TEST B
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,Chapter 01: Scope of Microbiology and Infection Control
Miller: Infection Control and Management of Hazardous Materials for the Dental
Team, 7th Edition
MULTIPLE CHOICE
1. Who is reported to have first observed microbes?
a. Pasteur
b. Oliver Wendell Holmes
c. Lister
d. Leeuwenhoek
ANS: D
Pasteur, Oliver Wendell Holmes, and Lister made other important contributions to
microbiology. Leeuwenhoek first observed microbes and called them “animalcules.”
PTS: 1 DIF: Recall REF: p. 2 OBJ: 2
TOP: CDA, Infection Control, Does not apply
2. What year were microbes first observed?
a. 1667
b. 1880
c. 1956
d. 1975
ANS: A
Leeuwenhoek first observed microbes and called them “animalcules” in 1667, 1880, 1956,
and 1975 are all too recent.
PTS: 1 DIF: Recall REF: p. 2 OBJ: 2
TOP: CDA, Infection Control, Does not apply
3. Choose the microbial killing method referred to as pasteurization.
a. 121C for 20 minutes
b. 212F for 5 minutes
c. 63C for 30 minutes
d. 37C for 10 minutes
ANS: C
121C for 20 minutes achieves sterilization. 212F for 5 minutes is the temperature of
boiling water. 63C for 30 minutes achieves pasteurization which kills harmful microbes
in liquids such as milk. 37C for 10 minutes is body temperature.
PTS: 1 DIF: Application REF: p. 2 OBJ: 2
TOP: CDA, Infection Control, III.A. Instrument/device processing
4. When was the “Golden Age of Microbiology”?
a. Mid to late 1600s
b. Mid to late 1700s
c. Mid to late 1800s
, d. Mid to late 1900s
ANS: C
Mid to late 1600s and mid to late 1700s were too early. Mid to late 1800s was the time
when many new discoveries in microbiology were made. Mid to late 1900s was too late.
PTS: 1 DIF: Recall REF: p. 2 OBJ: 2
TOP: CDA, Infection Control, Does not apply
5. What microbes are used to make vinegar, vitamins, drain cleaners, enzymes, and other
products?
a. Fungi
b. Viruses
c. Protozoa
d. Bacteria
ANS: D
Fungi can make antibiotics but not these products. Viruses grow inside living cells and do
not make such products. Protozoa are not very efficient in making such products. Bacteria
make these and other products when they are grown in large vats.
PTS: 1 DIF: Recall REF: p. 3 OBJ: 3
TOP: CDA, Infection Control, Does not apply
6. Which microbes are used to make pickles out of cucumbers?
a. Bacteria or fungi
b. Fungi or viruses
c. Viruses or yeasts
d. Bacteria of viruses
ANS: A
Bacteria or fungi make certain extracellular products that change cucumbers into pickles.
Viruses do not produce products that affect cucumbers.
PTS: 1 DIF: Recall REF: p. 3 OBJ: 3
TOP: CDA, Infection Control, Does not apply
7. What microbe is used to make bread dough rise?
a. Bacteria
b. Yeasts
c. Viruses
d. Protozoa
ANS: B
Bacteria do not produce enough carbon dioxide (CO2) to make the dough rise. Yeasts
metabolize carbohydrates to produce the gas bubbles of CO2 which causes the dough to
rise. Viruses only grow inside of living cells and do not have a regular metabolism.
Protozoa do not produce enough carbon dioxide (CO2) to make the dough rise.
PTS: 1 DIF: Recall REF: p. 3 OBJ: 3
TOP: CDA, Infection Control, Does not apply
