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3. The lac operon is an example of a(n)a) constitutive geneC) repressed geneb) induced gened) two of the above

Question

  1. The lac operon is an example of a(n)a) constitutive geneC) repressed geneb) induced gened) two of the above
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Solution

The lac operon is an example of both an induced gene and a repressed gene.

Here's why:

  1. Induced gene: The lac operon is normally switched off, but in the presence of lactose (the inducer), it is switched on. This is because lactose binds to the repressor protein and prevents it from binding to the operator. This allows RNA polymerase to bind to the promoter and transcribe the genes, thus it is an induced gene.

  2. Repressed gene: In the absence of lactose, the lac operon is switched off. This is because the repressor protein binds to the operator, preventing RNA polymerase from binding to the promoter and transcribing the genes. Thus, it is also a repressed gene.

So, the answer is d) two of the above.

This problem has been solved

Similar Questions

8. The lac operon, when using lacl, is regulated by a(n)a) activator and inducerc) activator and co-repressorb) repressor and inducerd) repressor and co-repressor

Regulation of bacterial operons by inducers, e.g. lactose, exhibits which of the following properties?(1) Inducer binds to the repressor and __________(2) Inducer effect on RNA polymerase binding to the promoter: ___________(3) Repressor produced by:Select one:A.(1) Activates the repressor, (2) Enhances, (3) A separate geneB.(1) Inhibits the repressor, (2) No effect, (3) A separate geneC.(1) Inhibits the repressor, (2) Inhibits, (3) Genes of the operonD.(1) Activates the repressor, (2) Inhibits, (3) A separate geneE.(1) Activates the repressor, (2) Enhances, (3) Genes of the operon

4. What molecule serves as an inducer of the lac operon?a) Lactosec) Allolactoseb)e) lacl

A. coding sequence B.promoter C. repressor D. operator sequence E. inducer 33.____ turns off the lactose operon when glucose is abundant or lactose is absent 34.____ turns on the lactose operon by binding the repressor 35.____ sequence for binding of RNA polymerase 36.____Structural genes for lactose utilization 37.____sequence that binds the repressor

Which of the following would not be a component of an operon?ANSWERPromoterStart codonOperatorStructural genes

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