MIC 205 MODULE 2 EXAM QUESTIONS WITH VERIFIED ANSWERS
LATEST UPDATE 2026
Doubling Time - Answers (a.k.a. generation time) the time it takes for one population
to double through one round of binary fission
Growth Curve - Answers A reproducible growth pattern of microorganisms grown in
closed culture (no nutrients added, no waste removed)
Culture Density - Answers # of cells/unit vol. in the environment
Biofilms - Answers complex & dynamic ecosystem of microorganisms in a highly
structured, advantageous community
EPS - Answers Extracellular Polymeric Substances are secreted by organisms in
biofilms - hydrated gel mostly polysacchardies, some proteins, nucelic acids, and
lipids - maintains function of biofilm allowing movement of nutrients, wase, and
gases keeping the cell hydrated and preventing desiccation, sheltering organisms from
predation.
Planktonic Cells - Answers FREE-FLOATING MICROBIAL CELLS LIVING IN
ACQUATIC ENVIORNMENTS THAT ATTACH TO A SUBSTRATE AND FORM
BIOFILMS
Quorom Sensing - Answers How cells in a biofilm coordinate activities in response
to environmental stimuli, which can occur between cells of difference species within a
biofilm, enabling microorganisms to detect their cell density through release and
binding of small diffusible autoinducers.
Reactive Oxygen Species (ROS) - Answers highly unstable ions & molecules derived
from partial reduction of oxygen that can damage virtually any macromolecule or
structure with which they come in contact. Ex: Singlet oxygen (O2), Superoxide
(O2-), Peroxides (H2O2), Hydroxyl Radical (OH), Hypochlorite ion (OCl-)
minimum permissive oxygen concentration - Answers lowest concentration of
oxygen that allows bacterial growth
maximum permissive oxygen concentration - Answers highest tolerated
concentration of oxygen for bacterial growth
Capnophiles - Answers bacteria that grow best in a higher concentration of CO2 and
lower concentration of oxygen present in the atmosphere. Best grown in candle jars,
as the flame consumes the oxygen and releases CO2.
LATEST UPDATE 2026
Doubling Time - Answers (a.k.a. generation time) the time it takes for one population
to double through one round of binary fission
Growth Curve - Answers A reproducible growth pattern of microorganisms grown in
closed culture (no nutrients added, no waste removed)
Culture Density - Answers # of cells/unit vol. in the environment
Biofilms - Answers complex & dynamic ecosystem of microorganisms in a highly
structured, advantageous community
EPS - Answers Extracellular Polymeric Substances are secreted by organisms in
biofilms - hydrated gel mostly polysacchardies, some proteins, nucelic acids, and
lipids - maintains function of biofilm allowing movement of nutrients, wase, and
gases keeping the cell hydrated and preventing desiccation, sheltering organisms from
predation.
Planktonic Cells - Answers FREE-FLOATING MICROBIAL CELLS LIVING IN
ACQUATIC ENVIORNMENTS THAT ATTACH TO A SUBSTRATE AND FORM
BIOFILMS
Quorom Sensing - Answers How cells in a biofilm coordinate activities in response
to environmental stimuli, which can occur between cells of difference species within a
biofilm, enabling microorganisms to detect their cell density through release and
binding of small diffusible autoinducers.
Reactive Oxygen Species (ROS) - Answers highly unstable ions & molecules derived
from partial reduction of oxygen that can damage virtually any macromolecule or
structure with which they come in contact. Ex: Singlet oxygen (O2), Superoxide
(O2-), Peroxides (H2O2), Hydroxyl Radical (OH), Hypochlorite ion (OCl-)
minimum permissive oxygen concentration - Answers lowest concentration of
oxygen that allows bacterial growth
maximum permissive oxygen concentration - Answers highest tolerated
concentration of oxygen for bacterial growth
Capnophiles - Answers bacteria that grow best in a higher concentration of CO2 and
lower concentration of oxygen present in the atmosphere. Best grown in candle jars,
as the flame consumes the oxygen and releases CO2.
