Chapter 7 The Control of Microbial Growth

1. Chapter 7 – The Control of Microbial Growth

2. Topic 1: Terminology $100 Question The removal or destruction of all forms of microbial life is called a. Sterilization b. Disinfection c. Pasteurization d. Sanitization

3. Topic 1: Terminology $100 Answer The removal or destruction of all forms of microbial life is called a. Sterilization (correct answer) b. Disinfection c. Pasteurization d. Sanitization

4. Topic 1: Terminology $200 Question The destruction of vegetative pathogens is called a. Sanitization b. Commercial sterilization c. Disinfection d. Antisepsis

5. Topic 1: Terminology $200 Answer The destruction of vegetative pathogens is called a. Sanitization b. Commercial sterilization c. Disinfection (correct answer) d. Antisepsis

6. Topic 1: Terminology $300 Question Treatment intended to lower microbial counts on eating and drinking utensils to safe public health levels: a. Sanitization b. Sterilization c. Pasteurization d. Antisepsis

7. Topic 1: Terminology $300 Answer Treatment intended to lower microbial counts on eating and drinking utensils to safe public health levels: a. Sanitization (correct answer) b. Sterilization c. Pasteurization d. Antisepsis

8. Topic 1: Terminology $400 Question The absence of significant contamination is called a. Sepsis b. Bacteriostasis c. Asepsis d. Antisepsis

9. Topic 1: Terminology $400 Answer The absence of significant contamination is called a. Sepsis b. Bacteriostasis c. Asepsis (correct answer) d. Antisepsis

10. Topic 1: Terminology $500 Question Commercial sterilization is a limited heat treatment to destroy a. Streptococcus pyogenes b. Clostridium tetani c. Staphylococcus aureus d. Clostridium botulinum endospores

11. Topic 1: Terminology $500 Answer Commercial sterilization is a limited heat treatment to destroy a. Streptococcus pyogenes b. Clostridium tetani c. Staphylococcus aureus d. Clostridium botulinum endospores(correct answer)

12. Topic 2: Rate of Microbial Death $100 Question Which of the following BEST describes the pattern of microbial death? a. The cells in a population die at a constant rate b. All the cells in a culture die at once c. Not all of the cells in a culture are killed d. The pattern varies, depending on the species

13. Topic 2: Rate of Microbial Death $100 Answer Which of the following BEST describes the pattern of microbial death? a. The cells in a population die at a constant rate (correct answer) b. All the cells in a culture die at once c. Not all of the cells in a culture are killed d. The pattern varies, depending on the species

14. Topic 2: Rate of Microbial Death $200 Question The time it takes to kill a microbial population is a. Dependent on heat b. Proportional to the number of microbes c. Dependent on life cycle phases d. Dependent on chemicals

15. Topic 2: Rate of Microbial Death $200 Answer The time it takes to kill a microbial population is a. Dependent on heat b. Proportional to the number of microbes (answer) c. Dependent on life cycle phases d. Dependent on chemicals

16. Topic 2: Rate of Microbial Death $300 Question The lowest temperature at which all of the microorganisms in a particular liquid suspension will be killed in 10 minutes is called a. Thermal death point b. Thermal death time c. Decimal reduction time d. Decimal reduction point

17. Topic 2: Rate of Microbial Death $300 Answer The lowest temperature at which all of the microorganisms in a particular liquid suspension will be killed in 10 minutes is called a. Thermal death point (correct answer) b. Thermal death time c. Decimal reduction time d. Decimal reduction point

18. Topic 2: Rate of Microbial Death $400 Question Which of the following is the MOST resistant to chemical biocides? a. Prions b. Gram-positive bacteria c. Viruses without envelopes d. Vegetative protozoa

19. Topic 2: Rate of Microbial Death $400 Answer Which of the following is the MOST resistant to chemical biocides? a. Prions (correct answer) b. Gram-positive bacteria c. Viruses without envelopes d. Vegetative protozoa

20. Topic 2: Rate of Microbial Death $500 Question Which one of the following is the BEST advertisement for a disinfectant? a. Kills Gram Negative Bacteria b. Kills Gram Positive Bacteria c. Kills Strong Gram Negative d. Kills viruses with lipids

21. Topic 2: Rate of Microbial Death $500 Answer Which one of the following is the BEST advertisement for a disinfectant? a. Kills E. coli b. Kills Staphylococcus aureus c. Kills Pseudomonas (correct answer) d. Kills lipophilic viruses

22. Topic 3: Physical Methods$100 Question To sterilize heat-sensitive solutions, one should use a. Dry heat b. Autoclave c. Membrane filtration d. Pasteurization

23. Topic 3: Physical Methods $100 Answer To sterilize heat-labile solutions, one should use a. Dry heat b. Autoclave c. Membrane filtration (correct answer) d. Pasteurization

24. Topic 3: Physical Methods $200 Question Which method kills microorganisms primarily by the coagulation of proteins (denaturation)? a. Filtration b. Radiation c. Desiccation d. Moist heat

25. Topic 3: Physical Methods $200 Answer Which method kills microorganisms primarily by the coagulation of proteins (denaturation)? a. Filtration b. Radiation c. Desiccation d. Moist heat (correct answer)

