In this experiment of Monod's the b-galactosidase enzyme appeared almost immediately when lactose was added to growing culture in the presence of lactose activates a pre-existing , but inactive , b-galactosidase.
Monod's experiment with the E.coli to see if when exposed to sugars, those cells always produced new enzymes or if instead they had enzymes that rearranged themselves. According to this - the set of genes that are transcribed in the prokaryotes are under the control of operons.
An enzymes b- gaalactosidase cleaves the disaccharide lactose by which it produce the galactose and glucose which then ultimately enter in process of glycolysis. Also causes transgalactosylation reaction of lactose to allolactose.
To learn more about the Monod's experiment here
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