MCB 101 final exam UIUC UPDATED ACTUAL Questions And Correct Answers
C
Terms in this set (78)
In Experiment 17: Milk Pasteurization, we used 3M 1.0 ml
Petrifilm cultures to count the bacteria in the diluted meat
samples. What volume of liquid is used to inoculate a 3M
Petrifilm culture?
A sewage sample is tested for coliform bacteria by 9.0 x 10
spreading aliquots on standard Petri dish cultures of EMB
agar. After incubation the dark purple-green colored
coliform colonies are counted. A 0.10 ml aliquot of a 1 x
10-4 dilution of the sample gives 90 coliform colonies.
What is the concentration of coliform bacteria in this
sample of sewage? (the units are: cells/ml)
Which one of the following statements about bacteria . Staphylococcus aureus is a Gram negative rod shaped bacteria that is found
that cause foodborne illness primarily
is false? in animal intestines, it is an obligate anaerobe that produces a neurotoxin called
botox.
On a 3M Petrifilm culture for E. coli/coliforms, such as blue and associated with a gas bubble.
those we used in
Experiment 17(Pasteurization of Milk), a colony of a fecal
coliform appears:
In experiment 17 we killed E. coli bacteria in milk by 63C or 145F
heating the milk at:
What is the term for microorganisms that can grow and psychrophillic
cause food spoilage in the
refrigerator?
, What type of microorganism is Penicillium? Fungus
The food preservative sodium nitrite is: an inhibitor of pyruvate-ferrodoxin oxidoreductase.
Nitrites are added to meat because it gives meat a pink Clostridium botulinum
color and inhibits:
How do propionate and benzoate prevent microbial They increase the proton concentration of the cytoplasm in microbes.
growth?
Which one of the following substances is not classified as . tetracycline
a disinfectant?
An antiseptic is: . an antimicrobial substance that is used to kill or inhibit microorganisms on the
skin.
Which two of the following statements about -Phenol was used as a disinfectant in hospitals for many years.
disinfectants and antiseptics are true? -Chemical disinfectants are more lethal to bacteria at higher concentrations.
Which one of the following statements about lactic acid Oxygen is needed for fermentation reactions to take place.
and ethanol fermentations
is false?
Yogurt production primarily involves: the fermentation of a sugar to produce lactic acid.
Which two of the following bacteria are used to make -Lactobacillus bulgaricus
yogurt? -Streptococcus thermophilus
Experiment 18b: Yogurt Production -The incubation temperature for the yogurt culture is 43-45oC
Which two of the following statements about setting up a -The production of yogurt is an example of a microbial succession that primarily
yogurt culture are true? involves two species of bacteria.
Which one of the following statements about making Rennet contains a proteolytic enzyme that cleaves a specific peptide bond in κ-
cottage cheese is true? casein.
You set up a ten-tube Minimum Inhibitory Concentration 100 μg/ml
test where the concentration of the antibiotic in each
tube is a 1/2 dilution of the previous tube. If the
concentration of the antibiotic in tube 1 is 3200
micrograms per ml. What is the concentration of the
antibiotic in tube 6?
Redox Reactions Involving Nitrogenous Compounds -nitrite is converted to nitrate
Which two of the following chemical changes are -ammonia is converted to nitrite
oxidation reactions?
Which one of the following statements about the The oxidation of ammonia to nitrate is called denitrification.
nitrogen cycle is false?
C
Terms in this set (78)
In Experiment 17: Milk Pasteurization, we used 3M 1.0 ml
Petrifilm cultures to count the bacteria in the diluted meat
samples. What volume of liquid is used to inoculate a 3M
Petrifilm culture?
A sewage sample is tested for coliform bacteria by 9.0 x 10
spreading aliquots on standard Petri dish cultures of EMB
agar. After incubation the dark purple-green colored
coliform colonies are counted. A 0.10 ml aliquot of a 1 x
10-4 dilution of the sample gives 90 coliform colonies.
What is the concentration of coliform bacteria in this
sample of sewage? (the units are: cells/ml)
Which one of the following statements about bacteria . Staphylococcus aureus is a Gram negative rod shaped bacteria that is found
that cause foodborne illness primarily
is false? in animal intestines, it is an obligate anaerobe that produces a neurotoxin called
botox.
On a 3M Petrifilm culture for E. coli/coliforms, such as blue and associated with a gas bubble.
those we used in
Experiment 17(Pasteurization of Milk), a colony of a fecal
coliform appears:
In experiment 17 we killed E. coli bacteria in milk by 63C or 145F
heating the milk at:
What is the term for microorganisms that can grow and psychrophillic
cause food spoilage in the
refrigerator?
, What type of microorganism is Penicillium? Fungus
The food preservative sodium nitrite is: an inhibitor of pyruvate-ferrodoxin oxidoreductase.
Nitrites are added to meat because it gives meat a pink Clostridium botulinum
color and inhibits:
How do propionate and benzoate prevent microbial They increase the proton concentration of the cytoplasm in microbes.
growth?
Which one of the following substances is not classified as . tetracycline
a disinfectant?
An antiseptic is: . an antimicrobial substance that is used to kill or inhibit microorganisms on the
skin.
Which two of the following statements about -Phenol was used as a disinfectant in hospitals for many years.
disinfectants and antiseptics are true? -Chemical disinfectants are more lethal to bacteria at higher concentrations.
Which one of the following statements about lactic acid Oxygen is needed for fermentation reactions to take place.
and ethanol fermentations
is false?
Yogurt production primarily involves: the fermentation of a sugar to produce lactic acid.
Which two of the following bacteria are used to make -Lactobacillus bulgaricus
yogurt? -Streptococcus thermophilus
Experiment 18b: Yogurt Production -The incubation temperature for the yogurt culture is 43-45oC
Which two of the following statements about setting up a -The production of yogurt is an example of a microbial succession that primarily
yogurt culture are true? involves two species of bacteria.
Which one of the following statements about making Rennet contains a proteolytic enzyme that cleaves a specific peptide bond in κ-
cottage cheese is true? casein.
You set up a ten-tube Minimum Inhibitory Concentration 100 μg/ml
test where the concentration of the antibiotic in each
tube is a 1/2 dilution of the previous tube. If the
concentration of the antibiotic in tube 1 is 3200
micrograms per ml. What is the concentration of the
antibiotic in tube 6?
Redox Reactions Involving Nitrogenous Compounds -nitrite is converted to nitrate
Which two of the following chemical changes are -ammonia is converted to nitrite
oxidation reactions?
Which one of the following statements about the The oxidation of ammonia to nitrate is called denitrification.
nitrogen cycle is false?
