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Bacterial Structure
Function of parts:
· flagellum for movement,
· cell wall to maintain
shape and to stop it
from bursting,
· bacterial DNA to control
the cell's activities and
replication of the cell
Bacterial cells lack: a true nucleus, mitochondria,
chloroplasts, vacuole…read more

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Bacterial Structure
· The main shapes of bacteria are: spherical, rod,
spiral, curved rods
· Bacteria reproduce by a type of asexual
reproduction called binary fission, they can be
grown in fermenters…read more

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Bacteria Feeding
· Most bacteria consume organic nutrients e.g.
carbohydrates and proteins
· Some bacteria can make their own food
· They use chemicals such as hydrogen sulfide
or ammonia to make organic nutrients
· They can live on a wide range of habitats
because of this.
· Very rapid reproduction of bacteria can result
in food spoilage and spread of disease…read more

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Useful Bacteria
· Some bacteria are useful in:
­ yoghurt making,
­ cheese production,
­ vinegar production,
­ silage production,
­ composting…read more

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Making Yoghurt
· All the equipment is sterilised
· Milk is pasteurised by heating to 95oC for 20
minutes, then cooled to 46oC
· A bacterial culture is added and milk is
incubated at 46oC for about 4 hours
· Samples are taken to find out when the yoghurt
is ready
· Flavours and colours are added
· Yoghurt is cooled and packed ready for sale…read more

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