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
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
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
9. Diauxie is
A. growth factors
B. microbiological die-off
C. the simultaneous uptake of nutrients
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