Mastering Microbial Control
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Questions and Answers

What does the thermal death point (TDP) of a microorganism refer to?

  • The temperature at which a microorganism multiplies fastest
  • The lowest temperature at which all microbes are killed in a 10-minute exposure (correct)
  • The highest temperature a microorganism can survive
  • The temperature at which a microorganism becomes dormant
  • Why is boiling less effective at killing endospores?

  • Endospores can survive up to boiling temperatures (correct)
  • Endospores require a higher temperature to denature proteins
  • Endospores are immune to heat
  • Boiling increases the reproduction rate of endospores
  • What is the purpose of the thermal death time (TDT)?

  • To measure the time it takes for a microorganism to multiply at a given temperature
  • To determine the length of time needed to kill all microorganisms in a sample at a given temperature (correct)
  • To establish the time it takes for a microorganism to become dormant at a certain temperature
  • To calculate the time it takes for a microorganism to adapt to a new temperature
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