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Which feature helps a vector express the desired gene?

Answer and explanation

Correct answer: Promoter

The governing concept is transcriptional control in an expression vector. A promoter is a specific DNA sequence recognized by the host's transcription machinery, including RNA polymerase and associated factors. It determines where transcription of the inserted gene begins and often influences the level and conditions of expression. Therefore option A is correct: an appropriate promoter helps the vector express the desired gene by initiating transcription. An antibiotic plate is useful for selecting cells that carry a marker, but it does not start transcription of the target gene. Water and a fat layer have no role as promoter elements or as standard mechanisms for gene expression.

Related tags

PromoterTranscriptionExpression VectorCloning VectorsPrinciples Of BiotechnologyBiotechnologyClass 11 Mcq

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