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TLS Online TPP Program

#Question id: 35998

Which of the following statements are correct?

#XL - U Food Technology
  1. D-value is the time required at a specific temperature to reduce microbial count by 90%.
  2. Z-value is the temperature change required to change the D-value by a factor of 100.
  3. F-value is the total lethal effect of a thermal process expressed in minutes at a reference temperature.
  4. Commercial sterility usually corresponds to a 12-D reduction of Clostridium botulinum spores.
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TLS Online TPP Program

#Question id: 4957

#XL - T Zoology

How many half-lives should have elapsed if 6.25% of the parent isotope remains in a fossil at the time of analysis?
TLS Online TPP Program

#Question id: 4958

#XL - S Microbiology

What is true of the fossil record of mammalian origins?
TLS Online TPP Program

#Question id: 4958

#XL - T Zoology

What is true of the fossil record of mammalian origins?
TLS Online TPP Program

#Question id: 4959

#XL - S Microbiology

If a fossil is encased in a stratum of sedimentary rock without any strata of igneous rock (e.g., lava, volcanic ash) nearby, then it should be
TLS Online TPP Program

#Question id: 4961

#XL - S Microbiology

An early consequence of the release of oxygen gas by plant and bacterial photosynthesis was to
TLS Online TPP Program

#Question id: 4963

#XL - S Microbiology

Which free-living cells were the earliest contributors to the formation of Earthʹs oxidizing atmosphere?