Question

which of the following statements is not true for dapi staining?
a) the light source only emits uv light
b) dapi emits blue light
c) dapi is excited by uv light
d) dapi stains the cell nuclei

Explanation:

DAPI is a fluorescent dye used to stain cell nuclei (so d is true). It is excited by ultraviolet (UV) light (so c is true) and emits blue light when excited (so b is true). Fluorescence microscopes used for DAPI staining can have multiple light sources for different dyes, not only UV light, so statement a is false.

Answer:

a) The light source only emits UV light