26. Topic 3: Physical Methods $300 Question The phosphatase test is used to determine whether which one of the following processes was carried out correctly? a. Radiation b. Filtration c. Desiccation d. Pasteurization

27. Topic 3: Physical Methods $300 Answer The phosphatase test is used to determine whether which of the following processes was carried out correctly? a. Radiation b. Filtration c. Desiccation d. Pasteurization (correct answer)

28. Topic 3: Physical Methods $400 Question Flaming is one of the simplest methods of a. Pasteurization b. Dry heat sterilization c. Moist heat d. Desiccation

29. Topic 3: Physical Methods $400 Answer Flaming is one of the simplest methods of a. Pasteurization b. Dry heat sterilization (correct answer) c. Moist heat d. Desiccation

30. Topic 3: Physical Methods $500 Question Which of the following methods causes destruction of DNA? a. Radiation b. Osmotic pressure c. Heat d. Desiccation

31. Topic 3: Physical Methods $500 Answer Which of the following methods causes destruction of DNA? a. Radiation (correct answer) b. Osmotic pressure c. Heat d. Desiccation

32. Topic 4: Chemical Methods$100 Question Sterilization can be achieved by using a. Alcohol b. Soap c. Chlorine d. Ethylene oxide

33. Topic 4: Chemical Methods $100 Answer Sterilization can be achieved by using a. Alcohol b. Soap c. Chlorine d. Ethylene oxide (correct answer)

34. Topic 4: Chemical Methods $200 Question Which of the following substances is the LEAST effective antimicrobial agent? a. Soap b. Phenolics c. Iodine d. Alcohol

35. Topic 4: Chemical Methods $200 Answer Which of the following substances is the LEAST effective antimicrobial agent? a. Soap (correct answer) b. Phenolics c. Iodine d. Alcohol

36. Topic 4: Chemical Methods $300 Question The eradication of nonenveloped viruses CANNOT be achieved by a. Chlorine b. Ozone c. Alcohol d. Ethylene oxide

37. Topic 4: Chemical Methods $300 Answer The eradication of nonenveloped viruses CANNOT be achieved by a. Chlorine b. Ozone c. Alcohol (correct answer) d. Ethylene oxide

38. Topic 4: Chemical Methods $400 Question Ethanol can be used as an effective bactericide when used at a concentration of a. 70% b. 50% c. 40% d. 100%

39. Topic 4: Chemical Methods $400 Answer Ethanol can be used as an effective bactericide when used at a concentration of a. 70% (correct answer) b. 50% c. 40% d. 100%

40. Topic 4: Chemical Methods $500 Question Which of the following is NOT used to preserve foods? a. Nisin b. Sodium nitrite c. Potassium sorbate d. Biguanides

41. Topic 4: Chemical Methods $500 Answer Which of the following is NOT used to preserve foods? a. Nisin b. Sodium nitrite c. Potassium sorbate d. Biguanides (correct answer)

42. Topic 5: Chemical Agents $100 Question Which of the following is the MOST useful for disinfecting medical instruments? a. Quats b. Chlorine c. Phenol d. Benzoic acid

43. Topic 5: Chemical Agents $100 Answer Which of the following is the MOST useful for disinfecting medical instruments? a. Quats (correct answer) b. Chlorine c. Phenol d. Benzoic acid

44. Topic 5: Chemical Agents $200 Question This was first used by Lister to control surgical infections in the operating room a. Alcohol b. Chlorhexidine c. Carbolic acid d. Mercuric chloride

45. Topic 5: Chemical Agents $200 Answer This was first used by Lister to control surgical infections in the operating room a. Alcohol b. Chlorhexidine c. Carbolic acid (correct answer) d. Mercuric chloride

46. Topic 5: Chemical Agents $300 Question These chemical agents cause a disruption of the plasma membrane and denaturation of enzymes: a. Phenolics b. Biguanides c. Alcohols d. Halogens

47. Topic 5: Chemical Agents $300 Answer These chemical agents cause a disruption of the plasma membrane and denaturation of enzymes: a. Phenolics (correct answer) b. Biguanides c. Alcohols d. Halogens

48. Topic 5: Chemical Agents $400 Question These agents cause denaturation of enzymes and other essential proteins: a. Aldehydes b. Heavy metals c. Peroxygens d. Nitrates

49. Topic 5: Chemical Agents$400 Answer These agents cause denaturation of enzymes and other essential proteins: a. Aldehydes b. Heavy metals (correct answer) c. Peroxygens d. Nitrates

50. Topic 5: Chemical Agents $500 Question What chemical is used to prevent molds from growing in cheese and soft drinks? a. Sorbic acid b. Calcium propionate c. Sulfur dioxide d. Sodium nitrate

51. Topic 5: Chemical Agents $500 Answer What chemical is used to prevent molds from growing in cheese and soft drinks? a. Sorbic acid (correct answer) b. Calcium propionate c. Sulfur dioxide d. Sodium nitrate

52. FINAL ROUND Question What chemical selectively inhibits certain iron-containing enzymes of Clostridium botulinum? a. Sodium benzoate b. Sodium nitrate c. Sodium nitrite d. Calcium propionate

53. FINAL ROUND Answer What chemical selectively inhibits certain iron-containing enzymes of Clostridium botulinum? a. Sodium benzoate b. Sodium nitrate c. Sodium nitrite (correct answer) d. Calcium propionate