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Question 1
The _________ test involves using rabbit plasma as a reagent and its results are determined by observation of thickening of the medium.
Answers: Catalase
Oxidase
Coagulase
Peroxidase
Question 2
Gram-positive cocci in chains would be called staphylococci.
Answers: True
False
Question 3
Which of the following bacterial species would be most likely to grow in bile esculin medium and hydrolyze the esculin?
Answers:
Enterococcus faecalis
Streptococcus pneumoniae
Staphylococcus aureus
Staphylococcus epidermidis
Question 4
Identification of a bacterial species cannot be made on microscopic morphology alone because __________.
Answers: Bacterial shapes are usually variable and are not a reliable characteristic for identification
Many organisms have a similar microscopic morphology
Staining reactions are variable and not a reliable characteristic
Staining and microscopic observation is too time-consuming for routine use
Question 5
The absence of hemolysis on a blood agar plate is referred to as _______ hemolysis
Answers: Alpha
Beta
Gamma
Delta
Question 6
Which of the following is a characteristic of members of the resident microbiota?
Answers:
Resident microbiota can compete with and limit growth of harmful bacteria.
Resident microbiota are a major source of nutrients for our body.
Resident microbiota typically cause serious infections.
Resident microbiota often initiate allergic reactions.
Question 7
When a large zone of no growth is found around an antibiotic disc being used for identification purposed, this generally means that the microbe is ______ to the antibiotic
Answers: Resistant
Pathogenic
Sensitive
Neutral
Question 8
All of the following infections are frequently cause by Staphylococcus and Streptococcus species EXCEPT?
Answers: Endocarditis
Abscess
Diarrhea
Pneumonia
Question 9
Which test uses a medium that is both selective and differential for members of the genus Staphylococcus?
Answers: MacConkey agar
Mannitol Salt agar
Coagulase test
Bile esculin hydrolysis
Question 10
All of the following are methods that can be used to isolate bacteria from a mixed culture EXCEPT?
Answers: Streak plating
Loop dilution pour plating
Gram staining
Serial dilution followed by spread plating
Question 11
How do you determine the species of an unknown bacterium?
Answers: You should make a careful investigation of the morphology of the bacterial cells using a microscope to make a firm identification.
You need to quantify the number of bacteria in the same to determine the species.
Identification can only be made based on the patient’s signs and symptoms.
You use standard tests and pre-existing knowledge to classify the bacterium.
Question 12
All of the following body sites normally have large numbers of resident microbiota EXCEPT?
Answers: Nose
Large intestine
Skin
Blood
Question 13
The field of study in which medicine and microbiology intersect is known as medical microbiology
Answers: True
False
Question 14
A microorganisms that is most often harmless but may occasionally cause infection and disease if defenses are compromised is referred to as an opportunistic pathogen.
Answers: True
False
Question 15
Which test utilizes hydrogen peroxide and the observation of gas bubble formation when attempting to identify an unknown bacterium?
Answers: Bile esculin hydrolysis
Coagulase test
Oxidase test
Catalase test
Question 16
A bacterial isolate grown on a mannitol salt agar plate changes the pink agar to yellow and produces bright yellow colonies. This indicates that the isolate is _______ for mannitol fermentation.
Answers: Negative
Positive
Question 17
Impetigo, a type of inflammatory skin infection, is caused by__________
Answers: Enterococcus faecalis
Streptococcus pneumoniae
Staphylococcus aureus
E. coli
Question 18
The complete clearing or hemolysis that a bacterial isolate may produce on blood agar is called alpha hemolysis
Answers: True
False
Question 19
The Gram stain is an example of a test that can be used to determine the ______ characteristics of a bacterium?
Answers: Physiological
Genetic
Morphological
Culturing
Question 20
Before attempting to identify an unknown bacterial species, the organism must be isolated in a pure culture.
Answers: True