Answer:
He extracted and observed DNA from white blood cells.
Explanation:
F.Miescher was a Swiss physician and a Biologist.He was 41 years old.With his experimental processes he was able to isolate many compounds which contains phosphate from the nuclei of white blood cells.He called these chemicals nuclein.(Nuclei acids) This took place in a Felix-Hope seyler's Lab, In Germany.The discovery was in 1869.
