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MCB 2610 Chapter 7 Part 1 Question and answers 100% correct 2024/2025
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MCB 2610 Chapter 7 Part 1 Question and answers 100% correct 2024/2025 MCB 2610 Chapter 7 Part 1 Halophiles grow optimally in _____ M a) more than 2 M b) less than 0.2 M c) more than 0.1 M d) Less than 0.1 M - correct answer B Extreme Halophiles grow optimally in _____ M a) more than 2...

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  • October 16, 2024
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  • 2024/2025
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MCB 2610 Chapter 7 Part 1
Halophiles grow optimally in _____ M
a) more than 2 M
b) less than 0.2 M
c) more than 0.1 M
d) Less than 0.1 M - correct answer ✔B


Extreme Halophiles grow optimally in _____ M
a) more than 2 M
b) less than 0.2 M
c) more than 0.1 M
d) Less than 0.1 M - correct answer ✔A


Which is true regarding Compatible solutes?
a) They can be built up to prevent swelling
b) They create a counter balance so water doesn't leave cell
c) both
d) neither - correct answer ✔C


What is the purpose of Compatible solutes? - correct answer ✔Prevent
excess water from killing the cell


Do we need water in cells for chemical rxns? - correct answer ✔Yes


Why don't microorganisms grow in distilled water? - correct answer
✔Because we add a solute so that the cells interact with the solute instead

,Pickling is used to preserve food. How does this work? - correct answer
✔The kurine (table salt) is added to cucumbers. The microorganisms will then
interact with the salt, not the food. The water also interacts with the solute
instead of food.


Water activity - correct answer ✔amount of moisture/water available to
organisms


The water activity (Aw) of distilled water is:
a) 1.0
b) 0.97
c) 0.5
d) 0.1 - correct answer ✔A


The water activity (Aw) of milk is:
a) 1.0
b) 0.97
c) 0.5
d) 0.1 - correct answer ✔B


The water activity (Aw) of dried fruit is:
a) 1.0
b) 0.97
c) 0.5
d) 0.1 - correct answer ✔C

,Osmotolerant microbes can grow in:
a) high water activity
b) low water activity
c) medium water activity
d) a wide range of water activity - correct answer ✔D


Is Staphylococcus aureus osmotolerant? - correct answer ✔Yes, it can grow
in extreme water conditions. Especially very low water content. It perfers 3 M
NaCl


True or false? Microbes have different optimal temperatures - correct answer
✔True


Most archaea are - correct answer ✔hyperthermophiles (like extreme cold
and heat)


True or false? Optimum growth temp shifts towards the:
a) minimum growth temp
b) maximum growth temp - correct answer ✔B


_____ perfer extreme cold temperatures such as that in Antartica
a) Psychrophiles
b) Psychrotrophs
c) Mesophiles
d) Thermophiles
e) Hyperthermophiles - correct answer ✔A

, _____ can grow at refridgeration temperature. An example of this is Lisreria
which can grow and replicate within your own refridgerator.
a) Psychrophiles
b) Psychrotrophs
c) Mesophiles
d) Thermophiles
e) Hyperthermophiles - correct answer ✔B


_____ can grow at human body temperature (about 37 degrees).
a) Psychrophiles
b) Psychrotrophs
c) Mesophiles
d) Thermophiles
e) Hyperthermophiles - correct answer ✔C


_____
a) Psychrophiles
b) Psychrotrophs
c) Mesophiles
d) Thermophiles
e) Hyperthermophiles - correct answer ✔


_____ prefer 0-20 degrees C
a) Psychrophiles
b) Psychrotrophs
c) Mesophiles

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