BIO 250 STRAIGHTERLINE MICROBIOLOGY GRADED
FINAL EXAM | QUESTIONS AND ANSWERS (LATEST
VERSION 2024
phylogeny - (ANSWER)The study of evolutionary relationships among organisms is called
______.
Last Universal Common Ancestor - (ANSWER)The three cell types discussed, eukaryotes,
archaea, and bacteria, all derived from ______.
always harmful to their host - (ANSWER)Organisms called parasites are ______.
Thermal hot springs warmed by heat from earth's interior - (ANSWER)Which of the following
does not indicate microbe involvement in energy and nutrient flow?
Electrons - (ANSWER)The subatomic particles that surround the nucleus are the ______.
respiratory disease - (ANSWER)The number one worldwide infectious diseases are ______.
saturated - (ANSWER)A fat is called _____ if all carbons of the fatty acid chain are single-
bonded to 2 other carbons and 2 hydrogens.
lipid - (ANSWER)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?
95X - (ANSWER)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?
, cell size of 0.5 to 2 microns - (ANSWER)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?
electron - (ANSWER)Which type of microscope achieves the greatest resolution and highest
magnification?
a solid medium - (ANSWER)Which of the following is produced by adding 1% to 5% agar to
nutrient broth that is then boiled and cooled?
Creutzfeldt-Jacob disease - (ANSWER)a spongiform encephalopathy of humans
amphitrichous - (ANSWER)The term that refers to flagella at both poles of the cell is ______.
saprobe - (ANSWER)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?
gram-negative - (ANSWER)During the Gram stain, the application of alcohol results in the
decolorization of ______ cells.
80s - (ANSWER)The size of a eukaryotic ribosome is ______
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. - (ANSWER)Sterilizing filters have a
pore size of 0.22 μm. Which of the following statements is true?
icosahedral - (ANSWER)One of the principal viral capsid shapes is a 20-sided figure with 12
evenly spaced corners referred to as a/an _____ capsid.
fecal oral - (ANSWER)Amoebic dysentery is most commonly contracted through
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