in the experiments this semester, you saw many different colors. please select the color that most closely matches what you observed in these experiments. the color of dna as isolated from strawberries: colorless the color of the bromocresol green solution you used *before the addition of any albumin*: the color of the complex of dna with propidium iodide:



Answer :

A fluorescent DNA dye that is not membrane permeable is propidium iodide. For use in flow cytometry, in situ hybridization, and immunohistochemistry, it is utilized to stain apoptotic cells Belloc et al (1994). Additionally, it can be utilized to distinguish between necrotic and apoptotic cell death.

Propidium iodide stains DNA in what ways?

A cell-impermeant DNA binding dye that can be used to stain cells and nucleic acids is called propidium iodide (PI). One dye binds to every 4-5 base pairs of DNA when PI intercalates between the bases to bind to DNA. Sequence preference is either negligible or absent.

How do cells get stained with propidium iodide?

A membrane-impermeant dye called propidium iodide (PI) is often rejected from live cells. It intercalates between bases in double-stranded DNA to attach to it. PI is stimulated at 488 nm and emits at a maximal wavelength of 617 nm after a somewhat high Stokes shift.

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