Microbiology 290 - Microbiology » Spring 2022 » Week 2-1
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Question #1
Which of the following is one-billionth of a meter?
A.
a nanometer
B.
a centimeter
C.
a millimeter
D.
a micrometer
Question #2
Which of the following types of microscopes can magnify more than 2000×?
A.
a phase-contrast microscope
B.
a bright-field microscope
C.
a transmission electron microscope
D.
a dark-field microscope
Question #3
A scientist is using an objective lens with 40× magnification on his microscope. If the ocular lens magnifies 10×, what is the total magnification being used to visualize the specimen?
A.
50×
B.
400×
C.
4000×
D.
40×
Question #4
If you needed to look at the fine details of the interior of a virus, which microscope would you use?
A.
scanning tunneling microscope
B.
fluorescent microscope
C.
transmission electron microscope
D.
bright-field microscope
Question #5
A thin film of microorganisms on a slide is called a __________.
A.
smear
B.
stain
C.
biofilm
D.
mordant
Question #6
The reagents crystal violet, iodine, and safranin are all associated with which of the following staining procedures?
A.
the endospore stain
B.
the acid-fast stain
C.
the Gram stain
D.
the flagella stain
Question #7
A microbiologist is using heat to drive the stain carbolfuchsin into a smear. Which of the following staining procedures is the microbiologist using?
A.
the flagella stain
B.
the Gram stain
C.
the capsule stain
D.
the acid-fast stain
Question #8
How is fermentation of lactose detected?
A.
The cells form a black precipitant.
B.
The drop in pH turns the indicator dye yellow.
C.
The acetoin produced turns the medium pink.
D.
The medium become turbid when exposed to air.
Question #9
Why is visualization not sufficient to properly identify bacteria?
A.
Many unrelated bacteria can share the same shape.
B.
Bacteria have a limited set of shapes.
C.
Not all bacteria can be seen with a light microscope.
D.
Bacteria have a limited set of shapes and many unrelated bacteria share the same shape.
E.
Identification is only needed in clinical specimens.
Question #10
What is the hallmark of dichotomous keys?
A.
They only relate to biochemical processes of the cell.
B.
They consist of a series of paired statements, in which only one statement of each pair applies to a given organism.
C.
They only relate to the shape of the cell.
D.
They are open-ended questions.
Question #11
Biochemical tests _________________.
A.
are used to determine rate of growth
B.
are the main methods used to identify unknown bacteria
C.
are visualized using microscopes
D.
are the most effective way to determine bacterial shape
Question #12
Taxonomy consists of all of the following activities EXCEPT __________.
A.
identification
B.
staining microorganisms
C.
nomenclature
D.
grouping organisms
Question #13
Which of the following groups of organisms belongs in the domain Eukarya?
A.
archaea
B.
bacteria
C.
protozoa
D.
viruses
Question #14
What was Leeuwenhoek's contribution to the science of microbiology?
A.
He developed the vaccine for smallpox.
B.
He did experiments supporting the idea of spontaneous generation.
C.
He was the first to observe live microorganisms through a microscope.
D.
He discovered some of the ways in which microbes can be transmitted between individuals.
Question #15
A microorganism has the following characteristics: eukaryotic, multicellular, has cell walls, and grows in long filaments. What is its general classification?
A.
parasitic worm
B.
fungus
C.
bacterium
D.
protozoan
Question #16
Microbiologists study parasitic worms because __________.
A.
they are microscopic as adults
B.
they usually contain bacteria and other microbes
C.
they were not studied by early microbiologists
D.
they cause diseases that are diagnosed by finding microscopic eggs in clinical specimens
Question #17
All of the following individuals showed that cleanliness played a role in human disease EXCEPT __________.
A.
Lister
B.
Semmelweis
C.
Nightingale
D.
Jenner
Question #18
Spallanzani's experiments concerning spontaneous generation were NOT universally accepted because __________.
A.
he did not give proper credit to Needham for his experiments
B.
he eliminated air from his flasks by sealing them
C.
he did not heat his infusion flasks long enough
D.
he did not know which bacteria were growing in his flasks
Question #19
Whose experiments supported the existence of a "life force"?
A.
Needham
B.
Spallanzani
C.
Redi
D.
Pasteur
Question #20
Which of the following is NOT a growing area of microbial study?
A.
ultraminiature technology
B.
communication within biofilms
C.
methods of disease transmission
D.
reducing antimicrobial resistance
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