Microbial techniques and culturing Quiz
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5 questions, one answer each
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1. Which phase has the fastest rate of increase in cell number?
- A. Lag
- B. Log
- C. Stationary
- D. Death
2. What is the purpose of a selective medium?
- A. To supply all nutrients
- B. To allow only certain microorganisms to grow
- C. To kill all bacteria
- D. To turn the culture clear
3. 46 colonies grew from 0.1 cm³ of a 10⁻³ dilution. How many viable cells per cm³ were in the original culture?
- A. 4.6 × 10²
- B. 4.6 × 10⁴
- C. 4.6 × 10⁶
- D. 4.6 × 10⁵
4. Why is the loop flamed between streaks in streak plating?
- A. To warm the agar
- B. To keep it moist
- C. To kill bacteria so that the cells are progressively diluted
- D. To remove the agar
5. A culture grows from 1.0 × 10³ to 1.0 × 10⁷ cells. How many generations occurred? (log₁₀ 2 = 0.301)
- A. 13.3
- B. 10.0
- C. 4.0
- D. 26.6