Microbiology Exam 2 Questions with 100% Correct Answers Latest
Graded A+
Question:
the terminal electron acceptor in aerobic respiration is water, which is broken to hydrogen and
oxygen
Answer:
False
Question:
The product of ATP via the electron transport system, in either eukaryotes or prokaryotes, requires
the use of a membrane.
Answer:
True
Question:
Tetrathionate broth is an enrichment medium. Initially, when a mixed bacterial stool sample is
inoculated into this medium, the bacteria respire aerobically. Once O2 is depleted, most bacteria
switch to fermentation in order to continue growth, However, Salmonella can use the tetrathionate
in this medium as a terminal electron acceptor, so can grow anaerobically. why does this give the
bacteria a competitive advantage over other bacteria in the sample?
Answer:
Anaerobic respiration yields more ATP than fermentation
Question:
Consider the tube shown below. What type of organism would grow in the middle of the tube?
Answer:
Microaerophile
Question:
Eosin methylene blue agar (EMB) is a selective and differential medium. The dyes on the medium
inhibit most Gram-positive organisms. Gram-negative organisms such as the coliforms grow on
this medium. Coliforms that are fecal in origin produce colonies with a metallic green color on
EMB, while those that are non- fecal produce colorless colonies. You plate a urine sample onto an
, EMB plate and incubate it. Metallic green colonies develop. From this, you can conclude that:
Answer:
the sample contains bacteria that are Gram-negative AND are fecal in origin.
Question:
Please select the FALSE statement regarding the central metabolic pathways:
Answer:
the transition step and TCA cycle are repeated four times to yield ATP, reducing power, and three
different precursor metabolites.
Question:
a cluster of cases of legionellosis have occurred in your neighborhood. people with the illness have
cough, fever, shortness of breath, chest pain and sometimes diarrhea. the illness caused by the
bacterium 'legionella pneumophilia', a facultative intracellular parasite that survives in certain
ameba. the organism has an absolute requirement for L-cysteine. Diagnosis of legionellosis
depends partly on culture of the causative agent from the medical samples. what essential
component must this medium have to ensure growth of L. pneumophilia?
Answer:
cysteine
Question:
A halophilic, aerobic mesophile has a generation time of 20 minutes. you place 10,000 of these
organisms on an appropriate solid medium, and incubate the plate for 100 minutes. Select the
FALSE statement:
Answer:
after incubation, a colony on the plate contains 5,000 cells.
Question:
an alkaliophilic bacterium is one that grows in an environment where
Answer:
the pH is above 9
Question:
what is true regarding the three central metabolic pathways?
Graded A+
Question:
the terminal electron acceptor in aerobic respiration is water, which is broken to hydrogen and
oxygen
Answer:
False
Question:
The product of ATP via the electron transport system, in either eukaryotes or prokaryotes, requires
the use of a membrane.
Answer:
True
Question:
Tetrathionate broth is an enrichment medium. Initially, when a mixed bacterial stool sample is
inoculated into this medium, the bacteria respire aerobically. Once O2 is depleted, most bacteria
switch to fermentation in order to continue growth, However, Salmonella can use the tetrathionate
in this medium as a terminal electron acceptor, so can grow anaerobically. why does this give the
bacteria a competitive advantage over other bacteria in the sample?
Answer:
Anaerobic respiration yields more ATP than fermentation
Question:
Consider the tube shown below. What type of organism would grow in the middle of the tube?
Answer:
Microaerophile
Question:
Eosin methylene blue agar (EMB) is a selective and differential medium. The dyes on the medium
inhibit most Gram-positive organisms. Gram-negative organisms such as the coliforms grow on
this medium. Coliforms that are fecal in origin produce colonies with a metallic green color on
EMB, while those that are non- fecal produce colorless colonies. You plate a urine sample onto an
, EMB plate and incubate it. Metallic green colonies develop. From this, you can conclude that:
Answer:
the sample contains bacteria that are Gram-negative AND are fecal in origin.
Question:
Please select the FALSE statement regarding the central metabolic pathways:
Answer:
the transition step and TCA cycle are repeated four times to yield ATP, reducing power, and three
different precursor metabolites.
Question:
a cluster of cases of legionellosis have occurred in your neighborhood. people with the illness have
cough, fever, shortness of breath, chest pain and sometimes diarrhea. the illness caused by the
bacterium 'legionella pneumophilia', a facultative intracellular parasite that survives in certain
ameba. the organism has an absolute requirement for L-cysteine. Diagnosis of legionellosis
depends partly on culture of the causative agent from the medical samples. what essential
component must this medium have to ensure growth of L. pneumophilia?
Answer:
cysteine
Question:
A halophilic, aerobic mesophile has a generation time of 20 minutes. you place 10,000 of these
organisms on an appropriate solid medium, and incubate the plate for 100 minutes. Select the
FALSE statement:
Answer:
after incubation, a colony on the plate contains 5,000 cells.
Question:
an alkaliophilic bacterium is one that grows in an environment where
Answer:
the pH is above 9
Question:
what is true regarding the three central metabolic pathways?
