__ cause partial lysis of red blood cells, __ cause complete lysis
of red blood cells and __ do not lyse red blood cells... Correct
Answer alpha-hemolysins, beta-hemolysins, gamma-
hemolysins
A bacterial isolate is subcultured to two blood agar plates, one of
which is incubated in an anaerobe jar, and the other is incubated
on a shelf in the incubator. After incubation, growth is observed
on the plate from the anaerobe jar, but there is not growth on the
plate incubated on the incubator shelf. Based on these results
how would this organism be categorized... Correct Answer
obligate anaerobe
A chemical compound, regardless of its source (either natural or
synthetic) that is capable of killing or inhibiting microorganisms
is referred to as... Correct Answer an antimicrobial
A large zone of inhibition around a disk containing disinfectant
generally indicates that the bacteria being tested is resistant to
the disinfectant... Correct Answer false
A phenol red glucose broth with a Durham tube has been
inoculated and incubated. After 48 hours, the broth is turbid and
bright yellow and approximately half of the contest of the
Durham tube have been displaced with gas. Interpret these
results... Correct Answer the organism is fermenting glucose
, An experiment involves the inoculation bacteria onto a variety
of media with NaCl concentrations ranging from 1% to 25%.
Which of these media is most likely to be isotonic with the
bacterial cells... Correct Answer 1%
An organism that ferments glucose via the mixed acid
fermentation pathway will be... Correct Answer red in the
methyl red test
Bacitracin would not be effective in which scenario... Correct
Answer A & B (Bacteria with no cell walls, Bacteria that are
not growing)
Bacterial fermentation of sugars usually results in __ end
products whereas breakdown of proteins and amino acids results
in the formation of __ end products... Correct Answer acidic,
alkaline
Both human pathogens and normal microbiota are typically
classified as... Correct Answer mesophiles
During aerobic cellular respiration, H2O2 is produced as a waste
product that is classified as a... Correct Answer reactive oxygen
species (ROS)
How are agar plats inoculated for disk diffusion testing of
antiseptics and disinfectants... Correct Answer a swab is used
to inoculate the entire surface of the plate, producing a lawn of
growth
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