1. DNA Notes

2. Chromosomes
Made of DNA and protein

3. What does DNA look like?

4. DNA = Deoxyribonucleic Acid
Made up of nucleotides
Phosphate
Sugar (deoxyribose)
Base
4 types
Adenine (A)
Guanine (G)
Thymine (T)
Cytocine (C)

5. A nucleotide:

6. Chemically it looks like:

7. Scientific Contributions

8. Erwin Chargaff Amount of Adenine = Amount of Thymine
Amount of Cytosine = Amount of Guanine

9. Rosalin Franklin Used x-ray diffraction & learned….
DNA is spiral shaped

10. James Watson & Francis Crick
Created the first
model of DNA

11. The Twisted Ladder shape is called a……
Double Helix

13. Review:
Which of the following is not part of a nucleotide? a. base b. sugar c. fat d. phosphate

14. If a sample of DNA contained 20%cytosine, what percent of guanine would be in the sample?___________
What percent of adenine would be in the sample? ___________________

15. What would be the complimentary strand of DNA for this strand: ATG GTA

16. James Watson and Francis Crick….
a. Took X-ray pictures of DNA
b. Discovered that genes are in chromosomes
c. Made model’s to figure out DNA’s shape
d. Bred pea plant’s to study heredity

17. Create your own segment of DNA
Color code your molecules!
Rules:
1. Phosphates attach to sugars only
2. Sugars attach to phosphates & bases
3. Bases attach to sugars and with other
bases, but…
*Adenine will only pair with Thymine
*Guanine will only pair with Cytosine
One strand of DNA goes 3’ to 5’ while the other goes 5’ to 3’…that means one side is up side down!
5. Your strand must have 10 nucleotides!