BIO 2710 TEST WITH VERIFIED
SOLUTIONS
In the process of _______, microbes detect the presence and density of other microbes and
modify their metabolic activity in response.
A) quorum sensing
B) antagonism
C) mutualism
D) symbiosis
E) synergy ✔️✔️quorum sensing
Which of the following methods provides information about the number of living cells in a
sample of bacterial culture?
A) serial dilution and viable plate count
B) membrane filtration
C) a Petroff-Hauser counting chamber
D) flow cytometry
E) a coulter counter ✔️✔️serial dilution and viable plate count
The use of salt and sugar in preserving various types of foods is an application of which of the
following concepts?
A) nitrogen fixation
B) osmotic pressure
,C) pH
D) hydrostatic pressure
E) quorum sensing ✔️✔️osmotic pressure
Blood agar plates are an example of ____ medium
A) differential
B) selective
C) reducing
D) defined
E) transport ✔️✔️differential
Which of the following is a fermentation product useful in the manufacture of cheese?
A) acetic acid
B) ammonia
C) ethanol
D) lactic acid
E) pyruvic acid ✔️✔️lactic acid
Salts and sugars used in food preservation provide a ______ environment whereby solutes draw
water out of microbial cells, preventing their growth and reproduction.
A) Hyerptonic
B) Hypotonic
C) Isotonic
, D) Osmotic ✔️✔️Hypertonic
Which of the following statements provides the definition of sterilization?
A) Eliminates organisms and their spores or endospores
B) Eliminates harmful microorganisms and viruses
C) Eliminates prions
D) Eliminates hypertheromphiles ✔️✔️Eliminates organisms and their spores or endospores
Which of the following terms best describes the elimination of microbes from cafeteria plates in
a commercial dishwashing machine along with the use of heat and dishwashing powder
containing chlorine?
A) Pasteurization
B) Antispesis
C) Sterilization
D) Disinfection ✔️✔️Disinfection
Washing dishes in the dishwasher with detergent and hot water is a _______ process.
A) antiseptic
B) disinfecting
C) sterilizing
D) sanitizing
E) degerming ✔️✔️Sanitizing
SOLUTIONS
In the process of _______, microbes detect the presence and density of other microbes and
modify their metabolic activity in response.
A) quorum sensing
B) antagonism
C) mutualism
D) symbiosis
E) synergy ✔️✔️quorum sensing
Which of the following methods provides information about the number of living cells in a
sample of bacterial culture?
A) serial dilution and viable plate count
B) membrane filtration
C) a Petroff-Hauser counting chamber
D) flow cytometry
E) a coulter counter ✔️✔️serial dilution and viable plate count
The use of salt and sugar in preserving various types of foods is an application of which of the
following concepts?
A) nitrogen fixation
B) osmotic pressure
,C) pH
D) hydrostatic pressure
E) quorum sensing ✔️✔️osmotic pressure
Blood agar plates are an example of ____ medium
A) differential
B) selective
C) reducing
D) defined
E) transport ✔️✔️differential
Which of the following is a fermentation product useful in the manufacture of cheese?
A) acetic acid
B) ammonia
C) ethanol
D) lactic acid
E) pyruvic acid ✔️✔️lactic acid
Salts and sugars used in food preservation provide a ______ environment whereby solutes draw
water out of microbial cells, preventing their growth and reproduction.
A) Hyerptonic
B) Hypotonic
C) Isotonic
, D) Osmotic ✔️✔️Hypertonic
Which of the following statements provides the definition of sterilization?
A) Eliminates organisms and their spores or endospores
B) Eliminates harmful microorganisms and viruses
C) Eliminates prions
D) Eliminates hypertheromphiles ✔️✔️Eliminates organisms and their spores or endospores
Which of the following terms best describes the elimination of microbes from cafeteria plates in
a commercial dishwashing machine along with the use of heat and dishwashing powder
containing chlorine?
A) Pasteurization
B) Antispesis
C) Sterilization
D) Disinfection ✔️✔️Disinfection
Washing dishes in the dishwasher with detergent and hot water is a _______ process.
A) antiseptic
B) disinfecting
C) sterilizing
D) sanitizing
E) degerming ✔️✔️Sanitizing
