Lab Quizzes Flashcards
T/F
Antimicrobial agents depend on several variables including pH, solubility, and toxicity
True
T/F
Bacteriostatic agents result in bacterial death
False
What is the enzyme that bacteria must have to break down the carbon source in a Simmons citrate agar?
Citrate lyase
The VP test for what fermentation product?
Acetoin
What is the indicator dye in the fermentation tubes?
Phenol red
What is a gas produced when a carbohydrate is completely reduced?
CO2
T/F
Propionibacterium and Staphylococcus are normal microflora of a host
True
T/F
S. aureus is coagulase positive
True
List 2 factors that protect skin from infection
high salt concentration and sebum
Give one reason why the minimum bactericidal concentration (MBC) of an antibiotic against a gram-positive and gram-negative bacterium could be different
Because gram positive and gram negative bacteria have differing cell walls, so the MBCs would be different if altering the cell wall is the antibiotics mechanism of action
(Photo of two disks, one ampicillin with a very small zone of inhibition and one vancomycin with a much larger zone of inhibition) What antibiotics is S. aureus susceptible to?
What anti
vancomycin
T/F
Complete hemolysis occurs with an alpha-hemolysis microbe
False
T/F
The lower respiratory tract is normally sterile
True
T/F
S. pneumonia is identified from other alpha-hemolytic streptococci by optochin inhibition
True
T/F
A reservoir is the continual source of infection
True
