Test Multi Choice Flashcards
what types of products can be detected in a phenol red broth test?
Gases, acidic products, and alkaline products
Nitrate reductase converts…
nitrate to nitrite
The oxidation- reduction indicator in fluid thioglycollate media is…
resazurin
simmons citrate agar is what kind of media and contains what as a carbon source?
defined media and citrate as carbon source
T or F
There is a direct relationship between the turbidity of a culture and the number of microbes in that culture
true
The indole test is used to detect the deamination of which amino acid?
tryptophan
What is not in urea broth?
a) potassium phosphate buffer
b) ph indicator phenol red
c) ammonia
d) urea
C
T or F
In a close growth system anaerobic conditions are achieved because no nutrients are added and no waste products are removed for the culture
False
achieved bc there is no O2
T or F
the only carbs that can be used in the phenol red broth test are glucose, lactose, and sucrose
False
T or F
Bacteria that are classified as microaerophiles can survive only when oxygen levels are low
true
the oxidase test determines whether an organism has what?
chytochrome C oxidase
In the anaerobic jar exercise, what type of gas was used to generate the anaerobic conditions?
carbon dioxide
T or F
In the VP test a rise in the pH of the media causes the broth to become red in color, which indicates that the organism is VP +
false
bc of diacetyl and guanidine
T or F
gelatinase breaks down the glycosidic bonds between amino acid molecules in gelatin
false
peptide bonds
In a spectrophotometer, a _______ beam of light is shone through a sample in order to measure the absorbance?
monochromatic
