​Name the blue-fluorescent dye that can be used to stain living or fixed cells.

Correct option is D

The correct answer is option (D) DAPI

• DAPI (4',6-diamidino-2-phenylindole) is a blue-fluorescent dye that is commonly used to stain living or fixed cells.
• It specifically binds to DNA by intercalating between base pairs, and under UV light, it fluoresces blue. DAPI is widely used in fluorescence microscopy for nuclear staining in cell biology.
  

Information Booster :-

•  BODIPY: BODIPY is a family of fluorescent dyes that can be used for various purposes, including labeling lipids and proteins.
  
•  Fuchsin: Fuchsin is a red-fluorescent dye often used for tissue staining.
  
•  Phalloidin: Phalloidin is used to stain actin filaments (F-actin) in cells and is typically conjugated to a fluorescent dye like Alexa Fluor.