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

Question

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

The molecule that serves as an inducer of the lac operon is Allolactose (option c).

Here's a step-by-step explanation:

  1. The lac operon is a set of genes in bacteria that are used to metabolize lactose when glucose is not available.

  2. The lac operon is usually inhibited by a protein called the lac repressor, which is produced by the lacl gene.

  3. When lactose is present in the environment, some of it gets converted into allolactose inside the bacterial cell.

  4. Allolactose then binds to the lac repressor, causing it to change shape and release from the lac operon.

  5. This de-repression allows the genes in the lac operon to be transcribed, and the bacteria can then metabolize the lactose.

So, the molecule that serves as an inducer of the lac operon is allolactose, because it's the presence of allolactose that ultimately allows the lac operon to be expressed.

This problem has been solved

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The inducer of the lac operon is lactose.

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

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

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

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