Fermentation Kinetics – Section 1

6. The function of a mechanical seal is to

A. prevent contaminants entering the reactor
B. prevent cells from leaving the reactor
C. both (a) and (b)
D. prevent air to enter

Correct Answer: C. both (a) and (b)

7. The phenomenon in which substrates are used in a sequential manner is known as

A. trans-substrate genesis
B. dualism
C. diauxie
D. multiplicity

Correct Answer: C. diauxie

8. The dilution rate, D is defined as(where F = volumetric flow rate, VR = total volume of culture in the reactor and μ specific growth rate)

A. F/VR
B. VR/F
C. μ/F
D. F/μ

Correct Answer: A. F/VR

9. Diauxie is

A. growth factors
B. microbiological die-off
C. the simultaneous uptake of nutrients
D. the stagewise uptake of nutrients

Correct Answer: D. the stagewise uptake of nutrients

10. An open system in which the growth rate is maintained by adding a nutrient (present in limiting quantities) at the same rate as that medium containing micro-organisms is removed is called

A. manostat
B. chemostat
C. turbidostat
D. culturostat

Correct Answer: B. chemostat

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