26. The maximum specific growth rate (μ_m) of an organism in batch culture is equal to slope of a plot of

A. In [biomass] against time for exponential phase data only
B. In [biomass] against time
C. biomass against time
D. biomass against time for stationary phase data only

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27. The region of an airlift bioreactor in which the liquid travels in a downward direction is called the

A. downcomer
B. disengagement zone
C. air riser
D. flotsam

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28. Population doubling time, t_d can be expressed as (where μ is the specific growth rate.)

A. log2/μ
B. ln2/μ
C. μ/ln2
D. μ/log2

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29. A higher K_s value of Monod’s equation means

A. greater affinities to substrate
B. lower affinities to substrate
C. unaffected with the substrate bonding
D. lower dissociation constant value

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30. The increased airflow rate in bubble column fermenter can cause excessive foaming and high retention of air bubbles in the column which

A. decreases the productivity of the fermenter
B. increases the productivity of the fermenter
C. modestly increases the productivity of the fermenter
D. does not affect on the productivity

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