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Micro-organisms <ul><li>What are they? </li></ul><ul><li>What do they do? </li></ul><ul><li>How do we stop them? </li></ul>
Why do we keep food in the fridge?
Why wipe the kitchen surface after preparing food?
How do living things help make this?
What has happened to this foot?
How did living things help to make this?
Who are these?
Micro-organisms <ul><li>Most microbes are harmless. In fact we have millions in our gut that help us. This is called  flor...
Micro-organisms <ul><li>There are 2 main types of micro-organisms: </li></ul><ul><li>BACTERIA   VIRUSES </li></ul><ul><li>...
Bacteria
Bacteria  <ul><li>Do  not  contain a  nucleus  – just coiled strands of  DNA </li></ul><ul><li>Destroy human cells or prod...
 
 
Bacteria <ul><li>Diseases   Symptoms </li></ul><ul><li>- tuberculosis    coughing up blood </li></ul><ul><li>- impetigo   ...
 
 
 
 
VIRUSES <ul><li>Smallest known organisms </li></ul><ul><li>Can only multiply inside animal or plant cells </li></ul><ul><l...
 
Viruses  <ul><li>Viruses latch on to a host cell using chemical hooks on their protein coat, and 'drill' through the host ...
Viruses  <ul><li>DISEASES: </li></ul><ul><li>HIV (leads to AIDS) </li></ul><ul><li>‘ flu </li></ul><ul><li>SARS </li></ul>...
 
 
 
 
Cell wall Tail Slime layer DNA
 
Protein Coat DNA
 
 
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Ags Microbes

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Ags Microbes

  1. 1. Micro-organisms <ul><li>What are they? </li></ul><ul><li>What do they do? </li></ul><ul><li>How do we stop them? </li></ul>
  2. 2. Why do we keep food in the fridge?
  3. 3. Why wipe the kitchen surface after preparing food?
  4. 4. How do living things help make this?
  5. 5. What has happened to this foot?
  6. 6. How did living things help to make this?
  7. 7. Who are these?
  8. 8. Micro-organisms <ul><li>Most microbes are harmless. In fact we have millions in our gut that help us. This is called flora . </li></ul><ul><li>A microbe that is harmful is called a PATHOGEN and is said to be PATHOGENIC </li></ul>
  9. 9. Micro-organisms <ul><li>There are 2 main types of micro-organisms: </li></ul><ul><li>BACTERIA VIRUSES </li></ul><ul><li>Single celled organisms - smallest known </li></ul><ul><li>Uses: organisms </li></ul><ul><ul><li>Making yoghurt - can only reproduce </li></ul></ul><ul><ul><li>Decaying dead plants/ inside living cells </li></ul></ul><ul><ul><li>animals </li></ul></ul>
  10. 10. Bacteria
  11. 11. Bacteria <ul><li>Do not contain a nucleus – just coiled strands of DNA </li></ul><ul><li>Destroy human cells or produce toxins (poisons) </li></ul><ul><li>E.g. clostridium botulinum is a bacterium that produces a deadly toxin that causes botulism (a disease that causes paralysis). It is poisonous enough that 2 or 3 spoonfuls would kill 100 million people! </li></ul><ul><li>This toxin can be rendered harmless and used as botox!! </li></ul><ul><li>Reproduce by binary fission : cell division that produces identical daughter cells: </li></ul>
  12. 14. Bacteria <ul><li>Diseases Symptoms </li></ul><ul><li>- tuberculosis coughing up blood </li></ul><ul><li>- impetigo red patches on skin </li></ul><ul><li>- cholera fever, diarrhoea, thirst </li></ul>
  13. 19. VIRUSES <ul><li>Smallest known organisms </li></ul><ul><li>Can only multiply inside animal or plant cells </li></ul><ul><li>This makes it very hard to treat diseases caused by viruses </li></ul><ul><li>DISEASES: </li></ul><ul><li>HIV (leads to AIDS) </li></ul><ul><li>‘ flu </li></ul><ul><li>Chicken pox </li></ul><ul><li>Measles </li></ul><ul><li>Cold sores </li></ul><ul><li>- Ebola (very nasty disease; hard to treat) </li></ul>
  14. 21. Viruses <ul><li>Viruses latch on to a host cell using chemical hooks on their protein coat, and 'drill' through the host cell wall. Once inside, the viral DNA or RNA takes over the host cell's reproductive mechanism and makes hundreds of thousands of copies of itself. Eventually the virus- clones fill the whole host cell, and burst it open like the baby monsters in the Alien films. The viral offspring are then passed out in the blood stream, the airways or by other routes. </li></ul>
  15. 22. Viruses <ul><li>DISEASES: </li></ul><ul><li>HIV (leads to AIDS) </li></ul><ul><li>‘ flu </li></ul><ul><li>SARS </li></ul><ul><li>Measles </li></ul><ul><li>Cold sores </li></ul><ul><li>- Ebola (very nasty disease; hard to treat) </li></ul>
  16. 27. Cell wall Tail Slime layer DNA
  17. 29. Protein Coat DNA

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