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Name ______________________________________ Date ______________ Class __________ DNA Replication Worksheet Use the diagram to answer the questions to the right. 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? ___________ 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 14. ABBREVIATION T COMPLEMENTARY BASE 18. 15. C 19. 16. A 20. 17. G 21. 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. 32. 31. 31. ____________________________ 32. ____________________________ 33. ____________________________ 34. ____________________________ 33. 34.