Question

$\huge\underline\mathtt{Question}$


Why does the lac operon shut down sometime after the addition of lactose in the medium where E.coli was growing? Why low-level expression of the lac operon is always required?





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Answer 1

The Lactose operon is negatively regulated.

The Lactose operon is negatively regulated. When beta-galactosidase is synthesized enough, it breaks down Lactose into glucose and galactose.

The Lactose operon is negatively regulated. When beta-galactosidase is synthesized enough, it breaks down Lactose into glucose and galactose.Lactose is removed from the repressor and the repressoor binds to the operator inhibiting the lactose structural gene expression.

or binds to the operator inhibiting the lactose structural gene expression.So, the lactose operon is turned off.

or binds to the operator inhibiting the lactose structural gene expression.So, the lactose operon is turned off.Low level of lactose operon expression allows synthesis of Permease enzyme from the structural genes to allow lactose to enter the cell when it is present in the medium.

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Answer 2

Answer:

your fast questions this answer

Explanation:

When we say simple or complex organisms we are talking in terms of evolutionary history of an Organism. A 'simple organism' is considered to be primitive and has simple thallus organisation; The level of complexity of metabolism is also low.