9/10/25, 11:28 AM
OHS 2 quiz 1 to midterm stuff actual exam 2025-2026 \latest version
with complete questions and accurate detailed answers \verified
100% Graded A+
How long after pellicle a few hours
formation does bacteria
attach to it?
What is the hair-like fimbriae
attachment bacteria use to
attach to the pellicle?
In Phase 3 of biofilm Gram +ve
development, what type of
bacteria colonize the
pellicle?
After attaching to the teeth Extracellular slime layer
surface, what do the -anchors bacteria to the tooth
bacteria produce? What -protection for the attached bacteria
does this product do?
After the extracellular Cell division
slime layer forms, how do
the bacteria proliferate?
periods when specific species or groups of species grow at
Bacterial bloom
rapidly accelerated rates
--> this causes the biofilm to grow in size
What shaped are bacterial mushroom-shaped
clusters in
mature dental plaque biofilm?
1/2
7
,9/10/25, 11:28 AM
Bacterial
Microcolonies
Extracellular
Structural elements of the
Mature Biofilm Slime Layer
Fluid forces of the
surrounding saliva Fluid
channels
Cell-to-cell communication
system Bacterial
signaling
Each bacterial microcolony oxygen
in a biofilm has its own concentration
unique environment. What pH
differences can be found in temperature
different microcolonies?
-Diversity helps survival of the biofilm
Why is bacterial diversity
-if only one type of bacteria in the biofilm, one toxic substance
important for biofilms?
can wipe it out
-can transfer resistances to different bacteria
Fluid forces of saliva change shape; development of extensions
the ___ of the biofilm,
resulting in ____from the
main body
of the biofilm
Fluid forces cause bacteria in faster spread of genes among bacteria >> increases risk of gaining
the biofilm to collide with one resistances
another, which causes ____
-penetrate the extracellular slime layer
What do Fluid channels in -bring nutrients and oxygen to the bacteria
biofilm do? -carry bacterial waste products away
Bacteria use to communicate Chemical
with one signals transfer
another, and this results in
of genes
____
The biofilm develops by ___ Stacking
one bacterial species on top
of another species
2/2
7
, 9/10/25, 11:28 AM
-the cell-to-cell adherence of one oral bacterium to another
Coaggregation -NOT random; each bacterial strain has a limited set of
other bacteria they will attach to
-NONpathogenic
Early colonizers in biofilm -lay foundation for growth of the biofilm
-must attach first before the pathogens can attach to the tooth
Many of these can attach to the acquired pellicle and
Streptococcal species early
colonizers one another -->many bacteria can adhere to
Streptococci
1) Early colonizers attach to pellicle coating on tooth surface
Sequence of colonization in 2) intermediate colonizers coaggregate with early colonizers
biofilm 3) late coaggregate with intermediate
If the biofilm is disrupted Reforming
daily by self care, it will
always be _ , which means
it must
start all over again with the
early colonizers
1) Within minutes: pellicle forms
2) within hours: early colonizers attach supragingivally
Timeline - Sequence of 3) 6 hours: surface of tooth crown is covered
attachment 4) Day 7: mature supragingival biofilim is formed
5) 3-12 weeks: subg biofilm starts to form
root
Subg attachment zones surface
SE
JE
What shape of bacteria coc
dominate tooth- associated ci
biofilms? rod
3/2
7
OHS 2 quiz 1 to midterm stuff actual exam 2025-2026 \latest version
with complete questions and accurate detailed answers \verified
100% Graded A+
How long after pellicle a few hours
formation does bacteria
attach to it?
What is the hair-like fimbriae
attachment bacteria use to
attach to the pellicle?
In Phase 3 of biofilm Gram +ve
development, what type of
bacteria colonize the
pellicle?
After attaching to the teeth Extracellular slime layer
surface, what do the -anchors bacteria to the tooth
bacteria produce? What -protection for the attached bacteria
does this product do?
After the extracellular Cell division
slime layer forms, how do
the bacteria proliferate?
periods when specific species or groups of species grow at
Bacterial bloom
rapidly accelerated rates
--> this causes the biofilm to grow in size
What shaped are bacterial mushroom-shaped
clusters in
mature dental plaque biofilm?
1/2
7
,9/10/25, 11:28 AM
Bacterial
Microcolonies
Extracellular
Structural elements of the
Mature Biofilm Slime Layer
Fluid forces of the
surrounding saliva Fluid
channels
Cell-to-cell communication
system Bacterial
signaling
Each bacterial microcolony oxygen
in a biofilm has its own concentration
unique environment. What pH
differences can be found in temperature
different microcolonies?
-Diversity helps survival of the biofilm
Why is bacterial diversity
-if only one type of bacteria in the biofilm, one toxic substance
important for biofilms?
can wipe it out
-can transfer resistances to different bacteria
Fluid forces of saliva change shape; development of extensions
the ___ of the biofilm,
resulting in ____from the
main body
of the biofilm
Fluid forces cause bacteria in faster spread of genes among bacteria >> increases risk of gaining
the biofilm to collide with one resistances
another, which causes ____
-penetrate the extracellular slime layer
What do Fluid channels in -bring nutrients and oxygen to the bacteria
biofilm do? -carry bacterial waste products away
Bacteria use to communicate Chemical
with one signals transfer
another, and this results in
of genes
____
The biofilm develops by ___ Stacking
one bacterial species on top
of another species
2/2
7
, 9/10/25, 11:28 AM
-the cell-to-cell adherence of one oral bacterium to another
Coaggregation -NOT random; each bacterial strain has a limited set of
other bacteria they will attach to
-NONpathogenic
Early colonizers in biofilm -lay foundation for growth of the biofilm
-must attach first before the pathogens can attach to the tooth
Many of these can attach to the acquired pellicle and
Streptococcal species early
colonizers one another -->many bacteria can adhere to
Streptococci
1) Early colonizers attach to pellicle coating on tooth surface
Sequence of colonization in 2) intermediate colonizers coaggregate with early colonizers
biofilm 3) late coaggregate with intermediate
If the biofilm is disrupted Reforming
daily by self care, it will
always be _ , which means
it must
start all over again with the
early colonizers
1) Within minutes: pellicle forms
2) within hours: early colonizers attach supragingivally
Timeline - Sequence of 3) 6 hours: surface of tooth crown is covered
attachment 4) Day 7: mature supragingival biofilim is formed
5) 3-12 weeks: subg biofilm starts to form
root
Subg attachment zones surface
SE
JE
What shape of bacteria coc
dominate tooth- associated ci
biofilms? rod
3/2
7
