Cholesterol, bile acids, ergosterol, and stigmasterol share all the following common structural features except

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#Question id: 14360

#Section 5: Bioprocess Engineering and Process Biotechnology

1 pg of an enzyme (Mr 160 000) converts 0.192 pmol/min. This enzyme is made up of four subunits. Calculate turnover number 

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#Question id: 15585

#Section 4: Fundamentals of Biological Engineering

A stirrer has a power number (Np) 10. If the stirrer speed (N) is 1 s^-1 , its diameter D= 1 m and the density of the medium is 1000 kg/m3, the ungassed power input (P) in watts is

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#Question id: 14237

#Section 5: Bioprocess Engineering and Process Biotechnology

A genetically-engineered strain of yeast is cultured in a bioreactor at 30⁰C for production of heterologous protein. The oxygen requirement is 80 mmol 1-1 h-I; the critical oxygen concentration is 0.004 mM. The solubility of oxygen in the fermentation broth is estimated to be 10% lower than in water due to solute effects. What is the minimum mass-transfer coefficient necessary to sustain this culture if the reactor is sparged with air at approximately 1 atm pressure ?         

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#Question id: 15470

#Section 4: Fundamentals of Biological Engineering

In the stoichiometric equation given below identify which one of the following corresponds to oxygen balance:

CwHxOyNz + aO2 + bHgOhNi cCHαO_βN_δ + dCO₂ + eH₂O

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#Question id: 3002

#Section 2: General Biology

Cells are most sensitive to penicillin during which phase of the growth curve?