1. Season 1: Of Genes and Germs Episode 2: DNA Structure
Series: Genetics
Season 1: Of Genes and Germs
Episode 2: DNA Structure
Objective: Create a model to show the basic structure of a DNA molecule
Bell Ringer: get out your notebook and signed syllabus

2. Watson and Crick determined the 3-D structure of DNA.

3. Watson and Crick determined the 3-D structure of DNA.
They realized that DNA is a double helix

4. Watson and Crick determined the 3-D structure of DNA.
They realized that DNA is a double helix
backbone on the outside

5. Watson and Crick determined the 3-D structure of DNA.
They realized that DNA is a double helix
backbone on the outside
bases on the inside.

6. DNA is composed of nucleotides.

7. DNA is composed of nucleotides.
Each nucleotide has three parts.

8. DNA is composed of nucleotides.
Each nucleotide has three parts.
a phosphate group

9. DNA is composed of nucleotides.
Each nucleotide has three parts.
a phosphate group
a deoxyribose sugar

10. DNA is composed of nucleotides.
Each nucleotide has three parts.
a phosphate group
a deoxyribose sugar
a nitrogen-containing base

11. The nitrogen containing bases are the only difference in the four nucleotides.

12. Nucleotides always pair in the same way.

13. Nucleotides always pair in the same way.
Chargaff's Rule:

14. Nucleotides always pair in the same way.
Chargaff's Rule:
A pairs with T

15. Nucleotides always pair in the same way.
Chargaff's Rule:
A pairs with T
C pairs with G

16. Nucleotides always pair in the same way.
Chargaff's Rule:
A pairs with T
C pairs with G

17. DNA Model Activity
Follow the instructions on the packet
Due by end of class