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Persefone
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It's about lacZ E coli's failure to showing galactoside permase activity after adding lactose without glucose's presence. why ?
LacZ E coli is a gene found in the bacterium Escherichia coli. It codes for an enzyme called beta-galactosidase, which is responsible for breaking down lactose (a sugar found in milk) into glucose and galactose. This allows E coli to use lactose as a source of energy when glucose is not available.
LacZ E coli has a secondary function as a galactoside permase. This means that it can transport galactose into the cell, where it can be converted into glucose for energy production. This allows E coli to survive and reproduce even in the absence of glucose.
Studying LacZ E coli can help us understand how bacteria adapt to different environments and how they utilize different energy sources. It also has practical applications in the development of biotechnology and genetic engineering techniques.
Yes, LacZ E coli activity can be regulated by the presence or absence of glucose. When glucose is present, the bacterium will use it as the preferred source of energy and LacZ E coli will not be as active. However, when glucose is not available, LacZ E coli activity will increase to allow the bacterium to use alternate energy sources.
No, LacZ E coli is also found in other bacteria, such as Salmonella and Klebsiella. It is a common gene that has been conserved throughout evolution due to its important role in lactose utilization.