Chapter 16: The Molecular Basis of Inheritance

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1 AP Biology Reading Guide Name Chapter 16: The Molecular Basis of Inheritance Concept 16.1 DNA is the genetic material 1. What are the two chemical components of chromosomes? 2. The search for identifying the source of Mendel s heritable factors and Morgan s genes on chromosomes began in the early 20 th century. Scientists believed the two likely candidates were the two chemicals you named above. Until the 1940 s, most believed proteins were responsible for heredity. However, the experiments of Griffith, Avery, and Hershey and Chase, caused others to question whether it was something other than proteins. Read through each experiment and summarize the design of their experiments, the results, and their final conclusions. Experimental Design Results Final Conclusion Hershey & Chase Avery Griffith 1

2 3. What are Chargaff s rules? How did he arrive at them? 4. List the three components of a nucleotide. 5. Who built the first model of DNA and shared the 1962 Nobel Prize for discovery of its structure? 6. What was the role of Rosalind Franklin in the discovery of the double helix? 7. Distinguish between the structure of pyrimidines and purines. Explain why adenine bonds only to thymine. 8. How did Watson and Crick s model explain the basis for Chargaff s rules? 9. Given that the DNA of a certain fly species consists of 27.3% adenine and 22.5% guanine, use Chargaff s rules to deduce the percentages of thymine and cytosine. 10. Name the five nitrogenous bases, and put a checkmark in the correct column for each base. Also indicate if the base is found in DNA (D), RNA (R), or both (B). Nitrogenous Base Purine Pyrimidine D, R, or B 2

3 11. Explain the base-pairing rule. 12. Describe the structure of DNA relative to each of the following: a. distance across molecule b. distance between nucleotides c. distance between turns d. components of the backbone e. components of the rungs 13. Explain what is meant by 5' and 3' ends of the nucleotide. 14. What do we mean when we say the two strands of DNA are antiparallel? Concept 16.2 Many proteins work together in DNA replication and repair 15. What is the semiconservative model of replication? 16. Explain how Meselson and Stahl confirmed the semiconservative mechanism of DNA replication. 17. Where does replication of a DNA molecule begin? What is unique about this starting point? 18. Distinguish between the leading and the lagging strands during DNA replication. 3

4 19. What is the direction of synthesis of the new strand? 20. a. What are Okazaki fragments? b. How are they welded together? 21. Now let s go back and review the enzymes used in DNA replication and their functions. Identify which enzyme does each of the following: Function a. untwists and separates strands Enzyme b. holds DNA strands apart c. synthesizes RNA primer d. adds DNA nucleotides to new strand e. relieves strain caused by unwinding f. joins DNA fragments together g. removes RNA primer and replaces with DNA 22. Put it all together! Make a detailed list of the steps that occur in the synthesis of a new strand. 4

5 23. Explain the roles of each of the following enzymes in DNA proofreading and repair. Enzyme Role DNA polymerase Nuclease Ligase Repair enzymes 24. Explain what happens if the wrong nucleotide is base paired. 25. Identify at least 4 things that can change nucleotides in ways that affect encoded genetic information. 26. How many different DNA repair enzymes have been identified in humans? 27. a. What is a thymine dimer? b. How might it occur? c. How is it repaired? 28. a. What are telomeres? b. What is their importance? 5

6 29. Explain telomere erosion and the role of telomerase. 30. Why are cancer cells immortal while most body cells have a limited life span? Concept 16.3 A chromosome consists of a DNA molecule packed together with proteins 31. Identify the relationship between histones and nucleosomes. 32. Distinguish between heterochromatin and euchromatin. 6

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