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9 Cards in this Set
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What is the process of a white blood cell ingesting & destroying pathogens?
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Some WBCs ingest the pathogen. Once the pathogen is inside the cell, the WBC releases enzymes to digest and destroy it.
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What do antibodies do?
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Some WBCs release antibodies which are made to fit a specific pathogen. The antibodies attack the viruses and kill them.
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What do antibiotics do?
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They kill bacteria that get inside your body.
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Why can't antibiotics kill viruses?
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Because viruses live and reproduce inside body cells, it's difficult to develop medicines that kill viruses without damaging body cells and tissues.
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What is the process of immunisation (vaccination)?
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1. Weak/Inactive microbes are injected into the body.
2. Antibodies are produced which destroy the microbes and their toxins. 3. WBC can quickly produce antibodies if this pathogen enters the body again. |
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What is a mutation?
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A bacterium that is slightly different to others.
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What is natural selection?
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Non-resistant bacteria are killed, but a small number of resistant bacteria remain. They survive and reproduce. Continued use of the antibiotic causes the number of resistant bacteria to increase. This is an example of Natural Selection.
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How do you sterilise an inoculating loops?
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Pass it through a hot flame.
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How can you make sure that unwanted cultures don't enter the petri dish?
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1. Keeping the flame with an upward draught.
2. Only slightly opening the petri dish lid when needing to. 3. Seal the petri dish with adhesive tape once finished with. |
