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Assuming you are asking about blue-white screening in transformation of plasmids...

The agar plate has X-gal in it. If a colony of E. coli has beta-galactosidase (an enzyme expressed from the lac operon in the vector) present, it will break down the x-gal and turn the colony blue. If the colony does not express beta-galactosidase (because the LacZ gene has been interrupted by a ligated gene that you want to express), it will not metabolize the x-gal, thus not turning blue.

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Q: Why do transformed cells form white colonies?
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Related questions

Red blood cells and white blood cells work together to form?

red and white blood cells work together to form what


What are some types of cells that have been transformed?

transformed cell lines divide more rapidly and do not require attachment to surface for growth, the loose contact inhibition, when reintroduced to animals may form tumours


Sugar's chemical bonds are transformed into a potent form of energy known as?

The chemical bonds of sugar are transformed into a potent form of energy known as ATP. It is responsible for transporting chemical energy within cells that will be used for metabolism.


Where do red blood cells and white blood cells form?

Red and white blood cells produce in bones. The bone marrow produces the cells


Does white blood cells have a large form?

Yes they do.


In which organ WBC's form?

The White Blood Cells form in the lymphoid organs.


How do white blood cells form?

White blood cells form in response to an infection. As soon as the body detects a viral or bacterial infection, the immune system starts producing an army of white blood cells. They are produced in the bone marrow.


Cells that live in fresh water and form colonies shaped like hollow balls?

The answer is Volox


What adaptive advantage might there be for bacteria to form groups of cells?

An adaptive advantage regarding bacteria forming groups of cells is that these groups of cells can eventually become colonies.


White blood cells form the basis of what system in the body?

White cells play important roles in the immune system.


What did Griffith find to be true after his experiments with the s and r strain of bacteria?

Griffith hypothesized that a chemical component from the virulent S cells had somehow transformed the R cells into the more virulent S form.


What is the definition of the word 'transformed'?

The definition of the word transformed is "To change markedly the appearance or form." A sentence that includes the word transformed is: "Transformed when incorporated into this concoction."