Question

who first identified dna?
rosalind franklin
erwin chargaff
friedrich miescher
james watson

Explanation:

Friedrich Miescher first identified DNA in 1869 while studying white blood cells. Rosalind Franklin's X - ray crystallography work helped in understanding DNA structure. Erwin Chargaff discovered base - pairing rules. James Watson, along with Francis Crick, proposed the double - helix structure of DNA.

Answer:

C. Friedrich Miescher