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An operon is an area of DNA that codes for a series of functionally associated genes under the manage of the same promoter.

You are watching: Why is the lac operon said to be an inducible operon?

In allosteric regulation, a tiny molecule binds to a large protein and also causes it to readjust its shape and task.

True or false? The mechanism by which glucose inhibits expression of the lac structural genes is well-known as catabolite stimulation, whereas the mechanism through which lactose stimulates expression of the lac structural genes is well-known as allosteric regulation.

False The procedure by which lactose binds to the lac repressor and inactivates it by causing it to adjust form is well-known as allosteric regulation. However, the process by which glucose reasons cAMP levels in the cell to drop, thereby preventing CAP from stimulating expression of the lac structural genes, is known as catabolite repression.


In this computer animation the blue sphere represents _____.

lactose Lactose inactivates the repressor protein so that the lactose-utilization genes can be transcribed.


Which of these is a regulatory gene?

Some creates of chromatin alteration can be passed on to future generations of cells.Acetylation of hirock tails in chromatin allows accessibility to DNA for transcription.Acetylation of histone tails is a reversible process.DNA is not transcribed once chromatin is packaged tightly in a condensed develop.Methylation of hirock tails in chromatin have the right to promote condensation of the chromatin.

The fantasin gene will certainly be transcribed at a high level once activators specific for manage facets A, B, and C are current in the cell.Control elements C, D, and E are distal control facets for the imaginin gene.Both the fantasin gene and the imaginin gene will certainly be transcribed at high levels once activators certain for control aspects A, B, C, D, and also E are current in the cell.


Which of the complying with choices represent mRNA molecules that could be produced from the main RNA transcript by alternate RNA splicing? (In each alternative, the yellow component on the left represents the 5" cap, and the yellow part on the ideal represents the poly-A tail.)




Which of these indicates an enhancer region?


The process of transcription is shown by the letter _____.

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A Transcription is the procedure by which information encoded in DNA is converted to information encoded in RNA.

In human beings, the hormone testosterone enters cells and also binds to specific proteins, which consequently bind to specific sites on the cells" DNA. These proteins most likely act to carry out what?

It is possible for a cell to make proteins that last for months; hemoglobin in red blood cells is a good example. However, many proteins are not this long-lasting; they might be degraded in days, hours, or even minutes. What is the advantage of short-lived proteins?

All your cells contain proto-oncogenes, which have the right to adjust right into cancer-causing genes. Why perform cells possess such potential time bombs?

If a details operon encodes enzymes for making an important amino acid and also is regulated prefer the trp operon, then

What would certainly occur if the repressor of an inducible operon were mutated so it could not bind the operator?

Proto-oncogenes have the right to change right into oncogenes that reason cancer. Which of the complying with best describes the visibility of these potential time bombs in eukaryotic cells?