Microbiology LAB Final Exam LSUE Exam Questions
With 100% Correct Answers.
Cotton plugs or screw caps are used in test tubes containing sterile media or
pure cultures to
a. Prevent unfiltered air or dust particles from entering the tubes, maintain anaerobic
conditions and prevent the culture from spilling
The pH indicator in Simmon's citrate agar is what?
a. Bromthymol Blue
Bacteria that show no preference, grow equally well in aerobic or anaerobic
conditions are
a. Facultative
The protein that DOES NOT give milk its white color is
a. Albumin
Beef extract is a source of
Salt, Vitamins, Carbohydrates
Bacteria which grow in the dark & in media composed mainly of organic
compounds are
Heterotrophic
Media that allows one type of bacteria to grow on them while preventing growth
of other types of bacteria is called
Selective media
If the pH of the medium is higher than 6.8 you can adjust to 6.8 by
Adding drops of HCL to lower it
A medium which contains substances whose exact chemical composition is
known is called
Synthetic medium
A microorganism which grows in the presence of very low concentration of free
oxygen is known as
Microaerophile
What is the most nearly true of heterotrophs compared to autotrophs?
Heterotrophs have greater synthetic ability
The ability of organisms to hydrolyze carbohydrate accomplished with the
enzyme is
Amylase
If a microbe produces gas when it utilizes glucose, the presence of this gas can
be determined by
The use of a Durham tube
A fluid thioglycollate medium is a medium that determines the ____________ of
bacteria
Oxygen's requirements
When talking about the VP test, Butanediol fermentation takes places and acetoin
is one of the products formed. What is its chemical nomenclature of an acetoin
end product?
2, 3-butanediol
With 100% Correct Answers.
Cotton plugs or screw caps are used in test tubes containing sterile media or
pure cultures to
a. Prevent unfiltered air or dust particles from entering the tubes, maintain anaerobic
conditions and prevent the culture from spilling
The pH indicator in Simmon's citrate agar is what?
a. Bromthymol Blue
Bacteria that show no preference, grow equally well in aerobic or anaerobic
conditions are
a. Facultative
The protein that DOES NOT give milk its white color is
a. Albumin
Beef extract is a source of
Salt, Vitamins, Carbohydrates
Bacteria which grow in the dark & in media composed mainly of organic
compounds are
Heterotrophic
Media that allows one type of bacteria to grow on them while preventing growth
of other types of bacteria is called
Selective media
If the pH of the medium is higher than 6.8 you can adjust to 6.8 by
Adding drops of HCL to lower it
A medium which contains substances whose exact chemical composition is
known is called
Synthetic medium
A microorganism which grows in the presence of very low concentration of free
oxygen is known as
Microaerophile
What is the most nearly true of heterotrophs compared to autotrophs?
Heterotrophs have greater synthetic ability
The ability of organisms to hydrolyze carbohydrate accomplished with the
enzyme is
Amylase
If a microbe produces gas when it utilizes glucose, the presence of this gas can
be determined by
The use of a Durham tube
A fluid thioglycollate medium is a medium that determines the ____________ of
bacteria
Oxygen's requirements
When talking about the VP test, Butanediol fermentation takes places and acetoin
is one of the products formed. What is its chemical nomenclature of an acetoin
end product?
2, 3-butanediol
