Deck 6: Microbial Viability and Growth

Question 1

Match the following terms or phrases with the correct description or definition.​
a.Devices which allow bacterial cultures to be grown at a steady rate by removing waste products and adding fresh nutrients.
b.The amount of cloudiness present of a bacterial population in liquid media.
c.Groups of chemical compounds which, when linked together form the building blocks of DNA or RNA.
d.A solution with osmotic pressure lower than inside a cell, causing cell to swell with fluid.
e.Essential organic compounds which cannot be synthesized by some microbes so must be obtained from the surrounding environment.
f.Ability of bacteria to communicate by way of secreted factors such as Autoinducers and behave as a cohesive group rather than as individuals.
g.A laboratory device which spins specimens to separate fluids of differing density or liquids from solids.
h.An adherent layer created by a multicellular group bound by an extracellular matrix produced by the colony.
i.Microbes with optimum temperature of 98.6° F or 37° C, normal human body temperature.
j.A mixture in which solid particles are mixed into and spread throughout a liquid medium.
​Turbidity

Answer 1

b

Question 2

_____________ is the basic building block for living organisms on Earth.​

Answer 2

Carbon​

Question 3

Match the following terms or phrases with the correct description or definition.​
a.Devices which allow bacterial cultures to be grown at a steady rate by removing waste products and adding fresh nutrients.
b.The amount of cloudiness present of a bacterial population in liquid media.
c.Groups of chemical compounds which, when linked together form the building blocks of DNA or RNA.
d.A solution with osmotic pressure lower than inside a cell, causing cell to swell with fluid.
e.Essential organic compounds which cannot be synthesized by some microbes so must be obtained from the surrounding environment.
f.Ability of bacteria to communicate by way of secreted factors such as Autoinducers and behave as a cohesive group rather than as individuals.
g.A laboratory device which spins specimens to separate fluids of differing density or liquids from solids.
h.An adherent layer created by a multicellular group bound by an extracellular matrix produced by the colony.
i.Microbes with optimum temperature of 98.6° F or 37° C, normal human body temperature.
j.A mixture in which solid particles are mixed into and spread throughout a liquid medium.
​Growth factors

Answer 3

e

Question 4

The time it takes for a bacterial colony to divide and double its population size is called ________________ or doubling time.​

Question 5

Match the following terms or phrases with the correct description or definition.​
a.Devices which allow bacterial cultures to be grown at a steady rate by removing waste products and adding fresh nutrients.
b.The amount of cloudiness present of a bacterial population in liquid media.
c.Groups of chemical compounds which, when linked together form the building blocks of DNA or RNA.
d.A solution with osmotic pressure lower than inside a cell, causing cell to swell with fluid.
e.Essential organic compounds which cannot be synthesized by some microbes so must be obtained from the surrounding environment.
f.Ability of bacteria to communicate by way of secreted factors such as Autoinducers and behave as a cohesive group rather than as individuals.
g.A laboratory device which spins specimens to separate fluids of differing density or liquids from solids.
h.An adherent layer created by a multicellular group bound by an extracellular matrix produced by the colony.
i.Microbes with optimum temperature of 98.6° F or 37° C, normal human body temperature.
j.A mixture in which solid particles are mixed into and spread throughout a liquid medium.
​Centrifuge

Question 6

The temperature that is most favorable for bacterial growth is considered its ________________ temperature.​

Question 7

Match the following terms or phrases with the correct description or definition.​
a.Devices which allow bacterial cultures to be grown at a steady rate by removing waste products and adding fresh nutrients.
b.The amount of cloudiness present of a bacterial population in liquid media.
c.Groups of chemical compounds which, when linked together form the building blocks of DNA or RNA.
d.A solution with osmotic pressure lower than inside a cell, causing cell to swell with fluid.
e.Essential organic compounds which cannot be synthesized by some microbes so must be obtained from the surrounding environment.
f.Ability of bacteria to communicate by way of secreted factors such as Autoinducers and behave as a cohesive group rather than as individuals.
g.A laboratory device which spins specimens to separate fluids of differing density or liquids from solids.
h.An adherent layer created by a multicellular group bound by an extracellular matrix produced by the colony.
i.Microbes with optimum temperature of 98.6° F or 37° C, normal human body temperature.
j.A mixture in which solid particles are mixed into and spread throughout a liquid medium.
​Mesophiles

