Methylene blue can be used to stain DNA because it
A) forms ionic bonds with DNA.
B) changes the pH and therefore the structure of DNA.
C) covalently bonds with DNA.
D) makes DNA electron dense.
E) is an effective fixing agent for nucleic acids.

Question

Quizplus · Accepted Answer

Methylene blue is a positively charged dye that forms ionic bonds with negatively charged DNA molecules. This allows it to effectively stain the DNA and make it visible under a microscope.

Methylene Blue Can Be Used to Stain DNA Because It