(a)[2]
State two characteristics of animal cells that are not present in bacteria.
(b(i))[2]
Explain why a source of nitrogen and glucose were added to the fermenter.
(b(ii))[3]
Suggest why it is necessary to keep stirring the fermenter contents without interruption.
(c)[6]
Describe and explain how the number of live bacteria changes in the stages labelled A, B, C and D in Fig. 1.2.