B6 - Quick Summary

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  • Created on: 10-06-12 14:44
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B6 Summary Created on 6/10/2012 3:30:00 PM
B6 ­ Summary
Bacteria are microscopic organisms. Some bacteria are harmful while others have many
useful uses. Bacteria have 4 main shapes these are:
1. Spherical
2. Rod
3. Spiral
4. Curved Rod
Harmful Bactria is treated and destroyed by antibiotics which can be taken in different
forms such as digestion or as a vaccine in the body inserted by injection.
Although Bacteria are classed as a living organism there cells lack things such as:
- A True Nucleus
- Chloroplasts
- Mitochondria
- A Vacuole
However they instead have:
- A Cell Wall ( is a device to maintain the
shape of the cell and also to stop the
cell from bursting )
- A Flagellum ( Used to `swim' around
the body/organism/food source)
- Bacterial DNA (Just floats about) (
Controls the movement of the Bacteria
Bacteria can exploit a wide range of habitats.
Bacteria, fungi, protozoa and viruses are all microorganisms because they are to small
to see with the naked human eye and can only be seen through a microscope. Pasteur,
Fleming and Lister all pioneered the treatment of diseases. Fleming discovered penicillin,
Pasteur proved that microorganisms in the air caused food to go bad and Lister invented
the first antiseptic (carbolic acid to stop infection of the wounds). Food poisoning is
caused by slamoella and E.coli bacteria, The bacteria vibrio causes cholera. The
protozoan Entamoeba causes dysentery. These diseases can be rapidly spread by
natural disasters such as floods. Viruses can cause influenza.
The fungus years carries out fermentation to make alcohol in the production of beer, wine
and gasohol however this can only be done when the yeast respires anaerobically. Beer
is pasteurised to destroy any remaining yeast to stop thrush and also to destroy any
unwanted bacteria.
Life in Soil and Water
Charles Darwin Highlighted the importance of earthworms in agriculture ­ earthworms
mix up the layers creating a more fertile soil as the nutrients from the bottom layers are
brought to the top and the nutrients from the top can be brought down to the other deeper
roots of plants. Aerating and draining also improves the soil but earthworms are the first
choice. Earthworms help to improve the structure and fertility of the soil.
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B6 Summary Created on 6/10/2012 3:30:00 PM
Bacteria are involved in the nitrogen cycle which revolves around the 3 main types:
1. Denitrifying bacteria ( Converts nitrates back into nitrogen gas )
2. Nitrifying bacteria ( Converts ammonia into soluble nitrates ­ Nitrosomonas and
3. NitrogenFixing Bacteria ( Converts nitrogen in the air to ammonia or nitrates and
then into amino acids to form proteins ­ Azotobacter, Clostridium and Rhizobium)
Phytoplankton and Zooplankton live in water.…read more


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