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What is constitutive expression?

Answer and explanation

Correct answer: Continuous expression of a gene

Constitutive expression is the continuous or nearly continuous production of a gene product because the gene is controlled by a promoter that remains active under the relevant conditions. Thus, option A is correct. This differs from inducible expression, in which transcription is switched on only after a particular signal or inducer is provided, and from repressible expression, in which a product can reduce transcription. Continuous expression may be useful when a steady amount of protein is needed, but it can waste cellular energy or harm the host if the protein is toxic or burdensome. The other options describe unrelated events: absence of DNA, death of the host, and cutting of a plasmid do not define constitutive expression.

Related tags

Constitutive ExpressionPromoterGene RegulationGenetic EngineeringPrinciples Of BiotechnologyBiotechnologyClass 11 Mcq

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