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TLS Online TPP Program

#Question id: 19538

The equation for aerobic production of acetic acid from ethanol is ____________
C2H5OH(ethanol) + O2(acetic acid) → CH3CO2H + H2O
Acetobacter aceti bacteria are added to vigorously-aerated medium containing 10 g l-1 ethanol. After some time, the ethanol concentration is 2 g l-1 and 7.5 g l-1  acetic acid is produced. Calculate the theoretical yield.

#Section 4: Fundamentals of Biological Engineering
  1. 1.20 g g-1
  2. 1.10 g g-1
  3. 1.30 g g-1
  4. 1.40 g g-1
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TLS Online TPP Program

#Question id: 371

#Section 4: Fundamentals of Biological Engineering

How many milliliters of a 2.0 M solution of boric acid must be added to 600 mL of a solution of 10 mM sodium borate in order for the pH to be 9.45? (pKa of boric acid = 9.24)
TLS Online TPP Program

#Question id: 15497

#Section 4: Fundamentals of Biological Engineering

A. aceti converts alcohol to acetic acid according to the stoichiometric relation

C2H5OH + O2 🡪CH3COOH + H2O

In a vigorously agitated and aerated reactor containing 20 g/l ethanol, the organism produces 16 g/l acetic acid and 2 g/l was the residual ethanol concentration. What are the theoretical and observed yields of acetic acid expressed in g/g ethanol?
TLS Online TPP Program

#Question id: 14420

#Section 1: Engineering Mathematics

Solve the following system of equations x — y + z = 4, x — 2y + 2z = 9 and 2x + y + 3z = 1. 
TLS Online TPP Program

#Question id: 14165

#Section 5: Bioprocess Engineering and Process Biotechnology

Stoichiometric equations are used to represent growth of microorganisms provided a ' molecular formula' for the cells is available. The molecular formula for biomass is obtained by measuring the amounts of C, N, H, O and other elements in cells. For a particular bacterial strain, the molecular formula was determined to be C4.4H7.30 1.2N0.86 . These bacteria are grown under aerobic conditions with hexadecane (C16H34) as substrate. The reaction equation describing growth is:

                                    

Assuming 100% conversion, what is the yield of cells from oxygen in g g-l?
TLS Online TPP Program

#Question id: 420

#Section 4: Fundamentals of Biological Engineering

The structure of NAD+ does not include: