Name: ___________________________ Date: ____________________ Period: _________
Microbial Control Exercise
1.) The stage in the population growth curve with the highest rate if cell division is called the
________ phase.
2.) Which category of microbes would you expect to grow best on or in your body?
a. psychrophiles
b. mesophiles c. thermophiles d. hyperthermophiles
3.) Which phase in a population growth curve is associated with no increase or decrease in
population?
4.) Which section of the bacterial growth curve shows a growth phase where the number of cells
dying equals the number of cells dividing?
5.) Which of the following pairs is mismatched?
a.) Psychrotroph- growth at 0C
b.) Thermophile- growth at 37C
c.) Mesophile- growth at 25C
d.) Psychrophile-growth at 15C
e.) None of the above
6.) The term facultative anaerobe refers to an organism that
a.) Doesn’t use oxygen but tolerates it
b.) Is killed by oxygen
c.) Uses oxygen or grows without oxygen
d.) Requires less oxygen that is present in air
e.) Prefers to grow without oxygen
7.) What type of solution is mostly required by bacteria in order to grow?
8.) Draw and label the following: hypertonic solutions, hypotonic solutions, isotonic solutions.
Describe what is happening to the cell in each solution.
9.) The term "growth" when used for microorganisms, refers to:
a. an increase in cell number
b. production of endospores
c. the age and size of the cell
d. all of the above
10.)
a.) Which phenomenon occurs when bacteria are placed in high salt concentration?
b.) What conditions that are characteristics of the food tend to retard spoilage in each of
the following foods?
i.) Picklesii.) Salted fish-
Name: ___________________________ Date: ____________________ Period: _________
Microbial Control Exercise
1.) The stage in the population growth curve with the highest rate if cell division is called the
________ phase.
2.) Which category of microbes would you expect to grow best on or in your body?
a. psychrophiles
b. mesophiles c. thermophiles d. hyperthermophiles
3.) Which phase in a population growth curve is associated with no increase or decrease in
population?
4.) Which section of the bacterial growth curve shows a growth phase where the number of cells
dying equals the number of cells dividing?
5.) Which of the following pairs is mismatched?
a.) Psychrotroph- growth at 0C
b.) Thermophile- growth at 37C
c.) Mesophile- growth at 25C
d.) Psychrophile-growth at 15C
e.) None of the above
6.) The term facultative anaerobe refers to an organism that
a.) Doesn’t use oxygen but tolerates it
b.) Is killed by oxygen
c.) Uses oxygen or grows without oxygen
d.) Requires less oxygen that is present in air
e.) Prefers to grow without oxygen
7.) What type of solution is mostly required by bacteria in order to grow?
8.) Draw and label the following: hypertonic solutions, hypotonic solutions, isotonic solutions.
Describe what is happening to the cell in each solution.
9.) The term "growth" when used for microorganisms, refers to:
a. an increase in cell number
b. production of endospores
c. the age and size of the cell
d. all of the above
10.)
a.) Which phenomenon occurs when bacteria are placed in high salt concentration?
b.) What conditions that are characteristics of the food tend to retard spoilage in each of
the following foods?
i.) Picklesii.) Salted fish-