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In 1928, __________ was surprised to
find that when he
killed pathogenic bacteria, then mixed
the bacterial remains Frederick Griffith
with living harmless bacteria, some living
bacterial cells
became pathogenic.
In 1952, ___________ used bacterio-
phages to
show that DNA is the genetic material of Hershey-Chase
T2, a virus that infects the
bacterium Escherichia coli (E. coli).
__________ are viruses that infect bac-
terial Bacteriophages
cells.
______ discovered the relationships be-
Erwin Chargaff
tween DNA bases
______ Discovered the basic structure of
DNA by x-ray Rosalind Franklin
crystallography
______ Built the first accurate model of
James Watson and Francis Crick
a DNA molecule
The sugar in DNA is deoxyribose.
The sugar in RNA is ribose
Pyrimidines c,t and u
Purines a and g
Sides of DNA are_______ sugar and phosphate backbone
Rungs of a DNA are nitrogenous bases
A=T 2 Hydrogen bonds
G=C 3 hydrogen bonds
DNA stores information in the
base pairs
_________
amino acid
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