BY 108 Chapter Notes - Chapter 14: Acetabularia, Growth Medium, Deoxyribonuclease
Document Summary
Hammerling experiment - determined where cells kept hereditary material. Used acetabularia cells, found that hereditary material in foot area. Thomas king/robert briggs - transplanted nuclei from frog cells. Showed that nuclei contained the information needed to direct development. F. c. steward - mixed fragments of carrot tissue w/ liquid growth medium. Showed that single cells can form entire, mature plants totipotent - containing full set of hereditary instructions. Griffith experiment - discovered transformation found that s. pneumoniae bacteria could only infect w/ polysaccharide coating. Dead bacteria w/ polysaccharide coating mixed w/ live bacteria w/o polysaccharide coating to form live bacteria w/ polysaccharide coating transformation - transfer of genetic material from one cell to another. Avery experiments - found the transforming principle from griffith "s experiments. Removed nearly all of the protein in s. pneumoniae, but transformation still occurred taking out lipids/proteins didn"t stop transformation. Purified mixture contained elements close to that of dna, had same density.
