DNA and RNA Chapter 12-1 - UrbanDine
DNA and RNA
Chapter 12-1
GENETIC MATERIAL
In the middle of the 1900's scientists were asking questions about genes.
What is a gene made of? How do genes work? How do genes determine
characteristics of organisms?
DO PROTEINS CARRY THE GENETIC CODE?
At the time most scientists believed that _p_r_o_te_i_n_s __ had to be the molecules that made up genes.
There were so many different kinds proteins and DNA seemed to be too monotonous . . . repeating the same __4_ subunits.
Griffith's experiment
1928 ? Frederick Griffith looked at pneumonia bacteria trying to figure out what made people die
S (SMOOTH) strain - killed mice
R (Rough) strain -mice lived
If he heated the LETHAL strain first
__. _._.___m_ic_e__liv_e_d_._
The heat killed bacteria were no longer LETHAL.
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