Question 8

How many phases are there in bacterial growth?​

A)​Two
B)​Three
C)​Four
D)​Five

Question 9

Which direct counting method is reported in terms of colony forming units (CFUs)?​

A)​Direct count
B)​Filtration
C)​Plate count
D)​Most probable number

Question 10

______________________ are often used to plot large numbers in a graphic bacterial population growth curve rather than arithmetically plotting the information.​

Question 11

Match the following terms or phrases with the correct description or definition.​
a.Devices which allow bacterial cultures to be grown at a steady rate by removing waste products and adding fresh nutrients.
b.The amount of cloudiness present of a bacterial population in liquid media.
c.Groups of chemical compounds which, when linked together form the building blocks of DNA or RNA.
d.A solution with osmotic pressure lower than inside a cell, causing cell to swell with fluid.
e.Essential organic compounds which cannot be synthesized by some microbes so must be obtained from the surrounding environment.
f.Ability of bacteria to communicate by way of secreted factors such as Autoinducers and behave as a cohesive group rather than as individuals.
g.A laboratory device which spins specimens to separate fluids of differing density or liquids from solids.
h.An adherent layer created by a multicellular group bound by an extracellular matrix produced by the colony.
i.Microbes with optimum temperature of 98.6° F or 37° C, normal human body temperature.
j.A mixture in which solid particles are mixed into and spread throughout a liquid medium.
​Hypotonic

Question 12

Match the following terms or phrases with the correct description or definition.​
a.Devices which allow bacterial cultures to be grown at a steady rate by removing waste products and adding fresh nutrients.
b.The amount of cloudiness present of a bacterial population in liquid media.
c.Groups of chemical compounds which, when linked together form the building blocks of DNA or RNA.
d.A solution with osmotic pressure lower than inside a cell, causing cell to swell with fluid.
e.Essential organic compounds which cannot be synthesized by some microbes so must be obtained from the surrounding environment.
f.Ability of bacteria to communicate by way of secreted factors such as Autoinducers and behave as a cohesive group rather than as individuals.
g.A laboratory device which spins specimens to separate fluids of differing density or liquids from solids.
h.An adherent layer created by a multicellular group bound by an extracellular matrix produced by the colony.
i.Microbes with optimum temperature of 98.6° F or 37° C, normal human body temperature.
j.A mixture in which solid particles are mixed into and spread throughout a liquid medium.
​Quorum sensing

Question 13

Which of the following methods of bacterial counts is considered indirect?​

A)​Direct count​
B)Filtration​
C)​Plate count
D)​Turbidity

Question 14

Obligate ________________ are microbes which cannot tolerate molecular oxygen.​

Question 15

In which stage of microbial growth is there no division seen for a period of one hour to several days?​

A)​Lag
B)​Log
C)​Death
D)​Stationary

Question 16

Match the following terms or phrases with the correct description or definition.​
a.Devices which allow bacterial cultures to be grown at a steady rate by removing waste products and adding fresh nutrients.
b.The amount of cloudiness present of a bacterial population in liquid media.
c.Groups of chemical compounds which, when linked together form the building blocks of DNA or RNA.
d.A solution with osmotic pressure lower than inside a cell, causing cell to swell with fluid.
e.Essential organic compounds which cannot be synthesized by some microbes so must be obtained from the surrounding environment.
f.Ability of bacteria to communicate by way of secreted factors such as Autoinducers and behave as a cohesive group rather than as individuals.
g.A laboratory device which spins specimens to separate fluids of differing density or liquids from solids.
h.An adherent layer created by a multicellular group bound by an extracellular matrix produced by the colony.
i.Microbes with optimum temperature of 98.6° F or 37° C, normal human body temperature.
j.A mixture in which solid particles are mixed into and spread throughout a liquid medium.
​Suspension

