Microbes

microbes third year level

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what are the microbes?
Bacteria, viruses and fungi. they can be harmful or helpful
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what are the properties of: viruses, yeast, bacteria
viruses- can only replicate inside other cells yeast- unicellular organism, reproduces by budding, involved in the making of bread, beer and wine bacteria- comes in the forms of spiral, rod and disk, involved in the making of cheese/yoghurt
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what are the properties of general microbes?
grow rapidly, can be found anywhere on earth, microscopic living organisms
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what are disinfectants?
chemicals designed to remove microbes
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what are antibiotics?
chemicals often made by fungi that kill bacterial cells.
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what is the word equation for fermentation in yeast?
sugar ---yeast---> alcohol+co2+ a little energy
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why are there more than one 1 antibiotic?
Because no antibiotic is effective against all bacteria. people may have an allergic reaction to one type. resistant strains are appearing.
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why doesn't the doctor give me antibiotics for a cold?
colds and flu infections are viruses. fungi will not kill them
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why doesn't the doctor always give me antibiotics?
bacteria are evolving and beginning to become resiliant to antibiotics. this is because of the overuse of them.
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what does sensitive/ resistant mean?
sensitive- growth is prevented by the antibiotic resistant- no affect caused by the antibiotic
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why does milk turn sour?
this is due to the action of bacteria. the bacteria use the sugar in the milk (lactose) as a food source and produce lactic acid as a by-product. Lactose---bacteria---> lactic acid
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How is lactic acid used in cheese and yoghurt production?
Lactic acid is used to curdle the milk
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how is biogas produced?
By adding bacteria to organic waste and it then gives of methane gas (biogas)
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what is biological filtration?
it is the breakdown of organic material using microorganisms. complete breakdown of the sewage is only possible in aerobic conditions.
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How is oxygen provided in biological filtration?
BY injecting compressed air and stirring
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what problems occur when dumping untreated sewage into rivers?
increased no. of bacteria/ microorganisms, decreased concentration of oxygen in water, decreased biodiversity, can cause disease
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what are the properties of: viruses, yeast, bacteria

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viruses- can only replicate inside other cells yeast- unicellular organism, reproduces by budding, involved in the making of bread, beer and wine bacteria- comes in the forms of spiral, rod and disk, involved in the making of cheese/yoghurt

Card 3

Front

what are the properties of general microbes?

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Card 4

Front

what are disinfectants?

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Card 5

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what are antibiotics?

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