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• 26. Why does mismatch repair not lead to mutation upon repair of heteroduplex DNA?(A) The incorrect
• 27. Why is transcription-coupled repair (TCR) considered particularly efficient when compared tonucl
• 28. Which of the following eukaryotic recombination proteins is structurally and functionally simila
• 29. Which of the following is NOT a component of the mating-type switch mechanism?(A) HO nuclease (B
• 30. Which one of the following factors significantly contributes to the ability of eukaryotic cells
• 31. Which of the following is NOT a step in non-homologous end joining?(A) Phosphorylation of the Ku
• 32. Salmonella typhimurium can change flagella proteins to evade immune response by host systems.Wha
• 33. Which of the following will NOT result from site-specific recombination?(A) Inversion (B)Deletio
• 34. P1 bacteriophage can be used as an experimental vehicle to move genes from one cell to anotherbe
• 35. Which of the following mechanisms is used by retrotransposons?(A) Cut-and-paste transposition (B
• 36. The processivity of a DNA polymerase depends on all of the following actions, EXCEPT for________
• 37. Which of the following statements correctly describes the role of telomerase in eukaryotic cells
• 38. Which of the following components are required for integration of bacteriophage ~ genome into th
• 39. Upon the initial infection of a host cell by bacteriophage λ, the first two proteins produced fr
• 40. The int/xis encoded enzyme of bacteriophage λ is required to:(A) excise the prophage from the ho
• 41. Ribosomal proteins that can act as translational repressors:(A) are not encoded by the same mRNA
• 42. How does the RecA protein contribute to the increased expression of SOS genes?(A) RecA protein c
• 43.Which of the following is NOT a characteristic of a riboswitch?(A) They are structures that exist
• 44. Which of the following is NOT true of the regulation of the arabinose operon?(A) CRP activates e
• 45. Catabolite repression of the lac operon restricts expression when:(A) glucose is absent. (B) lac
• 46. The binding of______________ to the Lac repressor causes the protein to dissociate from the oper
• 47. Which of the following is NOT true of the imprinting of the mammalian gene for insulin growthfac
• 48. DNA microarrays have made a huge impact on genomic studies because they(A) dramatically enhance
• 49. The upstream activator sequences (UASs) of yeast are analogous to____________ in highereukaryote
• 50. The enzyme that cleaves the mRNA transcript targeted by siRNA is:(A) Drosha. (B) Dicer. (C) Argo