STRAIGHTERLINE MICRO 250 PROCTORED
EXAM 2026 AND PRACTICE QUESTIONS AND
CORRECT DETAILED ANSWERS VERIFIED
ANSWERS ALREADY GRADED A PLUS
◉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
, ◉lysogeny. Answer: the viral genome inserting into bacterial host
chromosome
◉envelope. Answer: Which of the following is not associated with
every virus?
◉palisade. Answer: When bacilli in a chain fold back upon each other
like a hinge, this cellular arrangement is termed a ______.
◉histones. Answer: proteins associated with DNA in the nucleus.
◉tropisms. Answer: Viral tissue specificities are called ______.
◉lophotrichous. Answer: the term that refers to the presence of a tuft of
flagella emerging from a single site is ______.
◉mutualistic. Answer: E. coli bacteria normally live in the human gut
and produce vitamin K that the body uses. This is best termed a ______
relationship.
◉mutualistic. Answer: Termites are insects that require the protozoan
Trichonympha in their gut to synthesize the enzyme cellulase to degrade
EXAM 2026 AND PRACTICE QUESTIONS AND
CORRECT DETAILED ANSWERS VERIFIED
ANSWERS ALREADY GRADED A PLUS
◉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
, ◉lysogeny. Answer: the viral genome inserting into bacterial host
chromosome
◉envelope. Answer: Which of the following is not associated with
every virus?
◉palisade. Answer: When bacilli in a chain fold back upon each other
like a hinge, this cellular arrangement is termed a ______.
◉histones. Answer: proteins associated with DNA in the nucleus.
◉tropisms. Answer: Viral tissue specificities are called ______.
◉lophotrichous. Answer: the term that refers to the presence of a tuft of
flagella emerging from a single site is ______.
◉mutualistic. Answer: E. coli bacteria normally live in the human gut
and produce vitamin K that the body uses. This is best termed a ______
relationship.
◉mutualistic. Answer: Termites are insects that require the protozoan
Trichonympha in their gut to synthesize the enzyme cellulase to degrade
