classification structure procaryotic unicellular organisms which are found everywhere. small group...
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CLASSIFICATION
STRUCTURE
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• procaryotic unicellular organisms which are found everywhere.•Small group of bacteria are harmful but generally bacteria are benefit (useful). •Useful bacteria are used in the production of yoghurt and cheese.
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• Some bacteria cause diseases. This type of bacteria is called pathogenic bacteria.
• Pathogenic bacteria cause disease such as tuberculosis, cholera, diptheria, pneumonia, typhoid and teeth decay.
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• *have cell membrane, cytoplasm, and hereditary material (DNA).
• *have also cell wall.• *Have ribosomes to produce
protein.
STRUCTURE OF BACTERIA
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•Some bacteria have mesosome
• Aerobic respiration takes place in mesosome of bacteria.
• Energy is produced at the end of the aerobic respiratoin.
• Reproduce by binary fission.
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•Some bacteria may contain free chlorophyll in its structure..
• Most bacteria also have flagella to provide motion.
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Types of bacteria according to their shape; a)
Bacillus b) Coccus c) Vibrio d) Spirillia
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Types of bacteria according to their nutrition
•Hetetrophs•Autotrophs
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1. Autotrophic Bacteria:
• can synthesize their own food.
• If bacteria use sunlight as an energy source, they are known as phototrophs.
• However some bacteria obtain their energy from NH3 ad H2O. This type of bacteria are called chemotrophs.
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2. Hetetrophic Bacteria: obtain their foodstuffs from other organisms.
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*Sabrobes (Saprophytes) are hetetrophs which live on dead organisms.
• They decompose dead organisms.
• They have an important role in the recycling of material such as Nitrogen.
• Some hetotrophic bacteria are parasitic.
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Types of bacteria according to their oxygen dependency;
a)Anaerobic bacteria
b)Aerobic bacteria
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•Aerobic bacteria are require O2 to obtain energy from food. •Anaerobic bacteria don‘t need oxygen for production of energy.
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Types of bacteria according to the gram staining;
a)Gram (+): A group of bacteria which paints with gram stain.
b)Gram (-): A group of bacteria which doesn't paint with gram stain.
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Types of bacteria according to their flagella;
a) Flagellate:A group of bacteria that have flagella.
b)Non-flagellate: A group of bacteria that don’t have flagella.
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• Bacteria reproduce both sexually and asexually.
• They divide into 2 parts to form new offsprings by binary fission.
• They reproduce sexually by Conjugation.
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