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211 What is the significance of a “negative” result in an MPN test?

A: No bacteria detected

B: Bacteria are present in high numbers

C: The sample is contaminated

D: Results are inconclusive

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212 What type of statistical analysis is used to interpret MPN test results?

A: Descriptive statistics

B: Inferential statistics

C: Poisson distribution

D: Chi-square test

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213 How is the MPN number usually expressed?

A: In colony-forming units per milliliter

B: As a percentage

C: As a ratio

D: In most probable number per 100 mL

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214 What does the MPN table help determine?

A: Type of bacteria present

B: Bacteria count estimate

C: Antibiotic resistance

D: Bacterial growth rate

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215 Which medium is commonly used in the MPN test?

A: Nutrient agar

B: EMB agar

C: Lauryl tryptose broth

D: MacConkey agar

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216 What does a positive MPN test result indicate?

A: No bacteria present

B: Low bacteria concentration

C: High bacteria concentration

D: Possible bacterial contamination

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217 What is the purpose of using different dilution levels in the MPN test?

A: To increase the sample size

B: To improve the accuracy of results

C: To test different types of bacteria

D: To estimate bacteria concentration

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218 Which type of sample is commonly used in the MPN test?

A: Solid food samples

B: Water samples

C: Air samples

D: Soil samples

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219 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

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220 What does the MPN test primarily measure?

A: Total coliform bacteria

B: E. coli presence

C: Fecal coliform bacteria

D: Yeast contamination

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