Question

40 points

why is methyl blue added to a slide? Observe a cheek cell preparation where cheek cells were exposed to methyl blue

Answer 1

Because of its affinity for DNA and RNA, methylene blue will produce a darker stain in areas where those components are present. In the case of the human cheek cell, methylene blue causes the DNA in the nucleus to stand out so that the nucleus can clearly been seen in a light microscope.