logo

CuriousTab

CuriousTab

Discussion


Home Biochemical Engineering Fermentation Reactors See What Others Are Saying!
  • Question
  • Saccharomyces cerevisiae is being grown in a chemostat converts glucose to biomass, ethanol, glycerol and carbon dioxide. At steady state, the concentration of glucose, biomass, ethanol and glycerol will


  • Options
  • A. decrease with time
  • B. increase with time
  • C. be constant
  • D. change randomly with time

  • Correct Answer
  • be constant 


  • More questions

    • 1. Which of the following is considered as a disadvantage to the adsorption method of immobilization?

    • Options
    • A. It is possible to separate and purify the enzymes while being immobilized
    • B. The enzymes are not usually deactivated by adsorption
    • C. The adsorption is a reversible process
    • D. State of immobilization is very sensitive to solution pH, ionic strength and temperature
    • Discuss
    • 2. Which of the following statements is not true?

    • Options
    • A. Enzymes are proteins that bind to specific substrates and increase the velocity of reactions involving those substrates
    • B. Enzymes function by overcoming the activation energy barrier of a reaction
    • C. Enzymes make thermodynamically favorable reactions to proceed; they cannot make unfavorable reactions to occur
    • D. Enzymes only function when they are in intact cells
    • Discuss
    • 3. A viscoelastic fluid is one in which the viscosity

    • Options
    • A. is constant regardless of the stirrer speed or mixing time
    • B. changes during mixing but returns to its original state after mixing
    • C. increases with increasing stirrer speed
    • D. decreases with increasing stirrer speed
    • Discuss
    • 4. An allosteric inhibitor of an enzyme usually

    • Options
    • A. participates in feedback regulation
    • B. denatures the enzyme
    • C. is a hydrophobic compound
    • D. causes the enzyme to work faster
    • Discuss
    • 5. Juice clarification extraction is facilitated by using

    • Options
    • A. cellulases
    • B. amylase
    • C. inulinase
    • D. lactase
    • Discuss
    • 6. Chemostats work on the principle of

    • Options
    • A. maintaining constant volume of culture medium
    • B. maintaining continuous flow of nutrients
    • C. maintaining uniform nutrients concentration
    • D. operating at higher pressure
    • Discuss
    • 7. In a plug flow reactor, the highest concentration of substrates is exposed to the cells that

    • Options
    • A. are near the effluent or exit of the reactor
    • B. are in the mid way along the reactor
    • C. are located near entrance of feed
    • D. are near the wall of the reactor
    • Discuss
    • 8. The continuous cultures are not widely used in industry because

    • Options
    • A. they are not suited for the production of secondary metabolites
    • B. contamination or mutation can have a disastrous effect on the operation
    • C. the government will not approve the licensing of pharmaceuticals produced in continuous cultures
    • D. all of the above
    • Discuss
    • 9. Transient flow range of mixing speed is obtained for

    • Options
    • A. Rei<10
    • B. 10<Rei<104
    • C. Rei&gt104
    • D. None of these
    • Discuss
    • 10. Henry's law relates

    • Options
    • A. the partial pressure of oxygen and the saturation concentration of oxygen in the liquid
    • B. the oxygen transfer rate and the bubble size
    • C. the oxygen transfer rate and the temperature
    • D. the oxygen transfer rate to the partial pressure of oxygen in the liquid
    • Discuss


    Comments

    There are no comments.

Enter a new Comment