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Microbiology Lab - Midterm Study Guide Question and answers already passed 2025, Exams of Microbiology

Microbiology Lab - Midterm Study Guide Question and answers already passed 2025

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2024/2025

Available from 07/10/2025

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Microbiology Lab - Midterm Study Guide Question and answers
already passed 2025
1. List the 5 I's
1.
inoculation
2.
incubation
3.
isolation
4.
inspection
5.
identification
2. What does inoculation involve?
The
implantation
of
microorganisms
into
or upon a culture media. Often, it involves
spreading the sample on the surface of
a solid medium or intruding the sample
into a flask or tube filled with liquid media.
3. What does incubation create?
It
creates
the
proper
growth
temperature
and other conditions. Promotes multipli-
cation of the microbes over a period of
time.
4. What does incubation produce?
A
culture.
The
visible
growth
of
the
mi-
crobe in or on the medium.
5.
What is isolation?
It is a result of inoculation and incuba-
tion. Isolated microbes may take the form
of separate colonies (discrete mounds
of cells) on solid media, or turbidity
(free floating cells) in liquid broths.
6. What is done during inspection?
Colonies
or
broth
cultures
are
observed
pf3
pf4
pf5
pf8
pf9
pfa
pfd
pfe
pff
pf12
pf13
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pf15
pf16
pf17
pf18
pf19
pf1a
pf1b
pf1c
pf1d
pf1e
pf1f
pf20
pf21
pf22

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already passed 2025

  1. List the 5 I's 1. inoculation
  2. incubation
    1. isolation
    2. inspection
    3. identification
  3. What does inoculation involve? The implantation of microorganisms into or upon a culture media. Often, it involves spreading the sample on the surface of a solid medium or intruding the sample into a flask or tube filled with liquid media.
  4. What does incubation create? It creates the proper growth temperature and other conditions. Promotes multipli- cation of the microbes over a period of time.
  5. What does incubation produce? A culture. The visible growth of the mi- crobe in or on the medium.
  6. What is isolation? It is a result of inoculation and incuba- tion. Isolated microbes may take the form of separate colonies (discrete mounds of cells) on solid media, or turbidity (free floating cells) in liquid broths.
  7. What is done during inspection? Colonies or broth cultures are observed

already passed 2025 macroscopically for growth characteristics (color, texture, size, ect.) that could be useful in analyzing the specimen contents and ultimately completing identification.

already passed 2025 have been avoided? and retrieved his loop

  1. He could have turned ott the burner
  2. You may place your belongings anywhere in False the lab as long as they are out of the way and people cannot rip over them.
  3. Explain what you would do if you spill/break Notify the lab instructor and proceed with something: clean up.
  4. False

already passed 2025 Your mid-term and Final exam will be a prac- tical exam. (Meaning you will rotate around the lab moving station to station.)

  1. It is okay to apply cosmetics, eat, drink, smoke, and handle contact lenses in the laboratory.
  2. What is the penalty if you leave your work station a mess? False A 20 point deduction from the lab.
  3. What is the proper procedure for sterilizing 1. Turn on your Bunsen burner the inoculating loop?
  4. The air we breathe every day is free of bac- teria and fungi and would not contaminate an unprotected petri dish?
    1. Give the procedure for properly opening a petri dish:

already passed 2025

  1. Explain the correct and incorrect ways to obtain a sample
    1. Run inoculating loop starting @ zone 1, lessen to zone 2, then 3, then 4, where only one sample should be.
  2. What is the most important tool of a micro- The microscope biologist?
  3. What is the most used tool of a microbiolo- gist? The inoculating loop
  4. What does sterilization prevent? Contamination
  5. Give the procedure on how to focus a slide: place slide on 4x, use coarse knob to fo- cus, the move up to 40x, but only using the fine adjustment knob. You may view up to 100x but only using oil. Once you use oil, do not go back to the other mag- nifications.
  6. You must treat any bacterial culture with respect and assume it is potentially danger- ous to you. True
  7. What type of microscope do you use? A bright field microscope.
  8. What three structures are responsible for true movement?
    1. flagella
    2. cilia

already passed 2025

  1. pseudopods
  2. What is Brownian movement? Movement due to an aqueous environ- ment the cell is in.
  3. What is considered true motility? Give 2 ex- amples.

already passed 2025

  1. What is a positive chromophore called? A basic stain
  2. Why are basic stains attracted to bacteria? Because the cell walls are negatively charged due to polysaccharides that are present

already passed 2025

  1. What is it called when the dye stains the bacteria? Direct stain
  2. What is a negative chromophore called? An acidic stain
  3. What happens to acidic stains? The cell wall is negatively charged and it rejects the stain. Since it does not stain the bacteria it is called a negative stain.
  4. What 4 things does heat fixing do to the bacteria?
    1. Allows us to stain the bacteria
    2. Makes bacteria stick to the slide
    3. Prevent autolysis (cell death)
    4. Kills most cells in the slide, making it safer to handle
  5. Cocci morphology: Rounded
  6. Bacillus morphology: Elongated

already passed 2025

  1. Spirochete morphology: Twisted spiral (flagella are periplasmic)
  2. Vibrio morphology: kidney bean shape
  3. Coccobacillus morphology: round and elongated
  4. single cell arrangement 1 cell

already passed 2025

  1. Diplo cell arrangement 2 cells

already passed 2025 False False True False

already passed 2025 To perform a simple stain, what must be done to the slide first?

  1. A cover slip is used when you perform a simple stain. Put bacteria on the slide and one drop of H2O False
  2. Autolysis A process that takes place after "fixing" a smear to a slide. Fixing denatures the bacterial enzymes, preventing them from digesting cell parts, which causes the cell to break.
  3. Monotrichous 1 flagella
  4. Lophotrichous flagella bundled on one or both sides
  5. Amphitrichous 2 flagella, 1 on each side

already passed 2025

  1. What are the 2 types of simple stains (using 1. Direct stain only one dye)? 2. Negative stain (nigrosin)
  2. What is a negative stain? A simple stain that stains the background by leaves the bacteria unstained.
  3. In order, name the 4 dyes / chemicals used in the Gram staining procedure.
    1. Cover smear with primary dye (crystal violet / 30 sec)
    2. Cover with mordant (gram iodine / 10 sec)
    3. Add decolorizer (ethyl alcohol / 8-10 drops)
    4. Add safranin
  4. What are the benefits of gram staining? 1. Helpful in determining taxonomy
    1. Helpful in determining antibiotic ther- apy *Gram (-) are more resistant to antibiotics
    2. Helpful in determining cell structure

already passed 2025

  1. Name the 7 Gram + genera of bacteria: 1. Bacillus
    1. Listeria
    2. Staphylococcus
    3. Enterococcus
    4. Clostridium
    5. Streptococcus
    6. Micrococcus