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Megan Nolan




Triple Biology Revision Notes:
Microbes

Microbes include bacteria, viruses and fungi.

Bacteria:

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…

Page 2

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Megan Nolan




Louis Pasteur
and his swan
necked flasks:

Before Louis
Pasteur's
discovery,
spontaneous
generation- an
idea proposed
by Aristotle- was
widely
believed.

Spontaneous
generation is
when complex
life forms arise
spontaneously
from
inanimate
objects.

Louis
Pasteur set up
two swan
necked flasks
containing
nutrient broth
and boiled
them to…

Page 3

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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…

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