39. What is generally added to wine as a preservative? C. nitrites D. sulphates

Question

39. What is generally added to wine as a preservative? C. nitrites D. sulphates (SO2) E. tetracycline 40. Which of the following inhibit DNA fyrase and block bacterial DNA synthesis? A. penicillin B. ciprofloxacin D, tetracycline 41. The following reaction 2Hzo O2Hzo O2 is catalyzed by: hydrogen peroxide diintegrasp B. oxygen Roovettase C. catalase superoxide dismutasc E. hydrogen oxide reductase 42, Which of the following block protein synthesis by causing RNA misread during protein synthesis? A. vancomycin B. ciprofloxacin C. rifampin aminoglycosides 43. Which of the following block peptidoglycan elongation? A. aminoglycosides B. vancomycin D. erythromycin E. streptomycin 44. Which of the following block protein synthesis by inhibiting the function of the3 50s subunit ofribosomes? C. Augmentin E. vancomycin 45. Which of the following is NOT true about the lac operon? A. The genes that metabolize lactose are adjacent to one another and are transcribed together B. Allolassose binds to the repressor molecule and cause the repressor to fall off from the operator sequence C. The lac genes are expressed all the time even when lactose is absent D. RNA polymerase binds to the promoter and cause transcription of the lac genes E. All of the above are TRUE 46. Which of the following block RNA synthesis by blocking the action of bacterial RNA polymerase? penicillin B. rifampin

Explanation / Answer

Answer

39. B sulphites

40. B ciprofloxacin

41. C catalase

42. E

43. B

44. D

45. C

46. B

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