37 marks – 1 hour
Questions.
Question 1.
i) Evaluate Pasteur’s contribution to our modern understanding of infectious diseases. [6 marks]
ii) Evaluate Koch’s contribution to our modern understanding of infectious diseases. [6 marks]
Question 2.
i) How would you increase the validity of the model used in class to demonstrate the findings of Pasteur? [3 marks]
ii) How would you increase the reliability of the model used in class to demonstrate the findings of Pasteur? [3 marks]
Question 3.
Explain why the reaction rate of the immune response is typically greater for someone who is exposed to a pathogen for the second time. [3 marks]
Question 4.
What aseptic techniques were required/ used for the testing of water for pathogens practical? [2 marks]
Question 5.
Outline some of the limitations of modelling Pasteur’s experiment. [2 marks]
Question 6.
Explain briefly the three layers of defence the human body has against pathogens. [3 marks]
Question 7.
Explain what the key concern would be for microbiologists who have sterilized sewage water to be consumed by the people living in the city. [2 marks]
Question 8.
Explain why molecular biology questions typically have, making reference to the water microbe testing practical:
- A control [2 mark]
- Controlled variables [1 mark]
- Independent variables [2 mark]
- Dependent variables [2 mark]
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