1. Warm Up 2
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1. From this experiment, Griffith concluded that one strain of bacteria is changed in form by the gene of another. This is called ______________.

2. 2. When DNA is destroyed from heat killed poisonous sample, there is NO transformation. This means that it is _______ that stores and transmits genetic information.

3. 3. Hershey-Chase infected a cell with radioactive DNA, and then with radioactive protein. He concluded that the genetic material of the bacteriophage was ___________ not __________.

4. DeoxyriboNucleic Acid
DNA
Structure
DeoxyriboNucleic Acid

5. Nucleotides -make up DNA -has 3 parts
Phosphate
group
Nitrogenous
Base
Deoxyribose
5 carbon sugar

6. A C T G G A T C

7. DNA is made up of _____________________.

8. The three parts of a nucleotide are:

9. Nitrogen Bases A
Adenine T
Thymine C
Cytosine G
Guanine

10. Nitrogenous Bases Pure As Gold PURINES Adenine (A) , Guanine (G)
PYRIMIDINES
Cytosine (C) , Thymine (T)
All have Y’s- pYrimidines cYtosine thYmine

12. Chargaff’s Rule/Base Pairing # of A’s = T’s, # of C’s=G’s
Adenine (A)----Thymine (T)
bonded by hydrogen bond
AT&T
PYRIMIDINES
Cytosine (C)----Guanine (G)
Bonded by hydrogen bond
-Cingular

13. A C T G G A T C

14. Nucleotides
Sugar phosphate backbone
Nitrogen bases= steps to ladder

15. Which are the 2 purines? Which are the 2 pyrimidines?

16. Chargaff’s Rule states that A- _____ C- _____

17. Strands in DNA are twisted
There are 2 strands
Nitrogen bases are near the center

18. 1953 Watson and Crick Watson & Crick’s model of DNA was a
double helix in which 2 strands were wound around each other
Double helix-
2 stranded spiral

19. Who are the 2 men that discovered the structure of DNA?

20. What does double helix mean?