WJEC GCSE Biology 3 Microbes


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  • Created on: 22-05-12 17:16
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Megan Nolan
Triple Biology Revision Notes:
Microbes include bacteria, viruses and fungi.
Bigger than viruses, but smaller than yeast
(a fungi)
Have no distinct nucleus, but a nucleoid
containing free floating DNA
Have a flagellum to aid movement
Capsule (only on some bacteria)- helps it
to bind and has a protective function
Reproduces a-sexually by dividing in two
Smaller than bacteria and fungi
Consists of a protein coat surrounding genetic information (DNA or RNA)
Not classed as living
No cell membrane/ cell wall/ cytoplasm
Can only reproduce when inside a host cell. The production of new viruses
results in the destruction of the host cell and the release of new viruses.
Yeast is a type of fungi
It is bigger than either bacteria or viruses
Cells contain a nucleus, a cell wall, a cell membrane and cytoplasm
Reproduce a-sexually by budding
Aseptic techniques:

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Megan Nolan
Louis Pasteur
and his swan
necked flasks:
Before Louis
generation- an
idea proposed
by Aristotle- was
generation is
when complex
life forms arise
objects.…read more

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Megan Nolan
broke off the neck to allow air to reach the broth, he left the neck on the second flask to
ensure no air could reach it
Louis Pasteur observed dust falling into the first flask, and microbes growing from this dust
No dust entered the second flask, and therefore no microbes could grow
He proved the role of these microbes as the source of food spoilage…read more


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