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Starter (complete questions in book) What is an antibiotic? PowerPoint Presentation
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Starter (complete questions in book) What is an antibiotic? - PowerPoint PPT Presentation


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1. How can we grow bacteria?. Growing and Investigating Bacteria. Starter (complete questions in book) What is an antibiotic? Why do they only target bacteria but not viruses? How were antibiotics first discovered?. 2. Why do we need uncontaminated cultures?.

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Starter (complete questions in book) What is an antibiotic?


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    1. 1. How can we grow bacteria? Growing and Investigating Bacteria Starter (complete questions in book) • What is an antibiotic? • Why do they only target bacteria but not viruses? • How were antibiotics first discovered? 2. Why do we need uncontaminated cultures? 3. Why do we incubate bacteria at 25 degrees celcius?

    2. 1. How can we grow bacteria? Growing and Investigating Bacteria Key Words • Culture medium, Agar, Antibiotics, Mutation, Pathogen, Sterilise, Petri dish, Innoculate. 2. Why do we need uncontaminated cultures? 3. Why do we incubate bacteria at 25 degrees celcius?

    3. 1. How can we grow bacteria? Growing and Investigating Bacteria Key Points • An uncontaminated culture of microorganisms can be grown using sterilised petri dishes and agar. • You sterilise the inoculating loop before use and seal the dish to prevent unwanted microorganisms getting in. • The culture is left for 25 degrees celcius for a few days. 2. Why do we need uncontaminated cultures? 3. Why do we incubate bacteria at 25 degrees celcius?

    4. 1. How can we grow bacteria? Growing and Investigating Bacteria Questions • What is the agar jelly used for? (1) • What precautions do you take to avoid contamination? (2) • Why is contamination an issue when examining the effects of an antibiotic? (2) • Why is the petri dish incubated at 25 degrees celclius? (2) 2. Why do we need uncontaminated cultures? 3. Why do we incubate bacteria at 25 degrees celcius?

    5. 1. What is antibiotic resistance? Changing Pathogens Key Points • Many bacterium have developed antibiotic resistance due to natural selection. 2. Why is mutation an issue?

    6. 1. What is antibiotic resistance? Changing Pathogens 2. Why is mutation an issue? Key Points A mutation results in antibiotic resistance, this bacteria survives and replicates, passing on the gene. Key Points

    7. 1. What is antibiotic resistance? Changing Pathogens Key Points • If bacteria or viruses mutate, new strains of the pathogen can appear causing disease. 2. Why is mutation an issue?

    8. 1. What is antibiotic resistance? Changing Pathogens 2. Why is mutation an issue? Key Points Epidemic happens in one country. Pandemic happens in several countries. Key Points

    9. 1. What is antibiotic resistance? Changing Pathogens 2. Why is mutation an issue? Questions Describe how a bacteria becomes resistant to antibiotics. Was swine Flu a pandemic or epidemic? Explain how swine flu killed so many people, despite many being vaccinated against influenza (flu). Key Points