phase, log phase, stationary phase and death phase)
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Binary fission
Bacterial growth
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Movement• Forward movement (swimming) and
tumbling.• Flagella are used for swimming through
fluid• Bacterial gliding and twitching
motility move bacteria across surfaces
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Classification and identification
• Bacterial taxonomy• Phylogeny• Metabolism• Environment• Morphology• Pathogenicity
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Three domain systemThe three-domain system is a biological
classification introduced by Carl Woese
Three life domains (Eukaryotes, Bacteria and Archaea)
1) Archaea- prokaryotic, no nuclear membrane
2) Bacteria- prokaryotic, no nuclear membrane
3) Eukaryotes- organisms that contain a membrane-bound nucleus.
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Fun facts• You’re More Bacteria Than Human
• You Eat Bacteria. On Purpose. And You Probably Like It
• If you collect all the bacteria of your body, then it will weigh 4 pounds.
• There is a type of microbes called “ACTINOMYCETES” are responsible for the smell of rain.
• On average, mobile phones have more bacteria than handles of toilet.
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• After cleaning your mouth, you still have more than 10,000 bacteria on each tooth.
• If you love money then you should also know that there are 300 different types of bacteria living on a dollar bill.
• CHOCOLATE is antibacterial and it protects your teeth and fight against viruses that causes tooth decay.
-Fun facts part 2
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Thank you for your attention!