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Exam (elaborations) Straighterline Microbiology
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Straighterline MicrobiologyFinal Exam 2024 Questions
With 100% Correct Answers
,The study of evolutionary relationships among organisms is called ______. - CORRECT
ANSWERS-phylogeny
The three cell types discussed, eukaryotes, archaea, and bacteria, all derived from
______. - CORRECT ANSWERS-Last Universal Common Ancestor
Organisms called parasites are ______. - CORRECT ANSWERS-always harmful to
their host
Which of the following does not indicate microbe involvement in energy and nutrient
flow? - CORRECT ANSWERS-Thermal hot springs warmed by heat from earth's interior
The subatomic particles that surround the nucleus are the ______. - CORRECT
ANSWERS-Electrons
The number one worldwide infectious diseases are ______. - CORRECT ANSWERS-
respiratory disease
A fat is called _____ if all carbons of the fatty acid chain are single-bonded to 2 other
carbons and 2 hydrogens. - CORRECT ANSWERS-saturated
One technique for staining bacteria for viewing under the microscope is called the Gram
stain. In this technique, alcohol is used as a decolorizer because it degrades the outer
membrane found in some bacteria. What chemical component of the cell does alcohol
affect? - CORRECT ANSWERS-lipid
If a microbiologist is studying a specimen at a total magnification of 950X, what is the
magnifying power of the objective lens if the ocular lens is 10X? - CORRECT
ANSWERS-95X
, NASA has published a list of criteria for identifying fossil bacteria in samples from Mars,
as part of a search for evidence of life. Which of the following is good evidence for the
presence of bacterial cells? - CORRECT ANSWERS-cell size of 0.5 to 2 microns
Which type of microscope achieves the greatest resolution and highest magnification? -
CORRECT ANSWERS-electron
Which of the following is produced by adding 1% to 5% agar to nutrient broth that is
then boiled and cooled? - CORRECT ANSWERS-a solid medium
a spongiform encephalopathy of humans - CORRECT ANSWERS-Creutzfeldt-Jacob
disease
The term that refers to flagella at both poles of the cell is ______. - CORRECT
ANSWERS-amphitrichous
In the condition called athlete's foot, the fungus Trichophyton consumes the keratin
protein found in hair, nails, and dead skin. Which of the following descriptors does not
apply to Trichophyton? - CORRECT ANSWERS-saprobe
During the Gram stain, the application of alcohol results in the decolorization of ______
cells. - CORRECT ANSWERS-gram-negative
The size of a eukaryotic ribosome is ______ - CORRECT ANSWERS-80s
Sterilizing filters have a pore size of 0.22 μm. Which of the following statements is true?
- CORRECT ANSWERS-Bacterial cells are typically between 1-10 μm and are blocked
by the filter, whereas most viruses are between 20 and 200 nm and therefore pass
through.
One of the principal viral capsid shapes is a 20-sided figure with 12 evenly spaced
corners referred to as a/an _____ capsid. - CORRECT ANSWERS-icosahedral
Amoebic dysentery is most commonly contracted through - CORRECT ANSWERS-
fecal oral
the viral genome inserting into bacterial host chromosome - CORRECT ANSWERS-
lysogeny
Which of the following is not associated with every virus? - CORRECT ANSWERS-
envelope
When bacilli in a chain fold back upon each other like a hinge, this cellular arrangement
is termed a ______. - CORRECT ANSWERS-palisade
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