MIC 205 FINAL EXAM QUESTIONS AND ANSWERS
WITH COMPLETE SOLUTION!!
Which of the following bacterial species are capable of converting nitrogen gas
in the atmosphere into compounds that other organisms can better utilize?
Answer - Rhizobium spp. : gram -, fix nitrogen
Of the bacterial species listed below, which do not utilize type IV secretion to
transfer DNA or proteins into eukaryotic cells? Answer - Neisseria gonorrhoeae
Type V secretion
After graduating from the University of Arizona you decided to become a
benthic marine biologist (studying the sea floor). Your have been using large
dragnets to collect sea floor marine life. In your first net you see a new species
of anglerfish. These fish have a light organ protruding in front of their mouth
that is used to attract prey fish in the dark depths of the ocean. You suspect
that the light organ will contain bacteria. What species from the list below do
you suspect is most likely to have colonized the light organ? Answer -
(Alii)Vibrio fischeri - Aliivibrio fisheri; produce visible light at high bacterial
concentrations.
Hans Christian Gram is famous for developing a staining technique that
separates pathogenic bacteria into two roughly equal sized groups. He
originally developed this technique to differentiate two bacteria (one a bacillus
and one a coccus) that were causing the same disease. Which of the bacteria
below was the bacillus in his samples? Answer - Klebsiella pneumoniae :
bacillus
,The one thing you learned by your summer at sea (question #3) is that you do
not like water. You decided to return to the arid lands of Arizona where rivers
only have water flowing in them a few weeks out of the year. As fortune would
have it, you have been accepted into the UofA medical school. In your surgical
rotation you will be learning under the tutelage of Dr. Yavan Knowsomuch. On
the first day with her, Dr. Knowsomuch offhandedly remarks that her patients
keep developing colitis after they are discharged from her care. What species of
bacteria do you suspect is causing these symptoms? Answer - Clostridium
difficile :colitis is a chronic, inflammatory bowel disease
Robert Koch was one of the scientists in the late 19th century involved in
developing the Germ Theory. This theory states that diseases are caused by
microscopic organisms. Dr. Koch's lasting contribution to this theory was a
systematic approach for identifying the microbial cause of a disease. We call
this approach Koch's Postulates. What were the declarative statements?
Answer - a. You must find the microbe in all cases of the disease.
b. You must be able to grow the microbe in a pure culture.
c. The pure culture must be able to cause the same disease in a new individual.
d. You must be able to re-isolate the original organism from individual infected
in part C.
True or False - Koch's Postulates have been used to show that all known
diseases are microbial in origin. Answer - False: Not known, only a method to
prove what causes disease. Not all diseases are microbial in origin; example:
genetic diseases.
Which scientist is remembered for having developed the first microscope that
could resolve microorganisms? Lecture Answer - Dr. Antonie van
Leeuwenhoek: compound microscope
Which domain of life contains microorganisms Answer - a. Eubacteria
b. Eukaryotes
,c. Archaea
True or False - The human body contains 10 times more prokaryotic cells than
eukaryotic cells. Answer - True: We have more microorganisms on our bodies
than our own cells.
Clostridium botulinum is a Gram-positive spore-forming bacterium that
produces a toxin that can block the release of neurotransmitters from human
neurons. The purified toxin has been shown to be useful in the treatment of
which of the following diseases:
A. Aging
b. Diarrhea
c. The flu
d. Alcoholism
e. Botox will not prevent or treat any of these diseases Answer - e. Botox will
not prevent or treat any of these diseases
I am sure you took the time to study osmosis. Here is your chance to be
rewarded. What would happen to a bacterial cell if you placed it in an isotonic
solution? Answer - Nothing would happen to the bacterial cell. because of cell
wall
Which of the following statements best characterizes the role of ATP in active
transport? Answer - ATP hydrolysis generates the energy to move a compound
from a low concentration outside the cell into the high concentration inside the
cell
When cyanobacteria first evolved photosynthesis (about 2.3 billion years ago),
they killed off most life on earth. What metabolic byproduct of cyanobacteria
, photosynthesis killed off most of the other organisms? Answer - Oxygen gas
(O2)
Which of the following statements about the bacterial glycocalyx is correct?
Lecture 3 Slide 24-25
a. Some bacteria, including Klebsiella pneumoniae, have a highly organized
glycocalyx - capsule - that can function to protect the bacteria from the host
immune system.
b. Some bacteria secrete protein via the glycocalyx complex between the inner
and outer membrane.
c. Some bacteria utilize the glycocalyx for a type motility known as twitching
motility
d. All of the above are correct statements about bacterial glycocalyx. Answer -
d. All of the above are correct statements about bacterial glycocalyx.
What is the fate of the mother cell during bacterial sporulation after the
endospore is released? Answer - The mother cell is sacrificed in order to allow
the endospore to escape.
What is the process of bacterial communication by which bacteria are able to
determine the number of proximal microorganisms? Answer - Quorum sensing
Which of the following statements about the central dogma is not correct?
Lecture 4 slide 11
a. DNA stores information to direct protein synthesis and passes that
information from generation to generation.
b. RNA is a less stable intermediary that forms a template for protein synthesis.
