Rasmussen MCB2289 Module 7 LAB Quiz Question # 00601477 Subject: Education Due on: 05/20/2019 Posted On: 05/20/2019 03:52 AM Tutorials: 1 Rating: 4.9/5

• 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

False