Why is it important that a few β -galactosidase molecules be present in E. coli even if these cells have been growing on a lactose-free medium?

Name: Why is it important that a few β -galactosidase molecules be present in E. coli even if these cells have been growing on a lactose-free medium?
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The Answer of Why is it important that a few β -galactosidase molecules be present in E. coli even if these cells have been growing on a lactose-free medium?

Why Is It Important That a Few β -Galactosidase Molecules