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TLS Online TPP Program

#Question id: 35935

Which of the following statements about microbial growth are correct?

#XL - U Food Technology
  1. During the log phase, microbial cells are metabolically inactive.
  2. The stationary phase in a batch culture is often due to nutrient depletion and/or accumulation of toxic products.
  3. Psychrophilic bacteria grow best at temperatures between 55–65°C.
  4. Generation time is the time required for a population to double in number.
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TLS Online TPP Program

#Question id: 35788

#XL - U Food Technology

The main purpose of performing a serial dilution in microbiology is to:
TLS Online TPP Program

#Question id: 35789

#XL - U Food Technology

In serial dilution, a 1 mL sample is added to 9 mL of diluent. What is the dilution factor?
TLS Online TPP Program

#Question id: 35790

#XL - U Food Technology

If a 10-5 dilution yields 150 colonies when 0.1 mL is plated, what is the original concentration (CFU/mL) of the sample?
TLS Online TPP Program

#Question id: 35791

#XL - U Food Technology

A 1 mL aliquot is serially diluted three times using a 1:10 dilution each time. What is the final dilution factor?
TLS Online TPP Program

#Question id: 35792

#XL - U Food Technology

You perform a serial dilution and plate 0.1 mL from the 10-4 dilution, obtaining 80 colonies. What is the CFU/mL in the original sample?
TLS Online TPP Program

#Question id: 35793

#XL - U Food Technology

Which of the following is a critical assumption when using the serial dilution and plate count method?