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Microbiology Lab Midterm Barbosa Question and answers correctly
solved 2025
1.
parfocal
only a little fine adjustment is needed to bring a specimen
into
focus when switching from low to high power
2.
iris
diaphragm
used to vary the illumination of the object being viewed
3.
rheostat
changes the intensity of the light beam
4.
aseptic
technique
prevent the contamination of the culture and spreading of
microor-
ganisms into
the
environment
5. How can bacterial culture
media be distinguished?
composition, consistency, and purpose
6.
Advantages
of
Solid
Media
allows for isolation of bacteria as pure culture; mixed bacteria
can
be
separated
7.
agar
bacteriologically
inert
8.
semisolid
media
useful for the cultivation of microaerophilic bacteria or
determina-
tion of bacterial motility
9.
all
purpose
media
TSA
(tryptic
soy
agar)
and
TSB
(tryptic
soy
broth)
10.
turbid
dittusion
uniform
throughout
the
broth
11.
sediment
settles
at
the
bottom
12.
pellicle
flocculent
growth,
some
may
float
to
the
top
13.
endospores
not readily killed by many antimicrobial treatments (may be
central,
terminal, or subterminal)
