1. DNA Replication Practice Quiz

2. Who discovered the structure of DNA?

3. Answer:
Watson and Crick

4. What are the four nucleotides that make up the structure of DNA?

5. Answer:
A, T, G, C

6. How do the bases always match up?

7. Answer:
A=T
G=C

8. What makes up the backbones of DNA?

9. Answer:
Sugar and Phosphate

10. Name the three enzymes that we discussed in class in regard to DNA Replication.

11. Answer:
DNA Helicase
DNA Polymerase
DNA Ligase

12. Write what each of the following enzymes do: DNA Helicase DNA Polymerase DNA Ligase

13. Answer:
DNA Helicase – Unzips the DNA strand, or breaks the hydrogen bonds between bases.
DNA Polymerase – Puts in the new bases, in other words matches up A to T and G to C.
DNA Ligase – Seals in the gaps and completes the strand.

14. When nucleotides get added to the new strand, what end to they get added to?

15. Answer:
3’ end only

16. What is the shape of DNA?

17. Answer:
Double Helix

18. DNA Replication is described using two Semi’s, What are they?

19. Answer:
Semi Conservative – Each new cell gets one old strand and one new strand.
Semi Discontinuous – there is a lagging strand and a leading strand.

20. Describe what it means to be semi discontinuous.

21. Answer:

22. Show the Enzymes in DNA Replication.

23. Answer:
DNA Polymerase – remember it has two arms (not shown accurately in the picture above, refer to notes).
DNA Ligase – fills in the ozaki fragments and completes the strand.

24. How often does DNA Polymerase make a mistake?

25. Answer: 1 in every 10,000 base pairs
After enzymes double check the strand, a mistake is made 1 in every 1 billion base pairs.

26. What things can damage DNA?

27. Answer:
Chemicals
Sunlight
Normal mutations or mistakes in copying

28. Watch the following Videos to help show the process of DNA Replication. g