Yeasts grown in anaerobic liquid media produced catalase in response to the presence of H,O s in the growth medium. The fact that some of the induced enzyme was active at the cell surface, bound either to the cell wall or cell-surface membrane, eliminated the need to crush cells in order to release the enzyme complement. Instead, catalase production was moni tored by using H,0,-reagent strips to detect changes in the level of H a O, in the growth medium. In addi tion, catalase induction in yeasts was found to be temperature-sensitive.It is suggested that biology teachers in schools might find the following experiments useful for demonstrat ing essential features of substrate-induced enzyme synthesis, based on the Jacob-Monod model, and for showing that the activity of certain genes can be modified by environmental temperature.
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