Simulation 1 - 3 (for Lab Practical One) Flashcards

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1
Q

What is the correct order of steps for a

Broth to Agar Plate.

A

Remove a loop full of bacterial culture from the broth tube, pass the mouth of the tube through the Bunsen burner flame, and replace the cap

Lift the lid of the agar plate slightly and streak the loop across the surface of the agar plate. Replace lid.

Sterilize inoculating loop, remove cap of culture tube, and pass mouth of culture tube through the Bunsen burner flame

Sterilize inoculating loop prior to replacing in loop holder

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2
Q

What is the correct order for

Broth to Broth Transfer

A

Remove a loop full of broth culture, pass mouth of broth culture tube through Bunsen burner flame, and replace cap on tube

Sterilize and cool inoculating loop, remove cap of culture tube, pass mouth of tube through Bunsen Burner flame

Pass mouth of broth tube through Bunsen burner flame and replace cap. Sterilize inoculating loop and return to loop holder

Remove cap of sterile broth tube, pass mouth of tube through the Bunsen burner flame, and insert inoculating loop into sterile broth

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3
Q

What is the proper use of Bunsen Burner

A

Be sure the gas valve is closed

Turn the rube in a clockwise direction until the air flow is almost complete closed

light a match and hold it off to one side of the top of the tube

Slowly turn on the gas by swiveling the gas valve until it is in line with the pipe. The gas should ignite

Adjust the tube and the needle valve (under base of the Bunsen burner) until a suitable flame has been achieved

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4
Q

Definition of Sterile

A

The freedom from the presence of viable microorganisms

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5
Q

Definition of Aseptic Technique

A

Combination of protocol that collectively maintain sterility, or asespsis, to prevent contamination of a patient or surface with microbes and infectious agents

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6
Q

What type of pathogen is B. Anthracis

A

Gram-positive, rod shaped bacterium

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7
Q

What is the correct laboratory BSL for B.Anthracis

A

BSL level 3

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8
Q

Why do you think Bacillus Anthracis is classified as Hazard grouped 3

A

It may be spread the community, but treatment is usually available

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9
Q

Which facility must we if we have an Ebola Sample?

A

BSL-4

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10
Q

Why is it important that a negative air pressure is maintained inside the Biosafety level 3 (BSL-3) lab

A

It minimized the chance of a microorganism leaving the lab

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11
Q

When should gloves and oversleeves be worn in a BSL-3 or CL3 lab

A

Gloves should be worn at all times, but over sleeves only when working with the cabinet

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12
Q

Once you have completed you training, which of these factors is NOT important with regard to your buddy Marie?

A

Marie should remain in the lab with you at all times

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13
Q

Which of these factors apply to Class 3 mode

A

Class 3 mode provides a physical barrier between the user and the microbes

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14
Q

What does HEPA stand for in a HEPA filter?

A

High - Efficiency Particulate Air

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15
Q

Should we put on the side panel in Class One mode? The side panel should be put on ______

A

So there is a stronger airflow into the front aperture of the cabinet

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16
Q

In class One mode, should the night panel be removed or attached?

A

Removed. You are protected by air drawn into the cabinet

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17
Q

As you can see, the status of the BSC is CLEAN. When should the CLEAN sign be used

A

When the cabinet contains nothing hazardous

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18
Q

When testing whether the powder sample contains the anthrax agent (B.anthracis) or not. What should you do first?

A

Isolate the DNA of the bacteria from the sample

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19
Q

Why is it important that sterility test is carried out

A

To ensure the culture is completely sterile before being removed from the lab

20
Q

You have to be careful when working inside the biosafety cabinet. What should you do to clean the spill.

A

Perform fumigation

21
Q

What should all work surfaces be cleaned with at the end of each working day?

A

5% biocleanse

22
Q

The different personal protection equipments are put on and taken off in a specific area. Which of these statements is correct?

A

Overshoes are put on in the anteroom and taken off in the lab

23
Q

Why do all staff need to sign in and out of the lab?

A

Only authorized people are allowed in the lab, a sign out sheet keeps track of this

24
Q

When fumigating the lab, which of the following should not be carried out

A

Fridge and freezer doors should’ve be cleaned and opened

25
Q

Calculation of Total magnification

A

Ocular Lens magnification X Objective Lens Magnification

26
Q

Definition of Resolution

A

Reveals the outcome of the case and unpack the broader lessons to be learned

27
Q

Factors Affecting Resolution

A

Wavelength and numerical aperture

28
Q

What is the correct negative control to determine whether your reagents and tools are contaminated?

A. None; you only need to do a positive control when culturing microbes

B. Unculture Medium: if no colonies form on this plate, there is no contamination

C. Water: if colonies form on this plate, something was contaminated

D. Add Antibiotics to the sample: if no colonies form on this plate, everything was safe

A

B: Unculture Medium: if no colonies form on this plate, there is no contamination

29
Q

After disinfecting work space, what’s your next action?

A. Take off your safety goggles
B. Go and have lunch
C. Turn Bunsen burner back on
D. Wash your hands

A

D. Wash your hands

30
Q

What is 1-3

A

1: Eye piece (ocular lens)

2: Revolving nose piece (to hold multiple objective lenses)

3: Objective Lenses

31
Q

What is 9, 4, 5

A

9: Mechanical stage

4: Coarse focus (large knob)

5: fine focus (small knob)

32
Q

What is 6, 8, 7

A

6: stage (to hold the specimen)

8: Diaphragm

7: Illuminator

33
Q

What the two no numbers (top to bottom)

A

Top: X-Y mechanical stage knobs (to move slide)

Bottom: Rheostat (to adjust light intensity)

34
Q

Procedure of Fixing bacteria to a slide

A

Thin layer of specimen is spread on the slide (smear)

Slide is then briefly heated over the heat source

35
Q

Procedure of Gram Stain Method

A

Step 1: Crystal Violet (primary stain added to specimen water)

Step2: Iodine (Mordant makes dye less solvable so it adheres to cell walls

Step 3: Alcohol: decolorizer washes away stain from gram-negative cell walls

Step 4: Safranin: counter stain allows dye adherance to gram-negative cell

36
Q

Procedure of Acid Fast Satin Method

A

Primary, decolorizing, counterstaining

Acid-fast staining procedure would be categorized as a differential stain

37
Q

Procedure of Endospore Stain Method

A

1: Place slide on beaker with boiling water

2: saturate slide with Malachite green

3: staring for 5-6 mins, add more water as it evaporates

4: Forceps to remove slide and cool slide

5; rinse slide with water to remove excess malachite green

6: Cover smear with safranin for 60-90 sec

7: rinse to remove excess safaris

8: blot slide with bibulous paper

38
Q

What is the purpose of staining biological samples

A

Adding contrast and labeling specific structures

39
Q

What does it mean to have parfocal objectives?

A

The sample remains in focus when the objectives are changed

40
Q

Which of these factors is improved by adding immersion oil when using the 100x objective?

A

Resolution

41
Q

Can Scientist use the sampled they have already stained with the Mallory stain to study goblet cell numbers and morphology?

A

Yes, the outline of the cell, the nucleus and mucus each have a different color

42
Q

How to interpret Gram Stain results

A

Purple = Gram Positive

Pink/red = Gram Negative

43
Q

Interpretation of Acid Fast Stain

A

Pink = Acid Fast Bacteria

Blue/purple = Non Acid Fast Bacteria

44
Q

Interpret Endospore Stain

A

Endospore appear Bluish green

Non Endospore pink/red

45
Q
A

Gram Stain

46
Q
A

Acid Fast Stain

47
Q
A

Endospore Stain