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MICROBIOLOGY LAB PRACTICAL EXAM
1|GEORGIA SOUTHERN UNIVERSITY
BRAND NEW OFFICIAL QUESTIONS WITH
ANSWERS.
What can happen to a Gram stain if a smear is too heavy? -
correct answer -can't see cells
What happens to a Gram stain if a smear is too light.? - correct
answer -cells are scattered away or not enough
Flatworm - correct answer --has gastrovascular cavity, functions
as both mouth and anus
- locomotion involves gliding
Roundworms - correct answer --has a complete digestive tract,
separate openings for the mouth and anus
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How is biofilm formed - correct answer -- attaching and growing
on surface when exposed to water
Fermentation tubes - correct answer --detects acid and gases
from carbohydrates
-phenol red indicates alkaline
-yellow indicates acid production
-clear Durham tubes indicate gases
Methyl red test (M.R test) - correct answer -organisms make acid
from glucose
- red/orange is positive
-yellow is negative
Voges-Proskauer (VP test) - correct answer --organisms utilizing
butylene glycol to make acetoin
-red color on top is a positive
Citrate test - correct answer -- organism use it for carbon &
energy.
MICROBIOLOGY LAB PRACTICAL EXAM
1|GEORGIA SOUTHERN UNIVERSITY
BRAND NEW OFFICIAL QUESTIONS WITH
ANSWERS.
What can happen to a Gram stain if a smear is too heavy? -
correct answer -can't see cells
What happens to a Gram stain if a smear is too light.? - correct
answer -cells are scattered away or not enough
Flatworm - correct answer --has gastrovascular cavity, functions
as both mouth and anus
- locomotion involves gliding
Roundworms - correct answer --has a complete digestive tract,
separate openings for the mouth and anus
, Page | 2
How is biofilm formed - correct answer -- attaching and growing
on surface when exposed to water
Fermentation tubes - correct answer --detects acid and gases
from carbohydrates
-phenol red indicates alkaline
-yellow indicates acid production
-clear Durham tubes indicate gases
Methyl red test (M.R test) - correct answer -organisms make acid
from glucose
- red/orange is positive
-yellow is negative
Voges-Proskauer (VP test) - correct answer --organisms utilizing
butylene glycol to make acetoin
-red color on top is a positive
Citrate test - correct answer -- organism use it for carbon &
energy.
