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Microbiology Question and and answers already passed

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  • Microbiology

Microbiology Question and and answers already passed Who pointed out a century ago that microorganisms are all around us and that they play a vital role in the ecology of life? Louis Pastor What year was the word 'Microbe' introduced and by whom? 1878 by Charles Sedillot. What are the...

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  • August 11, 2024
  • 26
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

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  • microbiology
  • microbiology question and and answers already pas

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Microbiology
Who pointed out a century ago that microorganisms are all around us and that
they play a vital role in the ecology of life?
Louis Pastor




What year was the word 'Microbe' introduced and by whom?
1878 by Charles Sedillot.




What are the four important behaviors in your drawings?
1. Size Relationship
2. Spatial Relationship
3. Behavior
4. Sequence of events




Who invented the first 'Simple' Microscope with a lens 300x?
Antoni van Leeuwenhoek




Who invented the first microscope before 1600s and was able to find
microbes in 1680s?
Zacharias Janssen

,What parts make up the microscope?
Ocular Eyepiece, Body tube, Arm, Objective Lenses Stage, Condenser,
Coarse adjustment Knob, Fine Adjustment Knob, Base, Iris Diaphrag,
Mechanical Stage knobs, Light.




What are the magnifications on the microscope?
(Ocular Lens: 10x) + The Objective Lens is 4x (scanning) = 40X 10x (low
power) = 100X, 40x to 45x (high dry) = 400X, 97x to 100x (immersion oil lens)
= 1000X




What is the resolving power equation?
Wavelength of light used
Resolving power = --------------------------------
2 x numerical aperture




Is the numerical aperture dependent on the maximum angle of the light
entering the object lens and on the refractive index?
Yes, the amount of light bending of the refractive index and of the material
between the objective lens and the slide.




What is Immersion oil?
makes the light rays pass straight through the slide and you are able to see
the specimen clearly, used to keep light from bending.

, Define the Refractive Index (N= 1.52)?
the ratio of the velocity of light in air to the velocity of light in a solution. N=
1.52




What happens with Spherical Aberration and light waves?
As light rays pass through a lens, they are bent to coverage at the focal point,
where an image is formed. (multi. focal points)




AD
What happens with Chromatic Aberrations and light waves?
A prism-like effect of the lens as various wavelengths of white light pass
throught to a different focal point for each wavelength.




What are Achromatic Lenses and their relationship with Chromatic and
Spherical Aberrations and light waves?
A lens system corrected for red and blue light or by lenses corrected for red,
blue, and other wavelengths called apochromatic lens.




Does a compound light microscope require a light source?
Yes

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