1. 5’
3’
T
A
C
G
A
T
T
A
C
G
KEY:
- Phosphate
T
A
- Sugar
C
G
A
C
T
G
- Adenine
- Thymine
C
3’
T
A
5’
- Cytosine
G
- Guanine

2. 5’
3’
T
A
C
DNA helicase unzips the
DNA strand
G
A
T
T
A
C
KEY:
G
- Phosphate
A
- Sugar
T
A
T
C
- Adenine
- Thymine
G
3’
T
C
G
A
5’
- Cytosine
G
C
- Guanine
- Hydrogen Bonds

3. 5’
3’
T
A
C
G
A
T
T
A
C
KEY:
G
- Phosphate
A
- Sugar
T
A
T
C
- Adenine
- Thymine
G
3’
T
C
G
A
5’
- Cytosine
G
C
- Guanine
- Hydrogen Bonds

4. 5’
3’
T
A
C
G
A
T
T
A
C
KEY:
G
- Phosphate
- Sugar
T
A
A
T
C
- Adenine
- Thymine
G
3’
T
C
G
DNA
A
5’
- Cytosine
G
C
- Guanine
- Hydrogen Bonds

5. 5’
3’
T
A
C
G
A
T
C
T
A
KEY:
G
- Phosphate
- Sugar
T
A
A
T
C
- Adenine
- Thymine
G
3’
T
C
G
DNA
Helicase
A
5’
- Cytosine
G
C
- Guanine
- Hydrogen Bonds

6. 5’
3’
T
A
C
G
A
T
C
T
A
KEY:
G
- Phosphate
- Sugar
T
A
A
T
C
C
3’
T
- Adenine
- Thymine
G
DNA
Helicase
C
A
5’
- Cytosine
G
G
- Guanine
- Hydrogen Bonds

7. 5’
3’
T
A
C
G
A
T
C
T
A
KEY:
G
- Phosphate
- Sugar
T
A
A
T
C
C
3’
T
- Adenine
- Thymine
G
DNA
Helicase
C
A
5’
- Cytosine
G
G
- Guanine
- Hydrogen Bonds

8. 5’
3’
T
A
C
G
A
T
C
T
A
KEY:
G
- Phosphate
- Sugar
T
A
A
C
- Adenine
T
- Thymine
G
DNA
Helicase
3’
T
C
G
A
5’
- Cytosine
G
C
- Guanine
- Hydrogen Bonds

9. 5’
3’
T
A
C
G
A
T
T
A
KEY:
G
C
- Phosphate
- Sugar
T
A
A
C
DNA
Helicase
- Adenine
T
- Thymine
G
3’
T
C
G
A
5’
- Cytosine
G
C
- Guanine
- Hydrogen Bonds

10. 5’
3’
T
A
C
G
A
T
T
A
KEY:
G
C
- Phosphate
- Sugar
T
A
DNA
Helicase
- Adenine
T
C
A
- Thymine
G
3’
T
C
G
A
5’
- Cytosine
G
C
- Guanine
- Hydrogen Bonds

11. 5’
3’
T
A
C
A
G
T
T
A
C
KEY:
G
- Phosphate
A
DNA
Helicase
- Sugar
T
- Adenine
T
C
A
- Thymine
G
3’
T
C
G
A
5’
- Cytosine
G
C
- Guanine
- Hydrogen Bonds

12. 5’
3’
T
A
C
A
G
T
T
A
C
KEY:
G
- Phosphate
A
DNA
Helicase
- Sugar
T
A
T
C
- Adenine
- Thymine
G
3’
T
C
G
A
5’
- Cytosine
G
C
- Guanine
- Hydrogen Bonds

13. 5’
3’
T
A
C
A
G
T
T
A
C
G
KEY:
DNA
Helicase
A
- Phosphate
- Sugar
T
A
T
C
- Adenine
- Thymine
G
3’
T
C
G
A
5’
- Cytosine
G
C
- Guanine
- Hydrogen Bonds

14. 5’
3’
T
A
C
G
A
T
T
C
A
A
DNA
Helicase
KEY:
G
- Phosphate
- Sugar
T
A
T
C
- Adenine
- Thymine
G
3’
T
C
G
A
5’
- Cytosine
G
C
- Guanine
- Hydrogen Bonds

15. 5’
3’
T
A
C
G
A
T
C
T
DNA
Helicase
A
KEY:
G
- Phosphate
A
- Sugar
T
A
T
C
- Adenine
- Thymine
G
3’
T
C
G
A
5’
- Cytosine
G
C
- Guanine
- Hydrogen Bonds

16. 5’
3’
A
T
C
G
A
T
C
T
DNA
Helicase
A
KEY:
G
- Phosphate
A
- Sugar
T
A
T
C
- Adenine
- Thymine
G
3’
T
C
G
A
5’
- Cytosine
G
C
- Guanine
- Hydrogen Bonds

17. 3’
5’
A
C
A
T
DNA
Helicase
G
T
T
A
C
G
KEY:
- Phosphate
A
- Sugar
T
A
T
C
- Adenine
- Thymine
G
3’
T
C
G
A
5’
- Cytosine
G
C
- Guanine
- Hydrogen Bonds

18. 3’
5’
A
T
C
A
G
T
T
A
C
G
KEY:
- Phosphate
A
- Sugar
T
A
T
C
- Adenine
- Thymine
G
3’
T
C
G
A
5’
- Cytosine
G
C
- Guanine
- Hydrogen Bonds

19. 3’
5’
A
T
C
A
T
DNA primase
catalyzes the
synthesis of a short
RNA.
G
T
KEY:
A
- DNA primase
C
G
- Phosphate
A
- Sugar
T
A
T
C
- Adenine
- Thymine
G
3’
T
C
G
A
5’
- Cytosine
G
C
- Guanine
- Hydrogen Bonds

20. 3’ RNA primer is several strands of RNA
added to the lagging strand. It will
begin synthesis of the lagging strand.
5’
A
T
C
A
KEY:
G
- DNA polymerase
III
T
T
C
- RNA primer
A
G
- DNA primase
- Phosphate
A
- Sugar
T
A
T
C
- Adenine
- Thymine
G
3’
T
C
G
A
5’
- Cytosine
G
C
- Guanine
- Hydrogen Bonds

21. 3’ DNA polymerase 1 can add
free nucleotides.
5’
A
T
C
A
KEY:
G
- DNA polymerase 1
- DNA polymerase
III
T
T
C
- RNA primer
A
G
- DNA primase
- Phosphate
A
- Sugar
T
A
T
C
- Adenine
- Thymine
G
3’
T
C
G
A
5’
- Cytosine
G
C
- Guanine
- Hydrogen Bonds

22. 3’
5’
T
A
C
A
T
A
G
C
T
A
KEY:
- DNA ligase
G
- DNA polymerase 1
- DNA polymerase
III
T
T
C
- RNA primer
A
G
- DNA primase
- Phosphate
A
- Sugar
T
A
T
C
- Adenine
- Thymine
G
3’
T
C
G
A
5’
- Cytosine
G
C
- Guanine
- Hydrogen Bonds

23. 3’
5’
T
A
T
A
G
C
C
T
A
T
A
C
G
T
A
KEY:
Leading strand
G
Lagging strand
T
A
T
A
G
C
- Phosphate
- Sugar
T
A
A
C
C
3’
T
G
G
A
C
C
T
- Adenine
T
- Thymine
G
C
A
5’
- Cytosine
G
G
- Guanine
- Hydrogen Bonds