- A) To inhibit the growth of unwanted bacteria
- B) To enhance bacterial growth
- C) To test for antibiotic resistance
- D) To measure bacterial size
Microbiology MCQ
Total MCQ:
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MCQ Quiz on Microbiology
12 Why are multiple tubes used in the MPN test?
- A) To increase sample size
- B) To ensure accurate results
- C) To account for variability and improve accuracy
- D) To decrease analysis time
13 What does a high MPN value typically indicate?
- A) Low contamination
- B) High contamination
- C) No contamination
- D) Uncertain contamination level
14 What is the standard dilution factor used in the MPN test?
- A) 1:10
- B) 2:40
- C) 17:40
- D) 167:40:00
15 Which of the following is a limitation of the MPN test?
- A) Provides exact bacterial counts
- B) Time-consuming
- C) Requires sophisticated equipment
- D) Cannot be used for large volumes
16 In the MPN test, what does the term “confirmation test” refer to?
- A) A second MPN test on the same sample
- B) A test to confirm the presence of a specific bacterial type
- C) A test to confirm the sample's volume
- D) A retest for accuracy in different conditions
17 In the MPN test, what does the term “most probable number” refer to?
- A) The highest number of bacteria detected
- B) The most accurate count of bacteria
- C) An estimate of bacteria concentration
- D) The minimum bacteria concentration
18 How does the MPN test differ from the plate count method?
- A) MPN provides a direct count, while plate count estimates
- B) MPN estimates bacterial numbers, while plate count provides direct counts
- C) MPN uses statistical analysis, while plate count does not
- D) MPN is faster than plate count method
19 Which type of sample is commonly used in the MPN test?
- A) Solid food samples
- B) Water samples
- C) Air samples
- D) Soil samples
20 What kind of growth pattern is observed in the MPN test tubes?
- A) Uniform growth across all tubes
- B) No growth in any tubes
- C) Variable growth depending on dilution
- D) Growth only in control tubes