MCQ Microbiology
MCQ Control of Microbial Growth
1. Which of the following types of medical items requires sterilization?
a) needles
b) bed linens
c) respiratory masks
d) blood pressure cuffs
2. Which of the following is suitable for use on tissues for microbial control to prevent infection?
a) disinfectant
b) antiseptic
c) sterilant
d) water
3. Which biosafety level is appropriate for research with microbes or infectious agents that pose moderate risk to laboratory workers and the community, and are typically indigenous?
a) BSL-1
b) BSL-2
c) BSL-3
d) BSL-4
4. Which of the following best describes a microbial control protocol that inhibits the growth of molds and yeast?
a) bacteriostatic
b) fungicidal
c) bactericidal
d) fungistatic
5. The decimal reduction time refers to the amount of time it takes to which of the following?
a) reduce a microbial population by 10%
b) reduce a microbial population by 0.1%
c) reduce a microbial population by 90%
d) completely eliminate a microbial population
6. Which of the following methods brings about cell lysis due to cavitation induced by rapid localized pressure changes?
a) microwaving
b) gamma irradiation
c) ultraviolet radiation
d) sonication
7. Which of the following terms is used to describe the time required to kill all of the microbes within a sample at a given temperature?
a) D-value
b) thermal death point
c) thermal death time
d) decimal reduction time
8. Which of the following microbial control methods does not actually kill microbes or inhibit their growth but instead removes them physically from samples?
a) filtration
b) desiccation
c) lyophilization
d) nonionizing radiation
9. Which of the following refers to a disinfecting chemical dissolved in alcohol?
a) iodophor
b) tincture
c) phenolic
d) peroxygen
10. Which of the following peroxygens is widely used as a household disinfectant, is inexpensive, and breaks down into water and oxygen gas?
a) hydrogen peroxide
b) peracetic acid
c) benzoyl peroxide
d) ozone
11. Which of the following chemical food preservatives is used in the wine industry but may cause asthmatic reactions in some individuals?
a) nitrites
b) sulfites
c) propionic acid
d) benzoic acid
12. Bleach is an example of which group of chemicals used for disinfection?
a) heavy metals
b) halogens
c) quats
d) bisbiguanides
13. Which chemical disinfectant works by methylating enzymes and nucleic acids and is known for being toxic and carcinogenic?
a) sorbic acid
b) triclosan
c) formaldehyde
d) hexaclorophene
14. Which type of test is used to determine whether disinfectant solutions actively used in a clinical setting are being used correctly?
a) disk-diffusion assay
b) phenol coefficient test
c) in-use test
d) use-dilution test
15. The effectiveness of chemical disinfectants has historically been compared to that of which of the following?
a) phenol
b) ethyl alcohol
c) bleach
d) formaldehyde
16. Which of the following refers to a germicide that can kill vegetative cells and certain enveloped viruses but not endospores?
a) high-level germicide
b) intermediate-level germicide
c) low-level germicide
d) sterilant
