IB HL BIO Scientists unit one test

What did Hershy and Chargaff

Discovered that DNA is the genetic material of cells

found nucleic acids core phosphorus was in bacteria cells, confirming it was genetic material instead of radioactive sulfur

What did Erwin Chargaff discover

Different species have different percentages of the four nigtronious bases

This falsified the Tetranucleotide hypothesis that all of the four bases are equal

What did Rosalind Franklin discover

She used x-ray crystallography to revel the helix shape of the DNA

Photo 51, which she did not share, got leaked

She didn’t get credit because she was a woman

What did Watson and Crick discover

Used Franklin and Chargaffs findings to creat the double helix model

-double stranded helix structure

-chargaffs base pairing rule to confirm complementary base pairing