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(Q that has stumped me): An inducer has the following function(s)? A) Turns on repressors and...

(Q that has stumped me): An inducer has the following function(s)?

A) Turns on repressors and turns on activators

B) Turns on activators and turns off repressors

C) Turns on activators only

D) Turns off repressors only

Expert Solution

Correct Answer is Option B -Turns on activators and turns off repressors.

Inducer is a molecule which regulate the expression of the gene.

Inducer function by 2 mechanism

1)it inhibit the function of Repressor

Normal function of repressor is that ,it will bind with the DNA template and stops the transcription process by inhibiting the RNA polymerase.

Function of Inducer is that , it will bind with the repressor molecule and inhibit the function of repressor so that the RNA polymerase can transcribe the DNA template to mRNA.

2)Activation of Activators.

Activators are the molecules that upregulate the gene expression.

But activator only bind with the activator DNA sequencs in the presence of a inducer.

Inducer will bind with the activator and it forms. complex ,this complex will bind with the Activator DNA sequence.

By this 2 mechanism a inducer will increases the gene expression process.This process is called Induction.

Example for inducer is allolactose.

it is a Inducer in lac Operon.

gladiator answered 2 years ago

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