DNA Structure and Replication

A 12 b 24 c 31 d 38 e it cannot be determined from

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A 12 B 24 C 31 D 38 E It cannot be determined from the information provided.
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Name: ________________________ ID: A 3 ____ 15. Chargaff's analysis of the relative base composition of DNA was significant because he was able to show that A the relative proportion of each of the four bases differs from species to species. B the human genome is more complex than that of other species. C the amount of A is always equivalent to T, and C to G. D both A and C E both B and C ____ 16. All of the following can be determined directly from X-ray diffraction photographs of crystallized DNA except the A diameter of the helix. B helical shape of DNA. C sequence of nucleotides. D spacing of the nitrogenous bases along the helix. E number of strands in a helix. ____ 17. The DNA double helix has a uniform diameter because ____, which have two rings, always pair with ____, which have one ring. A purines; pyrimidines B pyrimidines; purines C deoxyribose sugars; ribose sugars D ribose sugars; deoxyribose sugars E nucleotides; nucleoside triphosphates ____ 18. What kind of chemical bond is found between paired bases of the DNA double helix? A hydrogen B ionic C covalent D sulfhydryl E phosphate ____ 19. Which of the following statements does not apply to the Watson and Crick model of DNA? A The two strands of the DNA form a double helix. B The distance between the strands of the helix is uniform. C The framework of the helix consists of sugar-phosphate units of the nucleotides. D The two strands of the helix are held together by covalent bonds. E The purines form hydrogen bonds with pyrimidines. ____ 20. It became apparent to Watson and Crick after completion of their model that the DNA molecule could carry a vast amount of hereditary information in its A sequence of bases. B phosphate-sugar backbones. C complementary pairing of bases. D side groups of nitrogenous bases. E different five-carbon sugars. ____ 21. In an analysis of the nucleotide composition of DNA, which of the following is true ? A A = C B A = G and C = T C A + C = G + T D G + A = T + C E both C and D ____ 22. Which of the following statements is false when comparing prokaryotes with eukaryotes? A The prokaryotic chromosome is circular, whereas eukaryotic chromosomes are linear. B Prokaryotic chromosomes have a single origin of replication, whereas eukaryotic chromosomes have many. C The rate of elongation during DNA replication is higher in prokaryotes than in eukaryotes. D Prokaryotes produce Okazaki fragments during DNA replication, but eukaryotes do not. E Eukaryotes have telomeres, and prokaryotes do not. ____ 23. The strands that make up DNA are antiparallel. This means that A the twisting nature of DNA creates nonparallel strands. B the 5' to 3' direction of one strand runs counter to the 5' to 3' direction of the other strand. C base pairings create unequal spacing between the two DNA strands.
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  • Spring '10
  • Huntley
  • Biology, DNA, DNA Damage, Colin MacLeod D. Erwin Chargaff E. Matthew Meselson, Stahl Watson, Martha Chase C. Oswald Avery

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