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Download DNA Study Guide 1. The sides of a DNA molecule are made up of
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DNA Study Guide 1. The sides of a DNA molecule are made up of sugar molecules alternating with __________________molecules. 2. The order of bases along a gene determines the order in which ______________________ are put together to form a ____________________. 3. What forms a genetic code? __________________________________________________________________ 4. The genetic code is found in the order of nitrogen ____________________ along a gene. 5. During DNA replication, adenine (A) always pairs with _____________________________________________. 6. What letters would form the other stand on the DNA helix: ATCGGTTCA _______________________________ 7. Proteins are made up of smaller molecules called ____________________________________. 8. ___________________ is single-stranded. 9. Where does protein synthesis take place? _________________________________________________________ 10. What does messenger RNA do during protein synthesis? _____________________________________________ ___________________________________________________________________________________________ 11. Which nitrogen base is in RNA, but not DNA? ________________________________ 12. During protein synthesis, the protein continues to grow until _________________________________________. 13. Identify structure A. ___________________________________________________ 14. Identify structure D. ___________________________________________________ 15. What are the three nitrogen bases in tRNA that pair with bases A-G-U in mRNA? ________________________ 16. What is a mutation? __________________________________________________________________________ 17. How can a mutation affecting skin be harmful to an animal? __________________________________________ 18. How many different types of cancer are there? ___________________ 19. Cancer is a disease in which cells grow and divide _________________________________________. 20. Scientists think cancer begins when a ______________________________ occurs in the DNA. 21. Cancer can spread when cells break off a tumor and are carried through the body by the ___________________. 22. What is a cancer tumor? _______________________________________________________________________ 23. The most common treatments for cancer include drugs, surgery, and _________________________________. 24. What is chemotherapy? ________________________________________________________________________ 25. What are multiple alleles? ______________________________________________________________________ 26. What trait is controlled by a gene with multiple alleles? ______________________________________________ 27. Why does height have such a wide variety of phenotypes? ___________________________________________ 28. Human eyes come in a variety of colors. Explain why eye color is not likely controlled by a single gene. ________ ___________________________________________________________________________________________ 29. What combination of sex chromosomes results in a male human being? ________________ 30. Sex-linked genes are genes on the __________ and ____________ chromosomes. 31. Why are sex-linked traits more common in males than females? _______________________________________ ___________________________________________________________________________________________ 32. Is it possible for a son to inherit an allele on an X chromosome from his father? Explain. ___________________ ___________________________________________________________________________________________ 33. What is a carrier? _____________________________________________________________________________ 34. What must occur for a girl to be colorblind? _______________________________________________________ 35. Complete a Punnett square showing a cross between a colorblind father (XcY) and a carrier mother (XCXc). Remember that colorblindness is controlled by a recessive sex-linked allele. 36. What percentage of male children are likely to be colorblind? _____________ 37. In _________________________, organisms with desired traits are chosen to be parents of the next generation. 38. Crossing a potato that tastes good with one that resists disease is an example of _________________________. 39. Cloning results in two organisms that are _________________________________________________________. 40. What is an example of the benefits of genetic engineering? ___________________________________________