Micro Lab Final 1012-91 Al-Dujaili
LSUE Questions and Correct Answers
-prevent unfiltered air or dust particles from entering the tubes
-maintain anaerobic conditions
-and prevent culture from spilling
*all of the above* - correct answer ✔✔Cotton plugs or screw caps are used in test tubes
containing sterile media or pure cultures to...
adding drops of HCL to *lower* it or NaOH to *raise* it - correct answer ✔✔If the pH of the
medium is higher than 7.0, you can adjust to 7.0 by:
Bromothymol blue - correct answer ✔✔The pH indicator in Simmons Citrate agar is what?
facultative - correct answer ✔✔bacteria that show no preference, grow equally well in aerobic
or anaerobic conditions are
casein (from the milk biology handout) - correct answer ✔✔what protein gives milk its white
color?
-salt
-carbohydrates
, -vitamins
*all of the above* - correct answer ✔✔beef extract is a source of:
heterotrophic - correct answer ✔✔bacteria that grow in the dark and in media composed
mainly of organic compounds are
selective media - correct answer ✔✔media that allows *one type* of bacteria to grow on them
while preventing growth of other types of bacteria is called
synthetic medium - correct answer ✔✔a medium that contains substances whose exact
chemical composition is known is called a
microaerophile - correct answer ✔✔a microorganism that grows in the presence of a very low
concentration of free oxygen is known as a
*they are poisoned by high concentrations of oxygen. They gather in the upper part of the test
tube but not the very top.*
heterotrophs have greater synthetic ability - correct answer ✔✔which of the following
statements is most nearly true of heterotrophic organisms compared to autotrophs?
amylase - correct answer ✔✔the ability of organisms to hydrolyze starch is accompanied with
the enzyme:
use of a Durham tube - correct answer ✔✔If a microbe produces gas when it utilizes glucose,
the presence of this gas can be determined by:
LSUE Questions and Correct Answers
-prevent unfiltered air or dust particles from entering the tubes
-maintain anaerobic conditions
-and prevent culture from spilling
*all of the above* - correct answer ✔✔Cotton plugs or screw caps are used in test tubes
containing sterile media or pure cultures to...
adding drops of HCL to *lower* it or NaOH to *raise* it - correct answer ✔✔If the pH of the
medium is higher than 7.0, you can adjust to 7.0 by:
Bromothymol blue - correct answer ✔✔The pH indicator in Simmons Citrate agar is what?
facultative - correct answer ✔✔bacteria that show no preference, grow equally well in aerobic
or anaerobic conditions are
casein (from the milk biology handout) - correct answer ✔✔what protein gives milk its white
color?
-salt
-carbohydrates
, -vitamins
*all of the above* - correct answer ✔✔beef extract is a source of:
heterotrophic - correct answer ✔✔bacteria that grow in the dark and in media composed
mainly of organic compounds are
selective media - correct answer ✔✔media that allows *one type* of bacteria to grow on them
while preventing growth of other types of bacteria is called
synthetic medium - correct answer ✔✔a medium that contains substances whose exact
chemical composition is known is called a
microaerophile - correct answer ✔✔a microorganism that grows in the presence of a very low
concentration of free oxygen is known as a
*they are poisoned by high concentrations of oxygen. They gather in the upper part of the test
tube but not the very top.*
heterotrophs have greater synthetic ability - correct answer ✔✔which of the following
statements is most nearly true of heterotrophic organisms compared to autotrophs?
amylase - correct answer ✔✔the ability of organisms to hydrolyze starch is accompanied with
the enzyme:
use of a Durham tube - correct answer ✔✔If a microbe produces gas when it utilizes glucose,
the presence of this gas can be determined by:
