Question

Some stains bind to specific molecules within cells and emit light when viewed using a fluorescence microscope. What are those stains called?

Options:
a) Acid stains
b) Basic stains
c) Fluorescent stains
d) Chromogenic stains
e) Differential stains

Answer 1

Fluorescent stains bind to molecules in cells and emit visible light when excited by UV light, allowing observation under a fluorescence microscope.

Step-by-step explanation:

The stains that bind to specific molecules within cells and emit light when viewed using a fluorescence microscope are called fluorescent stains. These stains, or fluorochromes, are absorbed by the cells and emit a visible light when excited by light of a particular wavelength, usually ultraviolet (UV) light. Examples of such stains include 4',6'-diamidino-2-phenylindole (DAPI), which stains nuclei, and fluorescein isothiocyanate (FITC), commonly used to label antibodies.