Enzyme induction in bacterial systems has been studied intensively (F. Jacob 1966, J. Monod 1966). Comparative studies have also been made in the late stage of development in Neurospora crassa. In this thesis, the induction of aryl-beta-glucosidase and cellobiase in Neurospora has been studied in the early stages of development. A mutant strain of Neurospora characterized by its low level of aryl-beta-glucosidase was used as well as wild type in an attempt to learn the function of the gluc-l locus. In addition, the endogenous induction--an increase in enzyme activities during the process of differentiation--was studied. A comparison between endogenous induction and exogenous induction caused by external effectors has been discussed
