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Lac Operon

In E.coli, an...

Question

In E.coli, an operator gene binds

A

Inducer gene to switch on structural gene action

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B

Inducer gene to switch off structural gene action

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C

Regulator protein (repressor) to switch off structural gene action

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D

Regulator protein to switch on gene action

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Solution

The correct option is B Regulator protein (repressor) to switch off structural gene action

Regulation of gene expression includes a wide range of mechanisms that are used by cells to increase or decrease the production of specific gene products (protein or RNA), and is informally termed gene regulation. An operator is a segment of DNA to which a transcription factor protein binds. It is classically defined in the lac operon as a segment between the promoter and the genes of the operon.
So, the correct answer is 'Regulator protein (repressor) to switch off structural gene action'

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Q. Which is incorrect? a. Gene expression refers to the molecular mechanism by which a gene expresses a phenotype by synthesizing a protein or an enzyme, which determines the character.
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Q. Considering lac operon, match the following:

\begin{matrix} C o l u m n I & C o l u m n I I p . R e g u l a t o r g e n e & i . B i n d i n g s i t e f o r r e p r e s s o r p r o t e i n q . O p e r a t o r g e n e & i i . C o d e (s) f o r t h e p r o t e i n o f t h e e n z y m e s r . P r o m o t e r g e n e & i i i . C o d e (s) f o r r e p r e s s o r p r o t e i n s . S t r u c t u r a l g e n e s & i v . B i n d i n g S i t e f o r R N A p o l y m e r a s e \end{matrix}

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