What was Friedrich Miescher's contribution to the discovery of the genetic code?
A.He created the first photograph of the structure of DNA.
B.He discovered how the DNA bases pair together.
C.He created the first accurate model of DNA's structure.
D.He extracted and observed DNA from white blood cells.
Answers
It was The Friedrich Miescher who identified DNA as a distinct molecule for the first time. In 1869, he isolated 'nuclein' DNA with associated Protiens, from cell nuclei.
So according to the question and given options, the option D is the correct option.
Friedrich Miescher extracted and observed DNA from white blood cells. It is his contributions toward the field of genetics & and genetic engineering.
Friedrich Miescher: A Swiss physician and biologist who was the first to isolate nucleic acid.
He worked as a scientist and biologist at the Physiological Laboratory of the University of Basel and in Tübingen.
In the year 1869, he extracted the chemical "nuclein"
Nuclein: DNA with associated proteins which is extracted from cell nuclei.
He identified that the DNA is a distinct molecule and provided reasons for his hypothesis.
He also extracted various phosphate-rich chemicals.
They were extracted from the nuclei of white blood cells.
This identification paved way for the identification of DNA as the carrier of inheritance.
Hence, (D) He extracted and observed DNA from white blood cells is the answer.