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TLS Online TPP Program

#Question id: 4949

What probably accounts for the switch to DNA-based genetic systems during the evolution of life on Earth?

#XL - T Zoology

  1. DNA is chemically more stable and replicates with fewer errors (mutations) than RNA.

  2. Only DNA can replicate during cell division.

  3. RNA is too involved with translation of proteins and cannot provide multiple functions.

  4. DNA forms the rod-shaped chromosomes necessary for cell division.

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TLS Online TPP Program

#Question id: 34204

#XL - S Microbiology

A bacterium has a πœ‡max​  of 1.2 h⁻¹ and exhibits a specific growth rate (πœ‡) of 0.8 h⁻¹ when the substrate concentration 𝑆 is 0.4 g/L. Calculate the value of 𝐾𝑠​ .
TLS Online TPP Program

#Question id: 34205

#XL - S Microbiology

A continuous culture is maintained under steady-state conditions in a chemostat where the dilution rate equals the specific growth rate. If the maximum specific growth rate (ΞΌmax) of the organism is 0.8 h-1 and the substrate concentration at which the organism grows at this rate is 1.6 g/L, determine the substrate concentration (in g/L) at which the specific growth rate becomes 0.4 h-1. Assume Monod kinetics apply and Ks=0.4 g/L.
TLS Online TPP Program

#Question id: 34206

#XL - S Microbiology

In a chemostat experiment, a microbial species with πœ‡max=1.0 hβˆ’1  and 𝐾𝑠=0.2 g/L is maintained at steady-state. If the dilution rate is set to 0.5 h-1, calculate the substrate concentration (S) in the reactor (in g/L), assuming Monod growth.
TLS Online TPP Program

#Question id: 34325

#XL - S Microbiology

Which of the following statements regarding moist heat sterilization are correct?
TLS Online TPP Program

#Question id: 34326

#XL - S Microbiology

Which of the following chemical agents act by disrupting microbial membranes?
TLS Online TPP Program

#Question id: 34327

#XL - S Microbiology

Which of the following can be used as indicators for successful sterilization?