bio 253 lab #2 Exam | Atcual Questions and
Answers with Verified Solutions | Latest
Updated 2026
what are two functions of the adhesion
capsule in bacterial cells protection/ avoid phagocytosis (prevents
from
getting eaten
What are the molecules that found polysaccarides
in polypeptides
bacterial capsules?
a student heat fixes his smear for it can cause the capsule to shrink and
capsule staining,what is the potentially
result? tidally melt the capsule,
and will be harder to see
virulence factor makes a microbe hard to kill and cause
disease
what's one thing you don't do DO NOT heat fix!!
when
capsule staining
name at least one encapsulated klebsiella pnumonae
bacteria
, why is the gram stain important? it helps differentiate the diff cell
morphology
between two bacteria
difference between gram positive gram positive has a thicker cell wall, and
and gram negative cell wall traps the
crystal violet causing it to stain purple
gram negative has a thin wall, and turns
red from
safarnin
what are the steps of the gram crystal violet
stain wash
grams iodine
wash
decolorize (ethanol)
wash
safranin
wash
dry
what is crystal violet used for in its the primary stain, used to bind to the
the thick
gram stain? peptidoglycan layer
what is grams iodine used for in grams iodine acts as a mordant, its binds
the to the
gram stain? crystal violet to make it harder to wash off.
what is ethanol used for in the its a decolorizing agent to differentiate
gram between
stain? gram positive and negative bacteria
it decolorizes gram negative cells
Answers with Verified Solutions | Latest
Updated 2026
what are two functions of the adhesion
capsule in bacterial cells protection/ avoid phagocytosis (prevents
from
getting eaten
What are the molecules that found polysaccarides
in polypeptides
bacterial capsules?
a student heat fixes his smear for it can cause the capsule to shrink and
capsule staining,what is the potentially
result? tidally melt the capsule,
and will be harder to see
virulence factor makes a microbe hard to kill and cause
disease
what's one thing you don't do DO NOT heat fix!!
when
capsule staining
name at least one encapsulated klebsiella pnumonae
bacteria
, why is the gram stain important? it helps differentiate the diff cell
morphology
between two bacteria
difference between gram positive gram positive has a thicker cell wall, and
and gram negative cell wall traps the
crystal violet causing it to stain purple
gram negative has a thin wall, and turns
red from
safarnin
what are the steps of the gram crystal violet
stain wash
grams iodine
wash
decolorize (ethanol)
wash
safranin
wash
dry
what is crystal violet used for in its the primary stain, used to bind to the
the thick
gram stain? peptidoglycan layer
what is grams iodine used for in grams iodine acts as a mordant, its binds
the to the
gram stain? crystal violet to make it harder to wash off.
what is ethanol used for in the its a decolorizing agent to differentiate
gram between
stain? gram positive and negative bacteria
it decolorizes gram negative cells
