DNA
How did scientists figure out that DNA was the genetic material and the structure of DNA?
Oswald Avery
Hershey-Chase (1952)
What is DNA and why do living organisms have DNA?
Where is DNA found in the cell?
Human DNA
Nucleotides=smallest sub-units of DNA The building blocks of DNA
Nucleotides
Nitrogen bases
DNA Structure
Complementary Base Pairing
What is the complementary sequence?
Structure of DNA
Double helical structure
Negative charge on phosphates make DNA a polar molecule
Two strands are anti-parallel
What makes organisms different?
What makes humans different from each other?
The Race
Rosalind Franklin’s DNA x-ray
Watson and Crick
Model of DNA
Watson and Crick, 1953
How does DNA replicate? How does it make a copy of itself?
Semi-conservative Replication
Anti-parallel strands and DNA nucleotides can only be added to a 3’ end. (5’ to 3’ direction.)
Terms for Replication
Replication animations
DNA Replication
How are mistakes in the code minimized?