Question 17

Match the following terms or phrases with the correct description or definition.​
a.Devices which allow bacterial cultures to be grown at a steady rate by removing waste products and adding fresh nutrients.
b.The amount of cloudiness present of a bacterial population in liquid media.
c.Groups of chemical compounds which, when linked together form the building blocks of DNA or RNA.
d.A solution with osmotic pressure lower than inside a cell, causing cell to swell with fluid.
e.Essential organic compounds which cannot be synthesized by some microbes so must be obtained from the surrounding environment.
f.Ability of bacteria to communicate by way of secreted factors such as Autoinducers and behave as a cohesive group rather than as individuals.
g.A laboratory device which spins specimens to separate fluids of differing density or liquids from solids.
h.An adherent layer created by a multicellular group bound by an extracellular matrix produced by the colony.
i.Microbes with optimum temperature of 98.6° F or 37° C, normal human body temperature.
j.A mixture in which solid particles are mixed into and spread throughout a liquid medium.
​Biofilm

Question 18

Match the following terms or phrases with the correct description or definition.​
a.Devices which allow bacterial cultures to be grown at a steady rate by removing waste products and adding fresh nutrients.
b.The amount of cloudiness present of a bacterial population in liquid media.
c.Groups of chemical compounds which, when linked together form the building blocks of DNA or RNA.
d.A solution with osmotic pressure lower than inside a cell, causing cell to swell with fluid.
e.Essential organic compounds which cannot be synthesized by some microbes so must be obtained from the surrounding environment.
f.Ability of bacteria to communicate by way of secreted factors such as Autoinducers and behave as a cohesive group rather than as individuals.
g.A laboratory device which spins specimens to separate fluids of differing density or liquids from solids.
h.An adherent layer created by a multicellular group bound by an extracellular matrix produced by the colony.
i.Microbes with optimum temperature of 98.6° F or 37° C, normal human body temperature.
j.A mixture in which solid particles are mixed into and spread throughout a liquid medium.
​Nucleotides

Question 19

Match the following terms or phrases with the correct description or definition.​
a.Devices which allow bacterial cultures to be grown at a steady rate by removing waste products and adding fresh nutrients.
b.The amount of cloudiness present of a bacterial population in liquid media.
c.Groups of chemical compounds which, when linked together form the building blocks of DNA or RNA.
d.A solution with osmotic pressure lower than inside a cell, causing cell to swell with fluid.
e.Essential organic compounds which cannot be synthesized by some microbes so must be obtained from the surrounding environment.
f.Ability of bacteria to communicate by way of secreted factors such as Autoinducers and behave as a cohesive group rather than as individuals.
g.A laboratory device which spins specimens to separate fluids of differing density or liquids from solids.
h.An adherent layer created by a multicellular group bound by an extracellular matrix produced by the colony.
i.Microbes with optimum temperature of 98.6° F or 37° C, normal human body temperature.
j.A mixture in which solid particles are mixed into and spread throughout a liquid medium.
​Chemostats

Question 20

Formation of biofilms is primarily dependent on the ability of bacteria for:​

A)​Colony growth
B)​Generation time
C)​Osmotic pressure
D)​Quorum sensing

Question 21

Approximately 50% of the dry weight of a bacterium is carbon.​

Question 22

An example of a solute is water and an example of a solvent is salt.​

Question 23

Substances with a pH of 6 or lower are termed alkaline.​

Question 24

Bioleaching is a method of removing microbial contamination from soil and plants.​

Question 25

Salted fish and meats are preserved and kept free of microbial growth by plasmolysis.​

Question 26

Second intention healing is characterized by the filling in of a wound with granulation tissue from the bottom up.​

Question 27

Facultative anaerobes produce energy more efficiently in the absence of oxygen.​

Question 28

Smelting is the process of extracting metals from ore by heat or chemical refining.​

Question 29

Pheromones are chemical signaling molecules used in quorum sensing of bacteria and also known as autoinducers.​

Question 30

E.coli is a species of bacteria which do not require additional growth factors.​