1
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Microbiology lab Questions and Answers
(100% Correct Answers) Already Graded
A+
What is the purpose of installing the comb? [ Ans: ] To create a
well or pockets in the gel where samples can later be placed.
Why is ethidium bromide added to the hot liquid agarose? [ Ans:
] Ethidium bromide is needed to see the DNA bands in the gel
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under UV illumination.
Why is it important to pour slowly and avoid air bubbles? [ Ans: ]
Such bubbles would interfere with the movement of the sample
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through the gel, distorting the results.
What happens if you set a low voltage during electrophoresis? [
Ans: ] The migration of the DNA bands will be slow
What would happen if the gel was run for too long? [ Ans: ] The
sample bands would move to far and leave the bottom of the
gel.
What is the goal of microscopy? [ Ans: ] To create a magnified
image of objects that are too small to be seen with the unaided
eye.
Which metric unit is most appropriate for expressing the size of
human skin cells? [ Ans: ] Micrometer
Select the components used by a bright-field microscope to view
a specimen.
Multiple select question.
A projector
, 2
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A light source
Glass lenses
A stream of electrons [ Ans: ] A light source
Glass lenses
Which lens has a magnification of 40×?
Multiple choice question.
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High-power objective
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Scanning objective
Low-power objective
Oil immersion [ Ans: ] High-power objective
Which part of the bright-field microscope is a lens that is located
closest to the eye during use? [ Ans: ] The ocular lenses
Resolution is an image quality factor that involves being able to
see fine ___________, Incorrect Unavailable, which is essential for
image clarity. [ Ans: ] Details
The lenses of a bright-field microscope are responsible for the
_____ of the object you are viewing. [ Ans: ] Magnification
What is enhanced when a stain is used to make a sample, or parts
of a sample, darker than the background in a slide? [ Ans: ]
contrast
The total magnification of an image is determined by ______ the
magnification power of the ocular lens and the magnification
power of the objective lens used. [ Ans: ] Multiplying
For Expert help and assignment solutions, +254707240657
Microbiology lab Questions and Answers
(100% Correct Answers) Already Graded
A+
What is the purpose of installing the comb? [ Ans: ] To create a
well or pockets in the gel where samples can later be placed.
Why is ethidium bromide added to the hot liquid agarose? [ Ans:
] Ethidium bromide is needed to see the DNA bands in the gel
© 2025 Assignment Expert
under UV illumination.
Why is it important to pour slowly and avoid air bubbles? [ Ans: ]
Such bubbles would interfere with the movement of the sample
Guru01 - Stuvia
through the gel, distorting the results.
What happens if you set a low voltage during electrophoresis? [
Ans: ] The migration of the DNA bands will be slow
What would happen if the gel was run for too long? [ Ans: ] The
sample bands would move to far and leave the bottom of the
gel.
What is the goal of microscopy? [ Ans: ] To create a magnified
image of objects that are too small to be seen with the unaided
eye.
Which metric unit is most appropriate for expressing the size of
human skin cells? [ Ans: ] Micrometer
Select the components used by a bright-field microscope to view
a specimen.
Multiple select question.
A projector
, 2
For Expert help and assignment solutions, +254707240657
A light source
Glass lenses
A stream of electrons [ Ans: ] A light source
Glass lenses
Which lens has a magnification of 40×?
Multiple choice question.
© 2025 Assignment Expert
High-power objective
Guru01 - Stuvia
Scanning objective
Low-power objective
Oil immersion [ Ans: ] High-power objective
Which part of the bright-field microscope is a lens that is located
closest to the eye during use? [ Ans: ] The ocular lenses
Resolution is an image quality factor that involves being able to
see fine ___________, Incorrect Unavailable, which is essential for
image clarity. [ Ans: ] Details
The lenses of a bright-field microscope are responsible for the
_____ of the object you are viewing. [ Ans: ] Magnification
What is enhanced when a stain is used to make a sample, or parts
of a sample, darker than the background in a slide? [ Ans: ]
contrast
The total magnification of an image is determined by ______ the
magnification power of the ocular lens and the magnification
power of the objective lens used. [ Ans: ] Multiplying
