Drug testing and antibiotics Quiz
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5 questions, one answer each
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1. Which is the purpose of a placebo group in a drug trial?
- A. To give a second drug
- B. To separate the effect of the drug from the effect of expectation
- C. To increase the number of side effects
- D. To test the highest safe dose
2. Which phase of a clinical trial uses healthy volunteers?
- A. Phase 3
- B. Phase 2
- C. Pre-clinical testing
- D. Phase 1
3. Why is a Petri dish incubated at 25 °C rather than 37 °C in school?
- A. Bacteria grow only at 25 °C
- B. Enzymes denature at 37 °C
- C. Human pathogens are less likely to grow well
- D. Agar melts at 37 °C
4. A clear zone around a garlic disc has a diameter of 16 mm. What is its area (to 3 s.f.)?
- A. 201 mm²
- B. 50.3 mm²
- C. 804 mm²
- D. 25.1 mm²
5. Why is a disc soaked in sterile water included on the plate?
- A. To act as a negative control
- B. To measure the antibiotic's strength
- C. To feed the bacteria
- D. To kill other microorganisms