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Lac Operon

The Operon re...

Question

The Operon regulates the gene expression at what level?

A

Inhibiting transcription of mRNA

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B

Inhibiting enzymes

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C

Inhibiting passage of mRNA

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D

Inhibiting substrate-enzyme reaction

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Solution

The correct option is A Inhibiting transcription of mRNA
Gene regulation can happen at various stages of protein synthesis. In the operon model, gene regulation happens at the transcriptional level, wherein the transcription of the respective gene and the production of mRNA is stopped by the regulator, as per requirement.

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Q. _________ genes are the one which directly control the switching off and on of the transcription process, in the operon model of gene regulation.

Q. Explain how structural genes of lac operon start transcription on addition of lactose.

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Q. Which of the following statement(s) is/are correct?
Statement 1: In prokaryotes, gene expression is generally regulated at the site of transcriptional initiation.
Statement 2 : In eukaryotes regulation of gene expression occurs at multiple levels

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.
b. Gene concept cannot be studied by the operon model.
c. Operons are segments of genetic material which function as a regulated unit that can be switched on and switched off.
d. An operon consists of one to seven structural genes.

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