Which one of the following is most resistant to chemical biocides?

Which one of the following is most resistant to chemical biocides? 

A) gram-negative bacteria
B) gram-positive bacteria
C) mycobacteria
D) protozoan cysts
E) viruses with lipid envelopes


Answer: a

Bone and tendons for transplant are decontaminated by

Bone and tendons for transplant are decontaminated by 

A) ethylene oxide.
B) glutaraldehyde.
C) peroxygens.
D) plasma sterilization.
E) supercritical fluids.


Answer: e

If you were preparing nutrient agar at home and did not have an autoclave, what could you use to sterilize the nutrient agar?

If you were preparing nutrient agar at home and did not have an autoclave, what could you use to sterilize the nutrient agar?

A) bleach
B) boiling for one hour
C) hydrogen peroxide
D) oven at 121°C for one hour
E) pressure cooker at 121°C for 15 minutes


Answer: e

The preservation of beef jerky from microbial growth relies on which method of microbial control?

The preservation of beef jerky from microbial growth relies on which method of microbial control?

A) filtration
B) lyophilization
C) desiccation
D) ionizing radiation
E) supercritical CO2


Answer: c

All of the following are methods of food preservation EXCEPT

All of the following are methods of food preservation EXCEPT

A) desiccation.
B) high pressure.
C) ionizing radiation.
D) microwaves.
E) osmotic pressure.


Answer: d

Which of the following pairs is mismatched?

Which of the following pairs is mismatched?

A) ionizing radiation — hydroxyl radicals
B) ozone — takes electrons from substances
C) plasma sterilization — free radicals
D) supercritical fluids — CO2
E) ultraviolet radiation — desiccation


Answer: e

All of the following are effective for destroying prions EXCEPT

All of the following are effective for destroying prions EXCEPT

A) boiling.
B) incineration.
C) NaOH + autoclaving at 134°C.
D) proteases.
E) None of the answers are correct; each of these will destroy prions.


Answer: a

In Table 7.3, which disinfectant was most effective against Salmonella?

In Table 7.3, which disinfectant was most effective against Salmonella?

A) Doom
B) K.O.
C) Mortum
D) Sterl
E) The answer cannot be determined based on the information provided.


Answer: e

In Table 7.3, which disinfectant was bactericidal?

In Table 7.3, which disinfectant was bactericidal?

A) Doom
B) K.O.
C) Mortum
D) Sterl
E) The answer cannot be determined based on the information provided.


Answer: c

In Table 7.3, which disinfectant is the most effective at stopping bacterial growth?

In Table 7.3, which disinfectant is the most effective at stopping bacterial growth?

A) Doom
B) K.O.
C) Mortum
D) Sterl
E) The answer cannot be determined based on the information provided.


Answer: a

All of the following substances are used to preserve foods EXCEPT

All of the following substances are used to preserve foods EXCEPT

A) biguanides.
B) nisin.
C) potassium sorbate.
D) sodium nitrite.
E) calcium propionate.


Answer: a

Ethylene oxide

Ethylene oxide

A) is a good antiseptic.
B) is not sporicidal.
C) requires high heat to be effective.
D) is a sterilizing agent.
E) is the active chemical in household bleach.


Answer: d

An iodophor is a(n)

An iodophor is a(n) 

A) phenol.
B) agent that reduces oxygen.
C) quaternary ammonium compound.
D) form of formaldehyde.
E) iodine mixed with a surfactant.


Answer: e

Which graph in Figure 7.2 best depicts the effect of placing the culture at 7°C at time x?

Which graph in Figure 7.2 best depicts the effect of placing the culture at 7°C at time x?

A) a
B) b
C) c
D) d
E) e


Answer: d

Which graph in Figure 7.2 best depicts the effect of placing the culture in an autoclave for 15 minutes at time x?

Which graph in Figure 7.2 best depicts the effect of placing the culture in an autoclave for 15 minutes at time x?

A) a
B) b
C) c
D) d
E) e


Answer: b

Which of the following pairs is mismatched?

Which of the following pairs is mismatched?

A) Ag — wound dressings
B) alcohols — open wounds
C) CuSO4 — algicide
D) H2O2 — open wounds
E) organic acids — food preservation


Answer: b

Which of the following results in lethal damage to nucleic acids?

Which of the following results in lethal damage to nucleic acids?

A) heat
B) radiation
C) certain chemicals
D) heat and radiation
E) heat, radiation, and some chemicals


Answer: e

Which of the following regarding antimicrobial control agents is FALSE?

Which of the following regarding antimicrobial control agents is FALSE?

A) Contaminating organic debris such as blood or sputum will decrease effectiveness.
B) Some agents kill by denaturing microbial cell proteins.
C) Some agents affect microbial cell membranes by dissolving lipids.
D) Some agents are utilized as both an antiseptic and a disinfectant.
E) A true antimicrobial control agent is equally effective against both bacteria and viruses.


Answer: e

Which of the following could be used to sterilize plastic Petri plates in a plastic wrapper?

Which of the following could be used to sterilize plastic Petri plates in a plastic wrapper?

A) autoclave
B) gamma radiation
C) microwaves
D) sunlight
E) ultraviolet radiation


Answer: b

Which of the following treatments is the most effective for controlling microbial growth?

Which of the following treatments is the most effective for controlling microbial growth?

A) 63°C for 30 minutes
B) 72°C for 15 seconds
C) 140°C for 4 seconds
D) They are equivalent treatments.
E) None of the answers is correct.


Answer: d