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Operon Model_ Lac and Trp Operons MCQs for Competitive Exams

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Operon Model_ Lac and Trp Operons MCQs for Competitive Exams

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Topic Notes: Operon Model_ Lac and Trp Operons

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Operon Model_ Lac and Trp Operons MCQs in Biology are useful for candidates who need targeted practice for CSS, PMS, FPSC, PPSC, NTS, entry tests, and other competitive exams in Pakistan. This topic page is designed for quick revision, repeated practice, and exam-focused preparation.

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1
Which enzyme is responsible for facilitating the transport of lactose into the bacterial cell?
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2
Which structural genes are present in the lac operon of Escherichia coli?
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3
Match the following operons with the number of structural genes they contain.
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4
What is the functional consequence of an active repressor binding to an inducer molecule to form an R-I complex?
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5
What term describes enzymes that are synthesized continuously by structural genes through the transcription of mRNA, regardless of the cell's environmental conditions?
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6
What term describes the gene expression regulation mechanism that allows cells to conserve energy and survive during periods of starvation or nutrient limitation?
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7
Which of the following compounds serves as a synthetic inducer for the lac operon in laboratory research?
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8
Which researchers first proposed the operon model as a mechanism for the regulation of gene expression in prokaryotes?
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9
During the regulation of protein synthesis, what is the immediate effect when a corepressor molecule is present in the system?
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10
Regarding the operon model of gene regulation, which of the following statements are correct?
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