MICRO 290 Final Study Guide Questions || 100% Verified Answers.
Thermophilic correct answers - Microbes that can survive the heat of pasteurization
- Thermo- relating to heat
Pure (100%) alcohol is the most effective form of alcohol for use as an antimicrobial agent
correct answers - False
- The denaturation of proteins caused by alcohol requires the presence of water, so the most
effective antimicrobial forms of alcohol are 70% to 90% solutions
Which of the following methods will destroy bacterial endospores? correct answers -
Sterilization (Removal of all living microorganisms)
- Ex. Autoclave
__________ are infectious proteins that cannot be eliminated by standard sterilizing techniques.
correct answers - Prions
- Sustained heat for several hours at extremely high temperatures (900°F and above) will reliably
destroy a prions
Which of the following statements concerning microbial death is correct? correct answers - It can
be plotted on a semilogarithmic graph
- Rate of microbial death is generally constant for a given microbial species
Soaps and detergents are two common examples of chemicals known as correct answers -
Surfactants
,- Work by decreasing the surface attraction between water molecules.
Which of the following microbial control procedures creates pyrimidine dimers in DNA? correct
answers - Nonionizing radiation
Which of the following statements concerning autoclaving is CORRECT? correct answers -
Larger volumes require longer autoclaving times
-Water boil 121°C and under 15 psi of pressure
-For an item to be sterilized in an autoclave, steam must contact all of its surfaces
What microbe can't be killed by pasteurization? correct answers - Bacillus stearothermophilus
- Keyword is thermo, meaning heat loving
All of the following microbial control methods are bacteriostatic correct answers - Refrigeration
- Lyophilization: Or freeze drying is a process in which water is removed from a product after it
is frozen and placed under a vacuum
- Desiccation: Drying or the removal of moisture from something
Water that is boiling rapidly is a better disinfectant than water kept at a slow boil correct answers
- False
- No matter how much heat is applied to boiling water, it remains at the same temperature and
disinfects at the same rate.
, Which of the following items would typically be "sanitized"? correct answers - Restaurant
utensils
Antimicrobial agents that disrupt the cell membrane will also damage correct answers - The viral
envelope
A __________ solution of sugar or salt can preserve honey, jerky, jams, and pickles correct
answers - Hypertonic
- Ex. Seawater is hypertonic. If you place an animal or a plant cell in a hypertonic solution, the
cell shrinks, because it loses water
A(n) __________ is defined as an antimicrobial substance that is produced naturally by an
organism correct answers - Antibiotic
Sulfonamides are structural __________ of para-aminobenzoic acid (PABA) correct answers -
Analogs
- When you recall how an enzyme works, it must have a tight associated with its substrate.
Certain compounds can mimic the substrate and bind to the enzyme, effectively inhibiting it.
Some bacteria use antibacterial proteins called __________ to inhibit the growth of other
bacterial strains. correct answers - Bacteriocins
The smallest amount of an antimicrobial drug that will inhibit growth and reproduction of a
pathogen is expressed as the __________ correct answers - Minimum inhibitory concentration
A drug that is effective against a small number of pathogens is called a(n) correct answers -
Narrow spectrum drug
Thermophilic correct answers - Microbes that can survive the heat of pasteurization
- Thermo- relating to heat
Pure (100%) alcohol is the most effective form of alcohol for use as an antimicrobial agent
correct answers - False
- The denaturation of proteins caused by alcohol requires the presence of water, so the most
effective antimicrobial forms of alcohol are 70% to 90% solutions
Which of the following methods will destroy bacterial endospores? correct answers -
Sterilization (Removal of all living microorganisms)
- Ex. Autoclave
__________ are infectious proteins that cannot be eliminated by standard sterilizing techniques.
correct answers - Prions
- Sustained heat for several hours at extremely high temperatures (900°F and above) will reliably
destroy a prions
Which of the following statements concerning microbial death is correct? correct answers - It can
be plotted on a semilogarithmic graph
- Rate of microbial death is generally constant for a given microbial species
Soaps and detergents are two common examples of chemicals known as correct answers -
Surfactants
,- Work by decreasing the surface attraction between water molecules.
Which of the following microbial control procedures creates pyrimidine dimers in DNA? correct
answers - Nonionizing radiation
Which of the following statements concerning autoclaving is CORRECT? correct answers -
Larger volumes require longer autoclaving times
-Water boil 121°C and under 15 psi of pressure
-For an item to be sterilized in an autoclave, steam must contact all of its surfaces
What microbe can't be killed by pasteurization? correct answers - Bacillus stearothermophilus
- Keyword is thermo, meaning heat loving
All of the following microbial control methods are bacteriostatic correct answers - Refrigeration
- Lyophilization: Or freeze drying is a process in which water is removed from a product after it
is frozen and placed under a vacuum
- Desiccation: Drying or the removal of moisture from something
Water that is boiling rapidly is a better disinfectant than water kept at a slow boil correct answers
- False
- No matter how much heat is applied to boiling water, it remains at the same temperature and
disinfects at the same rate.
, Which of the following items would typically be "sanitized"? correct answers - Restaurant
utensils
Antimicrobial agents that disrupt the cell membrane will also damage correct answers - The viral
envelope
A __________ solution of sugar or salt can preserve honey, jerky, jams, and pickles correct
answers - Hypertonic
- Ex. Seawater is hypertonic. If you place an animal or a plant cell in a hypertonic solution, the
cell shrinks, because it loses water
A(n) __________ is defined as an antimicrobial substance that is produced naturally by an
organism correct answers - Antibiotic
Sulfonamides are structural __________ of para-aminobenzoic acid (PABA) correct answers -
Analogs
- When you recall how an enzyme works, it must have a tight associated with its substrate.
Certain compounds can mimic the substrate and bind to the enzyme, effectively inhibiting it.
Some bacteria use antibacterial proteins called __________ to inhibit the growth of other
bacterial strains. correct answers - Bacteriocins
The smallest amount of an antimicrobial drug that will inhibit growth and reproduction of a
pathogen is expressed as the __________ correct answers - Minimum inhibitory concentration
A drug that is effective against a small number of pathogens is called a(n) correct answers -
Narrow spectrum drug
