1. Deoxyribose Nucleic Acid
DNA
Deoxyribose Nucleic Acid

3. DNA…your book of life
Would you want to know?

4. The information
stored on DNA
from one human cell
Equals the amount of
information
in 1000, 500 page books.

5. 2 Main Functions of DNA
Carry the Code of Life-instruction manual for every living organism
2. Blueprint for making proteins

6. The structure was discovered in 1953 by two scientists: James Watson & Francis Crick

7. Double Helix=shape of DNA

8. Nucleotides are the basic structural units of DNA and consist of 3 things:
Phosphate 2. Sugar (Deoxyribose)
Nitrogen Base (Can be a Pyrimidine or Purine)

9. Purine = Adenine (A), Guanine (G)
Nitrogen Bases
Purine = Adenine (A), Guanine (G)
Pyrimidine =Thymine (T), Cytosine (C)
*All 3 have a Y
Watson’s Discovery Watson's Ideas

10. Nitrogen Bases attached to Deoxyribose (sugar)
Base Pairing
A-T
C-G
Nitrogen Bases attached to Deoxyribose (sugar)
Chagraff’s Rule

11. Thymine always pairs with Adenine Guanine always pairs with Cytosine
Hydrogen bonds are the glue that hold everything together
Sugar – Deoxyribose
Phosphate Groups (spacer)
Nitrogen Bases – Code of Life in ATCG
Thymine always pairs with Adenine
Guanine always pairs with Cytosine
A T
T A
C G
G C
G C
G C

12. What makes up the “Backbone” of the DNA Double Helix?
Which structure in the backbone is directly attached to the Nitrogen bases?
What are the “spacers” between each step?
Why were Mike&Ikes a good example for the purines?
Why were Skittles a good example for the pyrimidines?

13. DNA must replicate or make a copy of itself before a cell can divide.
Play DNA Replication video from PBS in home folder
Remember Interphase?

14. If the original strand of DNA is AATTGGCC
DNA Replication – DNA makes a copy of itself
Important during meiosis & mitosis because it makes sure the daughter cells have the appropriate number of chromosomes.
DNAi animation
If the original strand of DNA is AATTGGCC
The complementary strand of DNA is TTAACCGG