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pathogens

Biology

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6 Terms

1
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micro-organism

a very small living organism which cannot be seen with the nake eye

not all micro-organisms are harmful

<p>a very small living organism which cannot be seen with the nake eye</p><p>not all micro-organisms are harmful</p>
2
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pathogen

a disease causing micro-organism

examples include:bacteria, viruses, fungi, protisis

<p>a disease causing micro-organism</p><p>examples include:bacteria, viruses, fungi, protisis</p>
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pathogens are spread by…

Air, Direct Contact, Animals+Insects (Vectors), Water, Formites, Lifestyle factors (etc hygiene)

4
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Spread of pathogens prevented by…

-hyginene (hand washing etc)

-isolating people with the disease

-destroying animals that carry and spread the disease

-vaccination

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<p>Binary Fission </p>

Binary Fission

Bacteria reproduce by simple binary fission - splits cell into 2 identical daughter cells

  • can divide up to every 20 mins in right conditions

  • growth rate impacted by: temperature, nutrients, oxgyen levels, pH

6
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<p>steps to binary fission</p>

steps to binary fission

  • DNA replication

  • Elongation of cell

  • DNA moves to opposite ends of the cell

  • septum/ cell membrane formation in the middle

  • Splits into two daughter cells.

<ul><li><p>DNA replication</p></li><li><p>Elongation of cell</p></li><li><p>DNA moves to opposite ends of the cell</p></li><li><p>septum/ cell membrane formation in the middle </p></li><li><p>Splits into two daughter cells.</p></li></ul>

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