biology unit B6
part one check out part to after you have read this
bye bii
- Created by: Andrei stephen
- Created on: 05-06-13 09:57
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- biology unit B6
- bacteria
- parts of bacteria and their functions
- flagellum (TAIL) used for movement
- cell wall stops the cell from bursting maintains the shape
- DNA used for replication and controlling the cell
- can be different shapes such as rods spheres spirals and crescents
- bacteria reproduce by splitting in two (asexual reproduction called binary fission)
- it is possible to grow bacteria but it must be done in aseptic conditions to avoid cross contamination
- this is known as aseptic conditions
- bacteria are very good at surviving because
- can survive on a large range of energy sources
- they can reproduce fast this means they can spoil food of cause disease as such they need to be handled with extreme care
- parts of bacteria and their functions
- yeast
- can be grown quicker by
- changing food avliblity
- changing temperature
- for every ten degrees rise in tem growth rete double until optimum temperature is reached
- changing PH
- removing waste
- can be grown quicker by
- viruses
- these are small structes made of protein coat that surrounds genetic material
- can only reproduce in other living cells and they only attack soporific cells which can be plant animal or even bacteria
- how a virus reproduces
- attach itself to a host cell
- use the cell to make the compnets for the vireses and then build them
- cause the host cell to split open and die to relse these viruses
- use the cell to make the compnets for the vireses and then build them
- attach itself to a host cell
- harmful microorganisms
- how they spread
- raw food for example salmonella
- in dirty water for example cholera
- direct contact e.g. the common cold
- in the air e.g. the flu
- what happens when they get in the body ?
- it reproduce without causing symptoms
- incubation period
- the microbes then produce toxins
- these cause the symptoms
- it reproduce without causing symptoms
- natural disasters and deiasase spread
- these can increase deiase spread because of
- sewer systems maybe damaged so water becomes contaminated
- food decays because the refrigerators working o food decays
- large numbers of people moving to other areas means many facility's aren't able o cope
- hospitals can be damaged or their may be a shortage of medical staff
- these can increase deiase spread because of
- the tree most important discovery's about diseases
- Louis pasture discovered the germ theory
- joseph leister who used carbolic acid to prevent infection
- sir alexander Fleming who discovered penicillin
- antiseptics and antibiotics
- anti septic are used outside off the body to stop harmful microbes from entering
- antibiotics are used inside the body to kill microbes that have already entered
- antiseptics work on most microbes but antibiotics have no effect on viruses
- some Bactria are becoming immune to antibiotics as they have mutated to rest them then pass this mutation on
- to counter this doctors have only give out antibiotics when really necessary and made sure patients always finish the full corse
- how they spread
- bacteria
- bacteria are very good at surviving because
- can survive on a large range of energy sources
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