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TLS Online TPP Program

#Question id: 181

Titration of valine by a strong base, for example NaOH, reveals two pK’s. The titration reaction occurring at pK2 (pK2 = 9.62) is:

#XL - T Zoology

  1. —COOH + OH-  -> —COO- + H2O.

  2. —COOH + —NH2 -> —COO- + —NH2+.

  3.  —COO- + —NH2+ -> —COOH + —NH2.

  4. —NH3+ + OH-  -> —NH2 + H2O.

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TLS Online TPP Program

#Question id: 34346

#XL - S Microbiology

Which of the following statements are true regarding D-value (Decimal Reduction Time)?
TLS Online TPP Program

#Question id: 34347

#XL - S Microbiology

Which of the following are true about the Z-value?
TLS Online TPP Program

#Question id: 34348

#XL - S Microbiology

Which of the following correctly distinguish Thermal Death Point (TDP) and Thermal Death Time (TDT)?
TLS Online TPP Program

#Question id: 34349

#XL - S Microbiology

Which of the following plots can be used to determine TDT and Z-value?
TLS Online TPP Program

#Question id: 34350

#XL - S Microbiology

Which of the following conclusions can be drawn if TDT decreases as temperature increases?
TLS Online TPP Program

#Question id: 34351

#XL - S Microbiology

A microbial population is reduced from 1 × 106 CFU/mL to 1 × 103 CFU/mL after 9 minutes at 121°C. Assume first-order kinetics. What is the D-value (in minutes) at 121°C?