Dna strands are visualized by using what

Ethidium bromide is likely the most well-known dye used for visualizing DNA. It can be used in the gel mixture, the electrophoresis buffer, or to stain the gel after it is run. Molecules of the dye adhere to DNA strands and fluoresce under UV light, showing you exactly where the bands are within the gel. Despite its advantage, the downside is that ethidium bromide is a potential carcinogen, so it must be handled with great care.

the menstrual cycle – higher tier. negative feedback mechanisms affect the production of hormones in the menstrual cycle. oestrogen also stimulates the release of lh (luteinising hormone) from the pituitary gland, which in turn controls the production of progesterone.

if you add everything up correctly you should get 69 i got this because 50 plus 19 is it