1. DNA REPLICATION
Chapter 11, Section 1

2. DNA Review What is the building block of DNA? Nucleotides
What is the shape of DNA?
Double Helix
What holds together the two strands of DNA?
Hydrogen bonds between complimentary nitrogen base pairs
During what part of the Cell Cycle does DNA replicate (copy itself)?
Interphase
What pairs with Guanine? Adenine?
Guanine & Cytosine, Adenine & Thymine
What are the complimentary bases for the following sequence? AATCCGC
TTAGGCG

4. How DNA Replicates DNA has to be replicated before a cell divides
New cells at the end of Mitosis need identical strands of DNA

5. One strand of DNA gets used as a template (pattern) to make a new strand that matches up with it
Special enzymes are required for DNA replication

6. Steps of DNA Replication
1. Replication begins with the unwinding & separation of the DNA double helix by enzymes called helicases
The process is like unzipping a zipper

7. 2. New strands are formed by enzymes called DNA polymerase which adds complimentary nucleotides to the original strands

8. Each new strand compliments one of the original strands
2 identical DNA double helix strands are the result of DNA replication

9. Uneven formation of DNA
When DNA is replicating one strand forms continuously and the other strand forms in chunks with spaces that need to be filled in

10. Biology /4/ Mrs. Turgeon
“Character is what a man is in the dark.” – Dwight L. Moody DO NOW: 1. In your notes: What is the name of the enzyme that unzips the zipper of the double helix? AGENDA: Students will be able to describe how DNA replication occurs by working in pairs HOMEWORK: Finish replication worksheet-due tomorrow!

11. Biology /5/ Mrs. Turgeon
“Quality is not an act, it is a habit.” – Aristotle DO NOW: 1. Pass forward replication worksheet 2. In your notes: What is the name of the enzyme that delivers free nucleotides AGENDA: Students will be able to describe how DNA affects twins by reading a scientific article

12. ANNOUNCEMENT: Science Club is meeting today! Be there or be square!!!!