(a)[1]
State the name of the type of organism that makes penicillin.
(b)[3]
Fig. 6.1 illustrates how the biomass of the penicillin-producing organism changes when it is cultured in a fermenter under controlled conditions. State the names of the growth phases of the organism indicated by X, Y and Z in Fig. 6.1. X Y Z
(c(i))[2]
Explain why air is pumped into the fermenter shown in Fig. 6.2.
(c(ii))[3]
Explain why the temperature in the fermenter has to be controlled.
(c(iii))[2]
State the function of the paddles in the fermenter.
(c(iv))[2]
Apart from penicillin, state the names of two commercial products that may be made using fermenters. 1 2