Methylene blue can be used to stain DNA because it: (2 pts) forms ionic bonds with DNA changes the pH and therefore the structure of DNA makes DNA electron dense is an effective chemical fixative for cells is none of the above

Methylene blue can be used to stain DNA of a cell because it (forms ionic bonds with DNA).

Explanation:

To examine the components of a cell usually under a microscope, a stain or dye is being used to provide a clear and defined view of the area under study.

The deoxyribonucleic acid (DNA) of a cell which contains the hereditary information of the cell is located in the nucleus.

Methylene blue is a type of stain used by biologists which helps them view microscopic life in brilliant color. It is a cationic stain (positively charged blue dye); and binds to negatively charged parts of the cells, such as nucleus (DNA) and RNA in the cytoplasm (with lower affinity).

When DNA of a cell comes in contact with methylene blue on a slide, their opposite charges attract, causing methylene blue's "rings" to slide in between the "rungs" of the DNA "ladder." As a result, a rich blue stain that identifies the location of the cell nucleus can be observed. This produces a photosensitive reaction which can then be viewed under the microscope.

Therefore is can be used to stain the DNA of cell because it forms ionic bonds with DNA.

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