What Molecule is Shown Below?

Question

What molecule is shown below? 
A) GFP 
B) FM4-64 
C) DNA 
D) RNA 
E) DAPI

Accepted Answer

The molecule shown is DAPI, a fluorescent dye often used to stain DNA in microscopy. It binds specifically to adenine-thymine rich regions of DNA, causing it to emit blue fluorescence upon excitation. The other choices are not applicable in this case. GFP is a protein, FM4-64 is a fluorescent dye used to label the endocytic pathway in cells, DNA and RNA cannot be visualized directly without staining or tagging, and GFP and FM4-64 are not shown in the image provided.