portage microbiology module 3 Exam
Questions and Answers with Verified
Solutions | Latest Updated 2026
microscopy the use of light or electrons to magnify
objects
to measure an object, the unit smaller scale than the object itself
must
be
used to measure the size of cells micrometer (um) 10^-6 m or one-millionth
measures cellular organelles and nanometer (nm) 10^-9 m or one-billionth
viruses
magnification increase in size of the object
resolution ability to distinguish two points that are
close
together (resolving power)
the closer two objects are the higher the
resolution
will need to be
contrast difference of light absorbance between two
objects or the object and its background
greater contrast = more visibility
, magnification results when radiation (light) bends as it passes through
the light
how does staining help us view most microorganisms are colorless so the
microorganisms better? staining
increases the contrast
what is the most important the microscope
resource
for studying biology at the micro
level?
light microscope use visible light and blue wavelengths for
improved
resolution
magnification: 1x-2000x
resolution: 10mm-200nm
whole cells and organelles
electron microscope uses electrons with specimens in a
vacuum
magnification: 1000x-100,000x
resolution: 1mm-0.1nm
prokaryotic cells, viruses, macromolecules,
and
large atoms
probe microscope utilizes electronic probes that move over
specimen
service
magnification: greater than 100,000,000x
resolution: 0.01nm-10nm
3D surface of macromolecules and atoms
Questions and Answers with Verified
Solutions | Latest Updated 2026
microscopy the use of light or electrons to magnify
objects
to measure an object, the unit smaller scale than the object itself
must
be
used to measure the size of cells micrometer (um) 10^-6 m or one-millionth
measures cellular organelles and nanometer (nm) 10^-9 m or one-billionth
viruses
magnification increase in size of the object
resolution ability to distinguish two points that are
close
together (resolving power)
the closer two objects are the higher the
resolution
will need to be
contrast difference of light absorbance between two
objects or the object and its background
greater contrast = more visibility
, magnification results when radiation (light) bends as it passes through
the light
how does staining help us view most microorganisms are colorless so the
microorganisms better? staining
increases the contrast
what is the most important the microscope
resource
for studying biology at the micro
level?
light microscope use visible light and blue wavelengths for
improved
resolution
magnification: 1x-2000x
resolution: 10mm-200nm
whole cells and organelles
electron microscope uses electrons with specimens in a
vacuum
magnification: 1000x-100,000x
resolution: 1mm-0.1nm
prokaryotic cells, viruses, macromolecules,
and
large atoms
probe microscope utilizes electronic probes that move over
specimen
service
magnification: greater than 100,000,000x
resolution: 0.01nm-10nm
3D surface of macromolecules and atoms
