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Micro-organisms Melany, Diana y Natalia

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Sección Bilingüe MRZ

on 26 February 2013

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Transcript of Micro-organisms Melany, Diana y Natalia

What are micro-organisms?
Micro-organisms are very small living things. Micro-organisms Harmful micro-organisms Types of
micro-organisms Structure, habitat and food
of micro-organisms Helpful micro-organisms Fermentation is a way of preserving food.
Milk goes bad quickly, but we can preserve it by making yoghurt and cheese. We use a process called fermentation to make yoghurt and cheese. In this process bacteria change the carbohydrates in the milk into acid. The acid stops other micro-organisms growing in the food. Fermentation Bacteria:
A sore throat: You can get a high temperature.
Food poisoning: Some bacteria release toxins into food.
Tooth decay: Bacteria in your mouth ferment the sugars in your food.

Fungi:
Athlete´s foot: It makes your feet red and itchy.
Mould: It makes food go bad.

Viruses:
Chickenpox: You get a high temperature and itchy spots.
A cold: You get a cough, a sore throat and a runny nose.
Flu: You get a high temperature and your muscles hurt. You also feel very tired. Micro-organisms with
one cell are unicellular. Micro-organisms with
several cells are multicellular. Parts of a cell The cell membrane surrounds the cell and gives it shape.
The cytoplasm is a thick liquid inside the cell membrane.
The nucleus is inside the cytoplasm. It controls the cell.
Plant cells also have a cell wall outside the cell membrane. Hygiene rules Animal cell Plant cell We use bacteria
and fungi to make
antibiotics.
Antibiotics can
cure some illnesses. Algae produce about
75% of the oxygen we
breathe.
They absorb a lot of
carbon dioxide too. Yeast is a type of fungi.
We use yeast to make bread. We have bacteria
in our digestive system.
They help us to digest
our food.
They help to produce
some vitamins too. Bacteria and fungi
break down dead
plants and animals to
make organic material.
This is important for
new plants to grow. We use bacteria
to make products
from milk, like
yoghurt and cheese. You shouldn´t
touch food with
dirty hands. You shouldn´t
and eat at the
same time. You shouldn´t
put food like
meat and fish in
the fridge. You should
clean and cover
cuts. You shouldn´t
sneeze on food
or other people. You should
clean your teeth
after meals.
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