Deck 20: Medical Microbiology

Question 1

What term is used to describe the scientific study of microorganisms and their activities?

A)Parasitology
B)Histology
C)Microbiology
D)Pathology

Answer 1

Microbiology

Question 2

Which of the following procedures requires the use of the oil immersion objective?

A)Examination of a wet mount
B)Examination of a Gram-stained smear
C)Bacitracin susceptibility testing
D)Examination of urine sediment

Answer 2

Examination of a Gram-stained smear

Question 3

The period of time in which the first symptoms indicating an approaching disease occur is known as the _____ period.

A)convalescent
B)acute
C)prodromal
D)symptomatic

Answer 3

prodromal

Question 4

Which of the following microscopes has adjustment knobs that allow movement of the slide in a vertical or horizontal position?

A)Monocular microscope
B)Compound microscope
C)Mechanical stage microscope
D)Binocular microscope

Question 5

Streptococci cause all of the following conditions except

A)scarlet fever.
B)streptococcal sore throat.
C)rheumatic fever.
D)tuberculosis.

Question 6

What name is given to round bacteria growing in pairs?

A)Bacilli
B)Diplococci
C)Staphylococci
D)Streptococci

Question 7

All of the following are natural defense mechanisms of the body except

A)phagocytosis by white blood cells.
B)the skin.
C)antibiotics.
D)antibodies.

Question 8

The transfer of pathogens on a fine spray of moisture droplets is known as

A)droplet infection.
B)susceptibility.
C)indirect transfer.
D)inoculation.

Question 9

All of the following are used to identify a pathogen except

A)sensitivity testing.
B)microbial culture.
C)biochemical tests.
D)microscopy.

Question 10

Escherichia coli normally reside in the

A)vagina.
B)urinary tract.
C)large intestine.
D)stomach.

Question 11

Which of the following diseases is not caused by a virus?

A)Chickenpox
B)Tetanus
C)Mumps
D)Rubella

Question 12

The invasion of the body by a pathogenic microorganism is known as

A)inflammation.
B)infection.
C)disease.
D)susceptibility.

Question 13

A disease that can be spread from one person to another is known as

A)an infectious disease.
B)a contagious disease.
C)an acute disease.
D)droplet infection.

Question 14

Microorganisms that reside in the body but do not cause disease are known as

A)transient flora.
B)normal flora.
C)extraneous microorganisms.
D)staphylococci.

Question 15

The high-power objective has a magnification of

A)10´.
B)40´.
C)60´.
D)100´.

Question 16

Conditions caused by Staphylococcus aureus include

A)boils.
B)wound infections.
C)food poisoning.
D)abscesses.
E)all of the above.

Question 17

Which of the following parts of a microscope is used for precise focusing?

A)Iris diaphragm
B)Coarse adjustment
C)Substage condenser
D)Fine adjustment

Question 18

Syphilis is caused by a

A)spirochete.
B)bacillus.
C)Streptococcus.
D)Diplococcus.

Question 19

What name is given to the interval of time between the invasion by a pathogen and the appearance of the first symptoms of the disease?

A)Prodromal period
B)Infectious period
C)Inoculation
D)Incubation period

Question 20

Staphylococcal infections usually result in which of the following?

A)Gangrene
B)Petechiae
C)Pus formation
D)Maculopapular vesicles

Question 21

A throat specimen is collected to perform tests to assist in the diagnosis of

A)streptococcal sore throat.
B)tetanus.
C)staphylococcal food poisoning.
D)infectious mononucleosis.
E)all of the above.

Question 22

Which of the following could result in the medical assistant becoming infected with a pathogen?

A)Eating while testing a microbiologic specimen
B)Licking a label for a specimen container
C)Having an open sore on the hand
D)Drinking coffee in the office laboratory
E)All of the above

Question 23

Which of the following is a sequela to streptococcal sore throat?

A)Diphtheria
B)Rheumatic fever
C)Pertussis
D)Viral pneumonia

Question 24

Which of the following is not a guideline for the proper care of a microscope?

A)Carry the microscope with two hands.
B)Store the microscope with the nosepiece rotated to the low-power objective.
C)Clean the enameled surface of the microscope with soap and water.
D)Clean the lenses of the microscope with gauze or tissue.

Question 25

The causative agent of gonorrhea is a gram-

A)negative Diplococcus.
B)positive rod.
C)positive Diplococcus.
D)negative Coccus.

Question 26

What is a culture?

A)A mixture of nutrients on which microorganisms are grown in the laboratory
B)A small sample taken to show the nature of the whole
C)Material spread on a slide for microscopic examination
D)A mass of microorganisms growing in a laboratory culture medium

Question 27

What is a smear?

A)Material spread on a slide for microscopic examination
B)A small sample taken to represent the nature of the whole
C)A mass of microorganisms growing in a laboratory culture medium
D)A small piece of cotton wrapped around the end of a wooden stick

Question 28

Which of the following is used to examine microorganisms in the living state?

A)Wet mount
B)Gram staining
C)Smear
D)Rapid strep test

Question 29

The purpose of sensitivity testing is to

A)identify the type of microorganism present.
B)produce a pure culture.
C)determine the best antibiotic to use to treat the condition.
D)determine the effectiveness of drug therapy.
E)achieve all of the above.

Question 30

A throat specimen should be collected from the

A)tonsillar area and posterior pharynx.
B)posterior pharynx.
C)adenoids.
D)hard palate.

Question 31

Which of the following microorganisms is identified by observing its motility under the microscope?

A)Candida albicans
B)Trichomonas vaginalis
C)Treponema pallidum
D)Neisseria gonorrheae

Question 32

The purpose of incubating a culture is to

A)allow the pathogen to grow and multiply.
B)prevent overgrowth of the specimen with extraneous microorganisms.
C)produce a pure culture.
D)kill any pathogens present.

Question 33

When viewed under a microscope,gram-positive bacteria

A)appear pink or red.
B)exhibit motility.
C)appear purple.
D)sing America the Beautiful.

Question 34

If the pathogen were sensitive to an antibiotic,what would be observed when using the disc diffusion method of sensitivity testing?

A)Bacterial growth around the disc
B)Overgrowth of the disc with bacteria
C)A change in color of the disc
D)A clear zone without bacterial growth around the disc

Question 35

Which of the following represents a violation of technique when collecting a throat specimen?

A)Using a sterile swab to collect the specimen
B)Touching the inside of the mouth with the swab
C)Using a rotating motion to collect the specimen
D)Labeling the specimen container

Question 36

The purpose of using transport media is to

A)preserve a specimen in its original state until it reaches its destination.
B)keep the specimen at its optimal growth temperature.
C)reduce the number of pathogens in the specimen.
D)provide nutrients for the multiplication of the specimen.
E)do all of the above.

Question 37

A specimen taken for microbiologic examination must not become contaminated with extraneous microorganisms because the extraneous microorganisms may

A)change the pH of the specimen.
B)alter the morphology of the pathogens.
C)prevent visualization of the pathogen.
D)result in the death of any pathogens present.

Question 38

To view bacteria present on a smear,it first must be

A)stained with an appropriate dye.
B)immersed in alcohol for 15 to 20 minutes.
C)incubated for 24 hours.
D)allowed to air dry for 10 minutes.

Question 39

A microbiologic specimen may be obtained from the

A)throat.
B)nose.
C)wounds.
D)vagina.
E)All of the above are correct.

Question 40

A mixed culture is a culture that

A)contains only one kind of microorganism.
B)contains two or more kinds of microorganisms.
C)contains nutrient agar.
D)has become contaminated with nonpathogens.