2.  Micro-organisms The word MICRO means very small. (So you need a
Microscope to see
it!)
Micro-organism Man! 

3. Micro-organisms  Micro-organisms So Micro-organisms are very
Micro- very small
Organism- a living thing.
So Micro-organisms are very
small living things!
N.B Viruses are often classed as micro-
organisms but technically they are NON-Living
so call them Microbes instead!
Micro-
organism
man 

4. Bacteria The good the bad and the ugly!
Bacteria The good the bad and the ugly!
Bacteria are small living single celled
organisms that can come in good
(beneficial) forms and bad (pathogenic)
forms that cause disease.
Some different shapes of bacteria

5. Flagellum (Tail for movement)
Structure of bacteria
Cytoplasm
Flagellum (Tail for movement)
Strand of DNA
Cell wall
Cell membrane
Slimy capsule

6. Bacteria can double in number every 20 minutes!

7. The motility (movement) of some bacteria in culture.
How fast!  
Pseudomonas aeruginosa  

8. During this lesson we are going to grow some of the bacteria that are found in this room on a petri dish ……. (exciting stuff huh!)

9.  Good bacteria Did you know Farts are made from
methane gas which is produced by
the bacteria in your gut?

10. Bacteria help to break down faeces (poo) in sewage works.
Good bacteria
Bacteria help to
break down
faeces (poo) in
sewage works.

11. Bad bacteria in the mouth cause teeth to rot.
Mouth bacteria
Mouth bacterium

12. MRSA- the bacterial superbug
MRSA- the bacterial superbug! Methicillin Resistant Staphylococcus aureus
Methicillin
(an
antibiotic)
WON’T
Work to
cure this
infection! 

13. Viruses  Viruses are extremely small (much smaller than bacteria)
It’s not popcorn! It’s a picture of a virus!
Viruses
Viruses are extremely small
(much smaller than bacteria)
NON-LIVING microbes that need
a host cell so that they can
reproduce and survive.
NON-LIVING
because they
do not fulfil all of the
MRS GREN criteria. 

14. Structure of viruses

15. How viruses replicate inside cells

16. Examples of viruses
The HIV virus. This attacks T4 lymphocytes. It is responsible for AIDS.
A T4 bacteriophage. This infects only bacterial cells, in this case only E. coli

17. One sneeze can transmit many cold virus particles

18. Bird flu virus 

19. Measles virus Electron microscope picture of the measles virus
Boy with measles

20. Viruses cause cold sores, warts and verucae

21. Foot and mouth disease is caused by a virus and is VERY infectious for cows
From this
To this

22. Treatment of viral infections

23. Fungi  Fungi are organisms that produce spores
Why did the mushroom want
to go out with the toadstool?
Because he was a Fungi to be
with!
Fungi
Fungi are organisms that produce spores
and come in the form of moulds, yeasts,
mushrooms and toadstools.
They also help things to rot and breakdown
which is an essential process in the cycle of life. 

24. Examples of fungi Mould growing a bread bun Yeast cells budding
There can be good forms of
fungus (used to make
bread/beer) and bad forms
(Mould, Athletes foot and thrush).
Yeast cells budding

25. Mould and fungus causes things to breakdown

26. Fungus taking over

27. Athletes foot

28. Oral thrush
Thrush yeast cells

29. (So a pathogen is the scientific name for a germ!)
A Pathogen is something that causes disease 
(So a pathogen is the scientific name for a germ!)

30. Some micro-organisms are VERY pathogenic and DANGEROUS
So you have to be super careful!

31. How well do you wash your hands?