Biochemical Engineering - Fermentation Reactors

Exercise : Fermentation Reactors - Section 1
11.
Which of the statement is true for continuous reactor at steady state?
The rates of biomass, substrate and product concentrations are zero
Biomass, substrate and product concentrations are zero
Biomass, substrate and product concentrations do not change with time
Biomass, substrate and product concentrations change with time
Answer: Option
Explanation:
No answer description is available. Let's discuss.

12.
A continuous bioreactor in which only the flow rate is used to control the rate of cell or product productivity is called
turbidostat
chemostat
level stat
pH
Answer: Option
Explanation:
No answer description is available. Let's discuss.

13.
For organisms growing in a chemostat, the specific growth rate
cannot be determined
can be determined from the dilution rate
equals to the maximum specific growth rate of the culture
none of the above
Answer: Option
Explanation:
No answer description is available. Let's discuss.

14.
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
decrease with time
increase with time
be constant
change randomly with time
Answer: Option
Explanation:
No answer description is available. Let's discuss.

15.
In aerobic yeast fermentation for production of citric acid from alkanes using a fed-batch culture, why alkanes are slowly fed to the yeast?
Citric acid is toxic to the cells
Alkanes cause foaming
Fast addition of alkanes will inhibit the cells and reduce oxygen transfer rates
Fast addition of alkanes will cause the cells to grow too quickly
Answer: Option
Explanation:
No answer description is available. Let's discuss.