This document provides information about microorganisms including bacteria, viruses, and fungi. It defines microorganisms as very small living things and notes that bacteria are single-celled organisms that can be beneficial or pathogenic. Viruses are described as non-living microbes that need a host cell to reproduce. Examples of bacteria, viruses, and fungi are presented along with illustrations of their structures and life cycles. The document also discusses how microorganisms can cause both beneficial and pathogenic effects.

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

3. Micro-Micro-
organismsorganisms
Micro-organisms
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 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. Structure of
bacteria
Flagellum (Tail for movement)
Cell wall
Cell
membrane Slimy capsule
Strand
of DNA
Cytoplasm

6. Bacteria can double in number
every 20 minutes!

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

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


10. 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!
Methicillin Resistant
Staphylococcus aureus
Methicillin
(an
antibiotic)
WON’T
Work to
cure this
infection!


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

14. Structure of
viruses

15. How viruses
replicate inside
cells

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

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
To this
From this

22. Treatment of
viral infections


23. 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.
Why did the mushroom want
to go out with the toadstool?
Because he was a Fungi to be
with!


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

25. Mould and fungus causesMould and fungus causes
things to breakdownthings to breakdown

26. Fungus
taking
over

27. Athletes
foot

28. Oral thrushOral thrush
Thrush yeast
cells

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

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

31. How well do
you wash your
hands?