The following are certain statements about secondary metabolites:

a) They protect plants against being eaten by herbivores and against being infected by microbial pathogens

b) Terpenes, are the class of secondary metabolites are synthesized by methyl erythritol phosphate(MEP) pathway and Mevalonic acid pathway

c) Terpenes, are the class of secondary metabolites are synthesized by methyl erythritol phosphate(MEP) pathway and sikkimic acid pathway

Which one of the following combinations of the above statements is correct?

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#Question id: 27175

#Section 5: Bioprocess Engineering and Process Biotechnology

A bacterial culture having a specific oxygen uptake rate of 5 mmol O2 (g- DCW)^-1h-1 is being grown aerobically in a fed-batch reactor. The maximum value of the volumetric oxygen transfer coefficient is 0.18 s for the stirred tank bioreactor and the critical dissolved oxygen concentration is 20% of the saturation concentration (8 mg L^-1). The maximum density to which the cells can be grown in the fed-batch process, without the growth being limited by oxygen transfer, is approximately

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#Question id: 27176

#Section 5: Bioprocess Engineering and Process Biotechnology

A strain of Azotobacter vinelandii is cultured in a 15-m³ stirred fermenter for alginate production. Under current operating conditions, ka is 0.17 s¹. The solubility of oxygen in the broth is approximately 8 × 10^-3 kg m ^-3.

(a) The specific rate of oxygen uptake is 12.5 mmol g^-1h^-1. What is the maximum cell concentration supported by oxygen transfer in the fermenter.............in g/l

TLS Online TPP Program

#Question id: 27177

#Section 5: Bioprocess Engineering and Process Biotechnology

A strain of Azotobacter vinelandii is cultured in a 15-m³ stirred fermenter for alginate produc- tion. Under current operating conditions, k_La is 0.17 s^-1. The solubility of oxygen in the broth is approximately 8 × 10^-3 kg m^-3.

(b) The bacteria suffer growth inhibition after copper sulphate is accidentally added to the fermentation broth just after the start of the culture. This causes a reduction in the oxygen uptake rate to 3 mmol g^-1 h^-1. What maximum cell concentration can now be supported by oxygen transfer in the fermenter?.....g/l

TLS Online TPP Program

#Question id: 27183

#Section 5: Bioprocess Engineering and Process Biotechnology

Calculate the overall order of a reaction which has rate expression:

Rate = k [A]^1/2 [B]^3/2

TLS Online TPP Program

#Question id: 27184

#Section 5: Bioprocess Engineering and Process Biotechnology

The rate constant of a reaction is k=3.28×10^-4 s^-1. Find the order of the reaction.