ch09 - Chapter 9: The Chemistry of Heredity and Gene...

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Chapter 9: The Chemistry of Heredity and Gene Expression Multiple-Choice Questions 1. Introduction; p. 163; moderate; ans: c The genetic material is composed chemically of: a. chromosomes. b. protein only. c. deoxyribonucleic acid only. d. ribonucleic acid only. e. protein and deoxyribonucleic acid in equal amounts. 2. The Structure of DNA; p. 163; easy; ans: c The purine bases of DNA are: a. cytosine and thymine. b. cytosine and adenine. c. adenine and guanine. d. guanine and cytosine. e. guanine and thymine. 3. The Structure of DNA; p. 163; moderate; ans: b Data obtained by Erwin Chargaff indicated that in DNA the ratio of nucleotides containing _________ to those containing _______ is approximately 1:1. a. adenine; cytosine b. adenine; thymine c. guanine; thymine d. thymine; cytosine e. guanine; adenine 4. The Structure of DNA; p. 163; easy; ans: b The DNA molecule has the shape of a: a. single helix. b. double helix c. triple helix. d. step ladder. e. staircase. 5. The Structure of DNA; p. 163; moderate; ans: c In the ladder analogy of DNA structure, the sides of the ladder are composed of: a. sugars. b. phosphates. c. alternating sugars and phosphates. d. alternating sugars and nitrogenous bases. e. nitrogenous bases.
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2 Chapter 9 The Chemistry of Heredity and Gene Expression 6. The Structure of DNA; p. 163; moderate; ans: e In the ladder analogy of DNA structure, the rungs are composed of: a. sugars. b. phosphates. c. alternating sugars and phosphates. d. alternating sugars and nitrogenous bases. e. nitrogenous bases. 7. The Structure of DNA; p. 165; easy; ans: a In a DNA molecule, the hydrogen bonds join: a. the paired nitrogenous bases. b. sugars and phosphates. c. sugars and nitrogenous bases. d. phosphates and nitrogenous bases. e. pairs of sugars. 8. The Structure of DNA; p. 165; easy; ans: d Which of the following are complementary bases? a. Adenine and cytosine b. Adenine and guanine c. Thymine and cytosine d. Guanine and cytosine e. Thymine and guanine 9. The Structure of DNA; p. 165; easy; ans: c Adenine forms ______ hydrogen bonds with thymine. a. zero b. one c. two d. three e. four 10. DNA Replication; pp. 166–167; moderate; ans: e Which of the following statements about DNA replication in eukaryotes is FALSE? a. It is a bidirectional process. b. Helicases break the hydrogen bonds at the origin of replication. c. DNA polymerases catalyze the synthesis of the new strands. d. The two replication forks move in opposite directions away from the origin. e. There is only one origin of replication.
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Chapter 9 The Chemistry of Heredity and Gene Expression 3 11. DNA Replication; p. 167; easy; ans: a After a DNA molecule “unzips,” the two strands are kept separated by: a. single-strand binding proteins. b.
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This note was uploaded on 10/27/2010 for the course BIOLOGY 2108 taught by Professor Winterrowd during the Spring '10 term at Middle Georgia State College.

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ch09 - Chapter 9: The Chemistry of Heredity and Gene...

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