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TLS Online TPP Program

#Question id: 8692

Which of the following statements is accurate with regard to a phylogeny, as represented by a phylogenetic tree?

#XL - T Zoology
  1. Descendant groups (branches) from the same node likely share many derived characters.
  2. A monophyletic group can be properly based on convergent features.
  3. The ancestral group often has all the derived characters of the descendant species.
  4. Shared ancestral characters are excellent traits to use in developing a phylogeny.
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TLS Online TPP Program

#Question id: 34201

#XL - S Microbiology

In a chemostat, the dilution rate (D) is 0.5 h-1 and the specific growth rate (μ) of the organism equals the dilution rate. Calculate the residence time of the culture in minutes.
TLS Online TPP Program

#Question id: 34202

#XL - S Microbiology

If a culture starts with N0=2×106 cells and grows to N=1.6×107 cells, calculate the number of generations (n).
TLS Online TPP Program

#Question id: 34203

#XL - S Microbiology

For a bacterial species, the following parameters are known:
μmax=0.9 h−1
Ks=0.1 g/L
Substrate concentration S=0.1 g/L 
Calculate the specific growth rate μ.
TLS Online TPP Program

#Question id: 34204

#XL - S Microbiology

A bacterium has a 𝜇max​  of 1.2 h⁻¹ and exhibits a specific growth rate (𝜇) 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 (μmax) 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 𝜇max=1.0 h−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.