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Name ______________________________________ Date ______________ Class __________

DNA Replication Worksheet

Use the diagram to answer the questions to the right.

The diagrams below show the steps of DNA replication. Put the steps in order (1-3).

7. __________________ 8. __________________ 9. ___________________

10. What is the first step in DNA replication? ______________________________________________________ __________________________________________________________________________________________.

11. What enzyme matches the bases of free nucleotides to the bases on the parent strand? ______________________________________________

12. If the DNA double helix were a twisted ladder, what would the sides of the ladder be made of? ______________________________________________________________

13. What would the rungs of the ladder be made of? ______________________________________________

Complete the table below.

|NUCLEOTIDE BASE |ABBREVIATION |COMPLEMENTARY BASE |

|14. |T |18. |

|15. |C |19. |

|16. |A |20. |

|17. |G |21. |

Using Biology Book pgs 300-306

22. The three main types of RNA are ____________________, _____________________, and ______________.

23. Copying part of a nucleotide sequence of DNA into a complementary sequence in RNA is called _________________________________.

24. An enzyme that binds to DNA during transcription is RNA _____________________________.

25. During the process of __________________________, the information carried by mRNA is used to produce proteins.

26. Each tRNA molecule contains three unpaired bases, called the ___________________________, which ensure that amino acids are added in the correct sequence.

27. How are DNA and RNA similar and how are the different? ______________________________________ ___________________________________________________________________________________________

Completion Choose the words that correctly complete the following sentences.

28. During DNA replication, the DNA molecule __________________ (separates/combines) into two strands.

29. At the end of DNA replication, ______________________ (four/two) new strands of DNA have been produced, giving a total of ___________________ (four/six) strands of DNA.

30. New DNA is replicated in strands complementary to old DNA because production of new DNA follows the rules of ___________________________ (base pairing/the double helix).

Identifying Structures On the lines corresponding to the numbers on the diagram, write whether the strand pointed to is an ORIGINAL strand or a NEW strand.

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1. Which of the labeled DNA strands are the parent strands? ____________

2. Which of the labeled strands are newly synthesized DNA? ___________

3. What nucleotide will be added to strand B next? ___________

4. What nucleotide will be added to strand C next? ___________

5. What holds the bases in strands A and B together? ___________

6. What holds the backbone of strand A together? ___________

31.

34.

33.

32.

31. ____________________________

32. ____________________________

33. ____________________________

34. ____________________________

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