Test Bank For Infection Control and Management of Hazardous Materials for the Dental Team 5th Edition by Chris H. Miller

Chapter 2: Characteristics of Microorganisms

Test Bank

MULTIPLE CHOICE

1. Regular bacteria, excluding Rickettsia and Chlamydia, multiply:

A.	in the absence of nutrients.
B.	only when they are inside of living cells.
C.	when they are outside of living cells.
D.	only when the temperature is below 7° C.

ANS: C

	Feedback
A	Nothing can grow in the absence of nutrients.
B	Rickettsia and Chlamydia are the only bacteria that can grow inside living cells.
C	Regular bacteria do not need to be inside living cells to grow. They can obtain their nutrients from the environment.
D	Only the special bacteria called psychrophiles can grow at these low temperatures.

REF: Culturing Bacteria, page 13 OBJ: 2

2. Viruses multiply:

A.	in the absence of nutrients.
B.	only when they are inside of living cells.
C.	when they are outside of living cells.
D.	only when the temperature is below 7° C.

ANS: B

	Feedback
A	Nothing can grow in the absence of nutrients.
B	Viruses need the nutrients and metabolic machinery of living cells to multiply.
C	Viruses cannot obtain their nutrients from the environment.
D	Only the special bacteria called psychrophiles can grow at these low temperatures.

REF: Life Cycle, page 15 OBJ: 5

3. Which of the following microbes is a yeast?

A.	Streptococcus mutans
B.	Trichomonas vaginalis
C.	Candida albicans
D.	Staphylococcus aureus

ANS: C

	Feedback
A	This is a bacterium.
B	This is a protozoan.
C	Candida albicans can exist as a yeast, which is a special fungus.
D	This is a bacterium.

REF: Fungi, page 16 OBJ: 6

4. Which of the following microbes is a type of fungus?

A.	Influenzae
B.	Candida albicans
C.	Trichomonas vaginalis
D.	Streptococcus mutans

ANS: B

	Feedback
A	This is a virus.
B	Candida albicans can exist as a yeast or filamentous fungus.
C	This is a protozoan.
D	This is a bacterium.

REF: Fungi, page 16 OBJ: 6

5. A yeast is what type of microorganism?

A.	Bacterium
B.	Fungus
C.	Virus
D.	Protozoan

ANS: B

	Feedback
A	Bacteria cannot form yeast.
B	A yeast is a special type of fungus.
C	A virus cannot form yeasts.
D	Protozoa cannot form yeasts.

REF: Fungi, page 16 OBJ: 6

6. Thrush is caused by:

A.	Candida albicans.
B.	Streptococcus mutans.
C.	Staphylococcus aureus.
D.	human herpesvirus 1.

ANS: A

	Feedback
A	Oral candidiasis (e.g., thrush or denture stomatitis) is caused by the fungus Candida albicans, which may exist as a yeast cell or as a filamentous fungus (mold).
B	Oral candidiasis (e.g., thrush or denture stomatitis) is caused by the fungus Candida albicans, which may exist as a yeast cell or as a filamentous fungus (mold).
C	Oral candidiasis (e.g., thrush or denture stomatitis) is caused by the fungus Candida albicans, which may exist as a yeast cell or as a filamentous fungus (mold).
D	Oral candidiasis (e.g., thrush or denture stomatitis) is caused by the fungus Candida albicans, which may exist as a yeast cell or as a filamentous fungus (mold).

REF: Fungi, page 16 OBJ: 6

7. Bacilli are shaped like:

A.	spheres.
B.	cylinders or rods.
C.	curved or spiral forms.
D.	flat disks.

ANS: B

	Feedback
A	Spheres are not bacilli.
B	Bacilli are bacterial cells shaped like rods or cylinders.
C	Spirilla are curved or spiral forms.
D	There are no microbes shaped like a flat disk.

REF: Size and Shape, page 8 OBJ: 1

8. Cocci are shaped like:

A.	spheres.
B.	cylinders or rods.
C.	curved or spiral forms.
D.	flat disks.

ANS: A

	Feedback
A	Spherical cells are called cocci.
B	Rod-shaped cells are called bacilli.
C	Curved or spiral cells are called spirilla.
D	This is not a shape associated with bacteria.

REF: Size and Shape, page 8 OBJ: 1

9. Which of the following bacterial structures controls the flow of nutrients and waste into and out of the cell?

A.	Cell wall
B.	Flagellum
C.	Cytoplasmic membrane
D.	Capsule

ANS: C

	Feedback
A	The cell wall protects the cell from being crushed.
B	The flagellum provides locomotion.
C	One of the functions of the cytoplasmic membrane is to regulate the entrance and exit of nutrient materials and waste products.
D	The capsule keeps the cell from drying out and is antiphagocytic.

REF: Cytoplasmic Membrane, page 8 OBJ: 1

10. Which of the following bacterial structures interferes with phagocytosis?

A.	Cell wall
B.	Flagellum
C.	Cytoplasmic membrane
D.	Capsule

ANS: D

	Feedback
A	The cell wall protects the cell from being crushed.
B	The flagellum provides locomotion.
C	One of the functions of the cytoplasmic membrane is to regulate the entrance and exit of nutrient materials and waste products.
D	The capsule’s “slimy” nature interferes with phagocytosis.

REF: Capsule, page 10 OBJ: 1

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