question
partial hemolysis on blood agar plates is called...
answer
alpha
question
blood agar plates are _______ for hemolysis
answer
differential
question
which type of media is not differential?
answer
phenylethanol agar
question
phenylethanol agar is used
answer
to select for gram positive bacteria
question
true or false: macconkey agar is enriched with salt
answer
false
question
eosin methylene blue agar is selective for _______ and differential for ________
answer
gram negative organisms, lactose fermentation
question
mannitol salt agar is selective for _______ and differential for ________
answer
salt tolerant organisms, mannitol fermentation
question
which of the following types of agar would be the most helpful for isolating and differentiating staphylococcus aureus from other types of organisms
answer
mannitol salt agar
question
a ________ medium contains one or more compounds to distinguish between microbes in the medium, while a ___________ medium contains one or more additives to encourage the growth of fastidious microbes
answer
differential, enriched
question
macconkey agar is differential for _________ fermentation
answer
lactose
question
The enzyme phenylalanase converts phenylalanine into
answer
ammonia and phenylpyruvic acid
question
true or false: a mannitol fermenter appears yellow on mannitol salt agar
answer
true
question
carbohydrate fermentation....
answer
may produce gas, produces acid
question
how does beta hemolysis appear on blood agar?
answer
a clear zone surrounding the colony
question
amylase is the enzyme responsible for digesting...
answer
starch
question
a positive catalase result ______
answer
bubbles
question
SIM media detects the production of hydrogen sulfide, indole production, and motility. a positive indole test indicates the enzyme ________ was produced by the bacterial strain
answer
tryptophanase
question
the urease converts urea into ammonia (NH3) and _________
answer
carbon dioxide
question
what color will a lactose fermenter appear on macconkey agar?
answer
pink
question
a durham tube is used to detect ________ produced by carbohydrate fermentation
answer
gas
question
which of the following is not a part of the definition of a coliform
answer
gram positive
question
to test for indole production in a SIM tube, you would need to _______
answer
add kovac's reagent and check for a red/pink color
question
true or false: salmonella can cause typhoid fever
answer
true
question
what is the term that is used if water is coliform free and drinkable?
answer
potable
question
what is one illness caused by staphylococcus aureus?
answer
toxic shock syndrome
question
a positive test for the utilization of citrate would result in
answer
a pink color
question
which of the following organisms is used as an indicator of fecal contamination of water?
answer
escherichia coli
question
true or false: to test of starch hydrolysis, the reagent iodine was added to the plate after incubation
answer
true
question
which of the following organisms is part of everyone's normal flora of the skin, mucous membranes, and throat?
answer
staphylococcus epidermidis
question
staphylococci are _______ while streptococci are ________
answer
catalase positive, catalase negative
question
In lab, we tested Streptococci Groups A-D for susceptibility to:
answer
bacitracin
question
what is one disease that streptococcus pneumoniae can cause?
answer
pneumonia
question
which group of streptococci is responsible for the formation of dental plaque?
answer
viridans group
question
true or false: the only member in group b streptococcus is streptococcus pyogenes
answer
false
question
which of the following organisms is a member of group c streptococcus?
answer
streptococcus equi
question
what is one disease that streptococcus pyogenes can cause?
answer
strep throat
question
Which of the following would be a positive result for the production of the enzyme coagulase?
answer
the formation of a clot
question
True or False: The rapid Staphylococcus aureus test is based on antigen/antibody reactions
answer
true
question
Which of the following organisms produces tryptophanase?
answer
escherichia coli
question
Suppose you are given an unknown sample that you need to identify as either Salmonella or Shigella. To accomplish this, you decide to use the rapid ID test. When you added the Shigella antiserum to your sample, white clumps were produced while the Salmonella antiserum resulted in a cloudy sample with no clumps. Based on these results, what was the identity of your unknown?
answer
shigella
question
Which of the following organisms is resistant to the antibiotic novobiocin?
answer
staph. saprophyticus
question
True or False: When trying to identify a bacterium as a member of Streptococcus Group A, B, C, or D, testing for susceptibility to the antibiotic bacitracin will give you sufficient information to identify the organism.
answer
false
question
Which of the following organisms causes β hemolysis on blood agar?
answer
staph. aureus
question
Which of the following organisms ferments lactose?
answer
escherichia coli
question
What would a positive test for the rapid detection of Streptococcus pyogenes look like?
answer
two pink lines
question
Which of the following organisms utilizes citrate?
answer
salmonella
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