WITH COMPLETE SOLUTION!!
Which of the following bacterial species are capable of converting nitrogen gas
in the atmosphere into compounds that other organisms can better utilize?
Answer - Rhizobium spp. : gram -, fix nitrogen
Of the bacterial species listed below, which do not utilize type IV secretion to
transfer DNA or proteins into eukaryotic cells? Answer - Neisseria gonorrhoeae
Type V secretion
After graduating from the University of Arizona you decided to become a
benthic marine biologist (studying the sea floor). Your have been using large
dragnets to collect sea floor marine life. In your first net you see a new species
of anglerfish. These fish have a light organ protruding in front of their mouth
that is used to attract prey fish in the dark depths of the ocean. You suspect
that the light organ will contain bacteria. What species from the list below do
you suspect is most likely to have colonized the light organ? Answer -
(Alii)Vibrio fischeri - Aliivibrio fisheri; produce visible light at high bacterial
concentrations.
Hans Christian Gram is famous for developing a staining technique that
separates pathogenic bacteria into two roughly equal sized groups. He
originally developed this technique to differentiate two bacteria (one a bacillus
and one a coccus) that were causing the same disease. Which of the bacteria
below was the bacillus in his samples? Answer - Klebsiella pneumoniae :
bacillus
,The one thing you learned by your summer at sea (question #3) is that you do
not like water. You decided to return to the arid lands of Arizona where rivers
only have water flowing in them a few weeks out of the year. As fortune would
have it, you have been accepted into the UofA medical school. In your surgical
rotation you will be learning under the tutelage of Dr. Yavan Knowsomuch. On
the first day with her, Dr. Knowsomuch offhandedly remarks that her patients
keep developing colitis after they are discharged from her care. What species of
bacteria do you suspect is causing these symptoms? Answer - Clostridium
difficile :colitis is a chronic, inflammatory bowel disease
Robert Koch was one of the scientists in the late 19th century involved in
developing the Germ Theory. This theory states that diseases are caused by
microscopic organisms. Dr. Koch's lasting contribution to this theory was a
systematic approach for identifying the microbial cause of a disease. We call
this approach Koch's Postulates. What were the declarative statements?
Answer - a. You must find the microbe in all cases of the disease.
b. You must be able to grow the microbe in a pure culture.
c. The pure culture must be able to cause the same disease in a new individual.
d. You must be able to re-isolate the original organism from individual infected
in part C.
True or False - Koch's Postulates have been used to show that all known
diseases are microbial in origin. Answer - False: Not known, only a method to
prove what causes disease. Not all diseases are microbial in origin; example:
genetic diseases.
Which scientist is remembered for having developed the first microscope that
could resolve microorganisms? Lecture Answer - Dr. Antonie van
Leeuwenhoek: compound microscope
Which domain of life contains microorganisms Answer - a. Eubacteria
b. Eukaryotes
,c. Archaea
True or False - The human body contains 10 times more prokaryotic cells than
eukaryotic cells. Answer - True: We have more microorganisms on our bodies
than our own cells.
Clostridium botulinum is a Gram-positive spore-forming bacterium that
produces a toxin that can block the release of neurotransmitters from human
neurons. The purified toxin has been shown to be useful in the treatment of
which of the following diseases:
A. Aging
b. Diarrhea
c. The flu
d. Alcoholism
e. Botox will not prevent or treat any of these diseases Answer - e. Botox will
not prevent or treat any of these diseases
I am sure you took the time to study osmosis. Here is your chance to be
rewarded. What would happen to a bacterial cell if you placed it in an isotonic
solution? Answer - Nothing would happen to the bacterial cell. because of cell
wall
Which of the following statements best characterizes the role of ATP in active
transport? Answer - ATP hydrolysis generates the energy to move a compound
from a low concentration outside the cell into the high concentration inside the
cell
When cyanobacteria first evolved photosynthesis (about 2.3 billion years ago),
they killed off most life on earth. What metabolic byproduct of cyanobacteria
, photosynthesis killed off most of the other organisms? Answer - Oxygen gas
(O2)
Which of the following statements about the bacterial glycocalyx is correct?
Lecture 3 Slide 24-25
a. Some bacteria, including Klebsiella pneumoniae, have a highly organized
glycocalyx - capsule - that can function to protect the bacteria from the host
immune system.
b. Some bacteria secrete protein via the glycocalyx complex between the inner
and outer membrane.
c. Some bacteria utilize the glycocalyx for a type motility known as twitching
motility
d. All of the above are correct statements about bacterial glycocalyx. Answer -
d. All of the above are correct statements about bacterial glycocalyx.
What is the fate of the mother cell during bacterial sporulation after the
endospore is released? Answer - The mother cell is sacrificed in order to allow
the endospore to escape.
What is the process of bacterial communication by which bacteria are able to
determine the number of proximal microorganisms? Answer - Quorum sensing
Which of the following statements about the central dogma is not correct?
Lecture 4 slide 11
a. DNA stores information to direct protein synthesis and passes that
information from generation to generation.
b. RNA is a less stable intermediary that forms a template for protein synthesis.
