Part 2 Flashcards
Organisms adapted to grow well in environments below about pH 5.5.
A.) acidophiles
B.) neutrophiles
C.) alkaliphiles
A.) acidophiles
Organisms that prefer pH levels between 5.5 and 8.5
A.) acidophiles
B.) neutrophiles
C.) alkaliphiles
B.) neutrophiles
Organisms that live above pH 8.5.
A.) acidophiles
B.) neutrophiles
C.) alkaliphiles
C.) alkaliphiles
Under normal circumstances, bacteria maintain a near neutral internal environment regardless of their habitat; pH changes outside an organism’s range may destroy necessary membrane potential (in the production of ATP) and damage vital enzymes beyond repair.
This ______ of cellular enzymes may be as minor as conformational changes in the proteins’ tertiary structure, but usually is lethal to the cell.
denaturing
The ______ is designed to differentiate bacteria on the basis of fermentative or oxidative metabolism of carbohydrates. Used to differentiate bacteria based on their ability to oxidize or ferment specific sugars.
A.) Snyder Test
B.) Oxidation-Fermentation (O-F) Test
C.) Citrate Utilization Test
D.) SIM Medium
E.) Catalase Test
F.) Antimicrobial Susceptibility Test (Kirby-Bauer Method)
Oxidation-Fermentation (O-F) Test
This test causes bubbles to form.
A.) Snyder Test
B.) Oxidation-Fermentation (O-F) Test
C.) Citrate Utilization Test
D.) SIM Medium
E.) Catalase Test
F.) Antimicrobial Susceptibility Test (Kirby-Bauer Method)
Catalase Test
(This test is used to identify organisms that produce the enzyme catalase)
When hydrogen peroxide is added to a catalase-positive culture, oxygen gas bubbles form immediately. If no bubbles appear, the organism is catalase-negative.
The ______ was designed to differentiate members of Enterobacteriaceae, all of which are facultative anaerobes.
A.) Snyder Test
B.) Oxidation-Fermentation (O-F) Test
C.) Citrate Utilization Test
D.) SIM Medium
E.) Catalase Test
F.) Antimicrobial Susceptibility Test (Kirby-Bauer Method)
Citrate Test
The citrate utilization test is used to determine the ability of an organism to use citrate as its sole source of carbon.
_______ is used for determination of three bacterial activities: sulfur reduction, indole production from tryp- tophan, and motility.
A.) Snyder Test
B.) Oxidation-Fermentation (O-F) Test
C.) Citrate Utilization Test
D.) SIM Medium
E.) Catalase Test
F.) Antimicrobial Susceptibility Test (Kirby-Bauer Method)
SIM Medium
SIM medium is used to identify bacteria that are capable of producing indole, using the enzyme tryptophanase.
The _______ is designed to measure susceptibility to dental caries (tooth decay), caused primarily by lactobacilli and oral streptococci.
A.) Snyder Test
B.) Oxidation-Fermentation (O-F) Test
C.) Citrate Utilization Test
D.) SIM Medium
E.) Catalase Test
F.) Antimicrobial Susceptibility Test (Kirby-Bauer Method)
Snyder Test
Snyder Test medium is formulated to favor the growth of oral bacteria and discourage the growth of other bacteria.
_______ is a standardized method used to measure the effectiveness of antibiotics.
A.) Snyder Test
B.) Oxidation-Fermentation (O-F) Test
C.) Citrate Utilization Test
D.) SIM Medium
E.) Catalase Test
F.) Antimicrobial Susceptibility Test (Kirby-Bauer Method)
F.) Antimicrobial Susceptibility Test (Kirby-Bauer Method)
