PORTAGE LEARNING EXAM vc vc
Exam Solution
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Microbiology Portage Module 4 Microbial Growth and C vc vc vc vc vc vc vc
ontrol 2026 A+ GRADE ASSURED COMPLETE SOLUTION
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S AND VERIFIED ANSWERS (A24B6)
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QUESTION 1 vc
Expanding a given microbial population allows researchers to do what?
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ANSWER
to detect and assess the microorganism more easily
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QUESTION 2 vc
What is Growth Media?
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ANSWER
Growth media is a liquid or solid formulated to support microbial growth.
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QUESTION 3 vc
What does Growth Media contain?
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ANSWER
The media contains essential nutrients to provide the microbe with a source of carbon/energy. The nutr
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ient composition often includes a rich source of sugars, amino acids and vitamins.
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QUESTION 4 vc
What else can Growth Media also be called?
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ANSWER
Such media can also be referred to as a nutrient broth and is commonly used to grow microbes in a sus
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pension.
,QUESTION 5 vc
Describe LB media vc vc
ANSWER
Perhaps the most common nutrient broth in the lab, LB media (lysogeny broth) is a nutritionally rich liq
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uid known for its ability to grow a vast array of microbes.
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QUESTION 6 vc
What is Selective Media? vc vc vc
ANSWER
Selective media allows for only the growth of certain microbes and, by extension, restricts the growth of
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all others.
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QUESTION 7 vc
How can Selective Media be accomplished?
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ANSWER
Such an approach can be accomplished in a variety of ways including: using limiting amounts of nutrien
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ts, varying degrees of pH (being either very acidic or very basic media), or various chemical additives th
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at limit unwanted microbial growth (i.e.) antibiotics.
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QUESTION 8 vc
Describe how Selective Media works with Gram-Positive versus Gram-Negative bacteria.
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ANSWER
If a plate is selective for Gram-Negative then it will only grow Gram-
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Negative bacteria on it. It will not grow Gram-Positive bacteria on it.
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QUESTION 9 vc
What is Differential Media?
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ANSWER
Differential media distinguishes between two, often related, microbes.
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QUESTION 10 vc
, What is one way that a Differential Media can distinguish between Escherichia coli and S
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almonella?
ANSWER
They are both Gram negative but can be distinguished by the presence (or absence) of lactose fermentat
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ion. If grown on the same differential media, E coli ferments lactose and turns the culture red. In contra
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st, Salmonella does not ferment lactose and the culture remains white/tan in color. (This above example
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is probably on MacConkey agar)
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QUESTION 11 vc
What is a fastidious microorganism?
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ANSWER
an organism with complex growth requirements such that if absent it will not grow
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QUESTION 12 vc
What are Enriched Medias used for?
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ANSWER
Enriched media is used to grow fastidious microorganisms
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QUESTION 13 vc
Enriched Medias contain what? vc vc vc
ANSWER
enriched medias contain the essential nutrients required for the growth of this subset of microorganism
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s
QUESTION 14 vc
Can a plate be a combination of selective, differential and enriched?
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ANSWER
Yes
QUESTION 15 vc
Growth Media comes in what 2 forms?
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ANSWER
Exam Solution
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Microbiology Portage Module 4 Microbial Growth and C vc vc vc vc vc vc vc
ontrol 2026 A+ GRADE ASSURED COMPLETE SOLUTION
vc vc vc vc vc vc
S AND VERIFIED ANSWERS (A24B6)
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QUESTION 1 vc
Expanding a given microbial population allows researchers to do what?
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ANSWER
to detect and assess the microorganism more easily
vc vc vc vc vc vc vc
QUESTION 2 vc
What is Growth Media?
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ANSWER
Growth media is a liquid or solid formulated to support microbial growth.
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QUESTION 3 vc
What does Growth Media contain?
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ANSWER
The media contains essential nutrients to provide the microbe with a source of carbon/energy. The nutr
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ient composition often includes a rich source of sugars, amino acids and vitamins.
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QUESTION 4 vc
What else can Growth Media also be called?
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ANSWER
Such media can also be referred to as a nutrient broth and is commonly used to grow microbes in a sus
vc vc vc vc vc vc vc vc vc vc vc vc vc vc vc vc vc vc vc vc
pension.
,QUESTION 5 vc
Describe LB media vc vc
ANSWER
Perhaps the most common nutrient broth in the lab, LB media (lysogeny broth) is a nutritionally rich liq
vc vc vc vc vc vc vc vc vc vc vc vc vc vc vc vc vc
uid known for its ability to grow a vast array of microbes.
vc vc vc vc vc vc vc vc vc vc vc
QUESTION 6 vc
What is Selective Media? vc vc vc
ANSWER
Selective media allows for only the growth of certain microbes and, by extension, restricts the growth of
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all others.
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QUESTION 7 vc
How can Selective Media be accomplished?
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ANSWER
Such an approach can be accomplished in a variety of ways including: using limiting amounts of nutrien
vc vc vc vc vc vc vc vc vc vc vc vc vc vc vc vc
ts, varying degrees of pH (being either very acidic or very basic media), or various chemical additives th
vc vc vc vc vc vc vc vc vc vc vc vc vc vc vc vc vc
at limit unwanted microbial growth (i.e.) antibiotics.
vc vc vc vc vc vc
QUESTION 8 vc
Describe how Selective Media works with Gram-Positive versus Gram-Negative bacteria.
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ANSWER
If a plate is selective for Gram-Negative then it will only grow Gram-
vc vc vc vc vc vc vc vc vc vc vc vc
Negative bacteria on it. It will not grow Gram-Positive bacteria on it.
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QUESTION 9 vc
What is Differential Media?
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ANSWER
Differential media distinguishes between two, often related, microbes.
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QUESTION 10 vc
, What is one way that a Differential Media can distinguish between Escherichia coli and S
vc vc vc vc vc vc vc vc vc vc vc vc vc vc
almonella?
ANSWER
They are both Gram negative but can be distinguished by the presence (or absence) of lactose fermentat
vc vc vc vc vc vc vc vc vc vc vc vc vc vc vc vc
ion. If grown on the same differential media, E coli ferments lactose and turns the culture red. In contra
vc vc vc vc vc vc vc vc vc vc vc vc vc vc vc vc vc vc
st, Salmonella does not ferment lactose and the culture remains white/tan in color. (This above example
vc vc vc vc vc vc vc vc vc vc vc vc vc vc vc
is probably on MacConkey agar)
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QUESTION 11 vc
What is a fastidious microorganism?
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ANSWER
an organism with complex growth requirements such that if absent it will not grow
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QUESTION 12 vc
What are Enriched Medias used for?
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ANSWER
Enriched media is used to grow fastidious microorganisms
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QUESTION 13 vc
Enriched Medias contain what? vc vc vc
ANSWER
enriched medias contain the essential nutrients required for the growth of this subset of microorganism
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s
QUESTION 14 vc
Can a plate be a combination of selective, differential and enriched?
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ANSWER
Yes
QUESTION 15 vc
Growth Media comes in what 2 forms?
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ANSWER
