If you were to make a coagulase test, you would add anti-coagulant to prevent: S
ID: 96110 • Letter: I
Question
If you were to make a coagulase test, you would add anti-coagulant to prevent:
Select one:
a. Armageddon
b. False positive results
Which enzyme catalyses the reaction of hydrogen peroxide to water and oxygen gas?
Select one:
a. Oxidase
b. Catalase
c. Alcohol
d. Glucase
e. Hydrogenase
Which one of the following organisms may be presumptively identified by using a coagulase test?
Select one:
a. Bed bugs
b. Staphylococcus aureus
These are chemicals that change or produce color as these become oxidized:
Select one:
a. Chromogenic reducing agents
b. Media
c. ATPs
d. Cytochrome C oxidase
e. ETCs
No color change in the allotted amount of time for the oxidase test suggests:
Select one:
a. Negative result
b. Materials were not sterilized
c. Culture was not pure enough
d. Too much time was allowed
e. Positive result
Catalase test: Which of the following samples used in the slant test would likely produce bubbles?
Select one:
a. More than one of these is likely to produce bubbles
b. Unincoculated control
c. Staphylococcus epidermidis
d. Enterococcus faecalis
Cytochrome C oxidase is an enzyme that:
Select one:
a. Uses ATP in glycolysis
b. Transfers electrons to oxygen
c. Leads to no color change when present
d. Causes false negative results
e. Produces ATP in the Krebs cycle
Catalase test: In the slide test, what does the positive control confirm?
Select one:
a. Quality of your slide
b. Quality of your unknown sample
c. Quality of your hydrogen peroxide
d. Quality of your sterile technique
e. Quality of the agar
Explanation / Answer
1) Coagulase is an enzyme that clts blood plasma. Coagulase test is done to identify hweather the organism produces coagulase enzyme or not. Anti-coagulants like citrate and EDTA are usually added to prevent the occurence of false positive results.
2) The enzyme that catalyses the reaction of hydrogen peroxide to water and oxygen gas is catalase.
3) The organism that may be presumptively identified by using a coagulase test is Staphylococcus aureus.
4) Chemical that change or produce color as they become oxidized is chromogenic reducing agent.