1/ What type of experiment is blood agar generally used for? Select one: a. Asep
ID: 97394 • Letter: 1
Question
1/
What type of experiment is blood agar generally used for?
Select one:
a. Aseptic transfer
b. Staining test
c. Microscopy technique
d. Differential test
e. Quantitative technique
2.
Identification of Gram-positive cocci: A class of microbiology students isolate and identify Gram-positive cocci from throat swabs. Which species do they always assume they have isolated if they have no clue what they are doing?
Select one:
a. Avoid this one
b. Not this answer
c. Staphylococcus aureus (choose this one)
d. This is the wrong answer
3.
What is the minimum zone of inhibition for the bacteria to be considered susceptible to novobiocin?
Select one:
a. 10 mm
b. 14 mm
c. 16 mm
d. 6 mm
e. 1 mm
4.
Why is it important to put the bacitracin disk on the bacteria lawn immediately after spreading the microbes on the plate?
Select one:
a. Doesn't matter, bacitracin is likely to kill the bacteria
b. Bacitracin in bacteriostatic
c. It is just a convienance
d. To get the experiment over with
5.
What is the mechanism of action for optochin?
Select one:
a. Interferes with S. niveus.
b. Interferes with ATPase activity
c. Inhibits cell wall synthesis
d. Inhibits DNA replication
e. Inhibits hemolysis
6.
Why should you stab the agar with your loop after completing the streak?
Select one:
a. To detect beta-hemolysis from oxygen-labile hemolysin
b. To detect Escherichia coli
c. To detect Pseudomonads
d. To make sure it is dead
e. To oxygenate the agar
7.
When hemolysins are present on a blood agar plate, they:
Select one:
a. Change in color
b. Destroy the agar
c. Destroy red blood cells
d. Do not change anything
Explanation / Answer
1. Quantitative techniques
2. This is the wrong answer
3. 16mm
4. To get the experiment over with
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