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Fresh Grad Lands Job as Real Estate Agent With Help from Professional Writers

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Lab Exam 1

Navigation   » List of Schools  »  Prince George Community College  »  Biology  »  Bio 2010 – Microbiology  »  Spring 2023  »  Lab Exam 1

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Below are the questions for the exam with the choices of answers:

Question #1
All of the following bacteria genus and species were gelatinase positive EXCEPT?
A  Serratia marcescens
B  Pseudomonas fluorescens
C  Bacillus subtilis
D  Escherichia coli
Question #2
Which of the following is the BEST reason to flame your flame loop between each Streak-for-Isolation sector?
A  it is good practice for other lab related techniques
B  It carves a path in the agar that promotes isolation
C  it reduces the number of bacteria as we move them from sector I to sector IV
D  it increases the number of bacteria as we move them from sector I to sector IV
Question #3
Which of the following is a positive Starch Agar final product?
A  fructose
B  nucleotides
C  amino acids
D  glucose
Question #4
Which of the following sectors on a plate prepared for streaking for isolation should have isolated colony growth?
A  III
B  IV
C  I
D  II
Question #5
Which of the following exoenzymes does the Spirit Blue Agar test for?
A  Gelatinase
B  Lipase
C  Caseinase
D  Amylase
Question #6
From our microbial control lab experiments, which of the following bacteria genus and species should have displayed the highest thermal death point?
A  Neisseria sicca
B  Staphylococcus epidermids
C  Bacillus subtilis
D  Escherichia coli
Question #7
From our microbial control lab experiments, which of the following disinfectant/antiseptic is classified as a Quaternary Ammonium Compound (Quat)?
A  alcohol
B  lysol
C  zephiran chloride
D  bleach
Question #8
Which of the following is the Shaeffer-Fulton endospore bleach or destain?
A  safranin
B  carbolfuchsin
C  none of these
D  acid alcohol
E  crystal violet
Question #9
Suppose we conduct a hand washing experiment. From our 0.2 ml sample. From this sample we counted 220 cells. How many colony forming units (CFU’s) are there per Liter?
A  1.1 X E6
B  1.1 X E5
C  1.1 X E3
D  1.1 X E4
E  1.1 X E2
Question #10
Which of the following is the Ziehl-Neelsen acid fast secondary stain?
A  safranin
B  none of these
C  Loefflerâ s methylene blue
D  malachite green
E  crystal violet
Question #11
Which of the following is the Ziehl-Neelsen acid fast primary stain?
A  carbolfuchsin
B  none of these
C  crystal violet
D  safranin
E  acid alcohol
Question #12
Which of the following is the substrate found in Skim Milk Agar?
A  triglyceride
B  starch
C  gelatin
D  casein
Question #13
From our exoenzyme lab results, which of the following bacteria genus and species was lipase positive?
A  Staphylococcus aureus
B  Mycobacterium smegmatis
C  Pseudomonas fluorescens
D  Neisseria sicca
E  Escherichia coli
Question #14
From our microbial control lab, which of the following conditions would you expect the highest percentage of bacterial cell death? Cells exposed to UV radiation in:
A  Open Petri plates.
B  Petri plates with glass lids.
C  Petri plates with plastic lids.
D  Petri plates covered with aluminum foil.
E  Petri plates covered with paper.
Question #15
Which compound do Ziehl-Neelsen acid-fast positive stained cells have in their cell walls?
A  lactic acid
B  crystal violet
C  peptydoglycan
D  mycolic acid
Question #16
Which of the following is the best definition of contamination?
A  the presence of pathogens
B  the presence of bacteria
C  site of infection
D  an accidental spill
Question #17
Which of the following is the Gram’s secondary stain?
A  Acetone- Alcohol
B  Crystal violet
C  Safranin
D  Carbolfuchsin
E  Loeffler’s methylene blue
Question #18
Which of the following is the Gram’s destain or bleaching reagent?
A  Loeffler’s methylene blue
B  Safranin
C  Carbolfuchsin
D  Crystal violet
E  Acetone- Alcohol
Question #19
Which of the following is the correct temperature for incubating bacteria taken from a human small intestine?
A  37oC
B  20oC
C  10oC
D  25oC
Question #20
Which of the following terms regarding the presence of microorganisms means “everywhere”?
A  claryvoyant
B  sporadic
C  ubiquitous
D  tropical
Question #21
Suppose you obtained your tube with melted agar, brought it back to your desk, and subsequently forgot about the tube. When you remember, you look and discover the agar in the tube has solidified. Your lab partner says, just put it in a beaker of hot water, it will melt again. You try this with no success. The agar did not melt. Which of the following best explains why the agar did not melt?
A  cooling the agar it destroyed it
B  agar cannot be re-melted
C  more than one of the above is correct
D  the water temperature was not hot enough
E  the water temperature was not cool enough
F  none of these
Question #22
What is the name of the instrument that we MUST use during the aseptic microorganism transfer during our lab activities?
A  flame wand
B  pipettor
C  flame loop
D  finger
Question #23
How should you sterilize materials that will make contact with your culture media?
A  wash them in the sink
B  by using the Bunsen burner and flaming them
C  you don’t need to sterilize materials that will make contact with your experiment
D  more than one of these are correct
E  wiping it down with a tissue
F  none of these
Question #24
Which of the following choices is the BEST definition of depth-of-field?
A  the ability to distinguish two small objects as separate
B  the image that one sees when looking through the oculars
C  the distance between the end of the microscope objective lens and the specimen slide
D  the ability to focus above or below a stained specimen
Question #25
What is the purpose of using oil on the oil immersion lens?
A  to increase contrast of the specimen
B  to prevent light refraction away from the objective lens
C  to lubricate the sample slide and the objective
D  to clean the microscope stage elevator
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Manush
Fresh Graduate
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