Unit Two

 Transforming principal of DNA  Bacteria are capable of passing genetic information to other bacteria

 Characterized different forms of nucleic acids: DNA and RNA  Determined nucleic acids are made of: adenine (A), thymine (T), cytosine (C), and guanine (G)

 Determined that DNA is the material in which genes and chromosomes are made.

 Proteins were not the genetic material, DNA was

 Research found picture of DNA  X-ray crystallography  Excluded from large discovery

 Discovered the “double helix” structure of DNA  Published paper without mentioning Rosalind Franklin (CONTROVERSY)

 Discovered three rules about DNA:  # of guanine equals # of cytosine  # of adenine equals # of thymine  # of A, T, C, G varies among species

 Deoxyribose sugar  Phosphate group

Guanine Thymine Cytosine Adenine