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Microbiology Quiz Basic Lab Tests FYI, in this quiz there may be words used such as slant, but the photo doesn’t show the media as a slant. Therefore,

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Presentation on theme: "Microbiology Quiz Basic Lab Tests FYI, in this quiz there may be words used such as slant, but the photo doesn’t show the media as a slant. Therefore,"— Presentation transcript:

1 Microbiology Quiz Basic Lab Tests FYI, in this quiz there may be words used such as slant, but the photo doesn’t show the media as a slant. Therefore, just think about what you use in your lab, and relate that to what you are seeing here. Photos have been “borrowed” from the internet. If they are yours, please your URL so that I can give you credit. Also, most information was taken from Alfred E. Benson’s Microbiology Applications, Short Version, 9th Edition © NursingJourney.com

2 In a Gram stain, what are the positive and negative results? © NursingJourney.com

3 In a Gram stain, what are the positive and negative results? Positive: Purple Negative: Pink © NursingJourney.com

4 In a spore stain, what are the positive and negative results? © NursingJourney.com

5 In a spore stain,what are the positive and negative results? Positive: Green spores Negative: No spores (pink) © NursingJourney.com

6 In a acid-fast stain,what are the positive and negative results? © NursingJourney.com

7 In a acid-fast stain,what are the positive and negative results? Positive: Pink Negative: Blue © NursingJourney.com

8 What is this? What do the results reveal?

9 © NursingJourney.com To test if the organism is motile, stab a depth of 75% of the media and incubate hours at the best growth temperature already decided. Motility Test Media - MTM What is this? What do the results reveal? Negative for Motility Growth is confined to the stab area. Positive for Motility Growth is radiating from the stab area, cloudiness is present

10 © NursingJourney.com What is this? What do the results reveal?

11 © NursingJourney.com Negative result:- Solid in ice bath or refrigerator after 5 minutes. What is this? What do the results reveal? Gelatin Liquefaction - Nutrient Gelatin Positive result: Liquid in ice bath or refrigerator after 5 minutes. Stab straight to bottom with an inoculating needle. Put in ice bath or refrigerator for 5 minutes, read results. If negative, reincubate up to 30 days.

12 What is this? What do the results reveal? © NursingJourney.com

13 What is this? What do the results reveal? © NursingJourney.com Positive result Green slant in 0-10 minutes Phenylalanine Deaminase - Phenylalanine agar slant (PA) Streak slant with inoculator, After incubation time, use 5 drops of phenalalanine reagent. Negative result Yellow slant after 5-10 minutes

14 © NursingJourney.com What is this? What do the results reveal?

15 © NursingJourney.com Positive Result: Yellow (positive for acid) Bubbles (positive for gas) Negative Result: Red-pink (negative for acid) No bubbles (negative for gas) Use Durham tube to test for gas, incubate hrs. Reincubate negative results up to 30 days. What is this? What do the results reveal? Glucose, Lactose or Mannitol Fermentation - Phenol Red, Glucose, Lactose Mannitol Broth

16 What is this? What do the results reveal? © NursingJourney.com

17 What is this? What do the results reveal? © NursingJourney.com Negative Result Positive Result Methyl Red Test After incubating for 2-5 days, add 3-4 drops of Methyl Red reagent.

18 What is this? What do the results reveal? © NursingJourney.com

19 What is this? What do the results reveal? © NursingJourney.com Positive Result Negative Result Urea hydrolysis - Urea broth After heavy inoculation, incubate up to 30 days.

20 What is this? What do the results reveal? © NursingJourney.com

21 What is this? What do the results reveal? © NursingJourney.com Positive Result Clear zone Negative Result Dark zone Starch hydrolysis - Starch agar plate (SA) After incubating hrs, add grams iodine over growth.

22 What is this? What do the results reveal? © NursingJourney.com

23 What is this? What do the results reveal? © NursingJourney.com Negative Result Positive Result Uses citrate as sole carbon source Citrate utilization - Simmon’s citrate agar slant (S/C) Streak slant and stab butt, Incubate up to 30 days.

24 What is this? What do the results reveal? © NursingJourney.com

25 What is this? What do the results reveal? © NursingJourney.com Positive Result Red ring Negative Result Yellow ring 10 drops of Kovac’s reagent are added after a hour incubation. Tryptophan hydrolysis (indole) - Tryptone broth

26 What is this? What do the results reveal? © NursingJourney.com

27 What is this? What do the results reveal? © NursingJourney.com Casein hydrolysis - Skim milk agar plate (SMA) Positive Result Clear zone Negative Result no zone Incubate for hours

28 What is this? What do the results reveal? © NursingJourney.com

29 What is this? What do the results reveal? © NursingJourney.com A = Alkaline C = Acid D = Litmus Reduction E = Peptonization (Another result may be coagulation, but is hard too distinguish in a photo.) 1-5 days incubation time Litmus reactions - Litmus milk

30 What is this? What do the results reveal? © NursingJourney.com

31 What is this? What do the results reveal? © NursingJourney.com Hydrogen Sulfide Production - Kliger’s iron agar slant (KIA) Lactose Negative Red Slant Glucose Positive Yellow butt Hydrogen Sulfide Positive Black butt Streak slant for lactose, stab butt for glucose. Incubate hours. Save in refrigerator for new working stock. Lactose positive would be a yellow slant, and Glucose negative would be a red butt. If it is H2S+ negative, there will not be any black visible.

32 What is this? What do the results reveal? © NursingJourney.com

33 What is this? What do the results reveal? © NursingJourney.com Voges-Proskauer Negative Brown color Voges-Proskauer Positive Red color Add a dropperful of Barritt’s reagent A&B, after incubating for 5 days, and shake well for 2 hours. Voges-Proskauer Test, aka Acetoin - 1/2 MR-VP media

34 What is this? What do the results reveal? © NursingJourney.com

35 What is this? What do the results reveal? © NursingJourney.com Oxidase Positive Black colonies within 30 minutes Oxidase Negative No black colonies After incubation, tamp one oxidase disk on first quadrant Oxidase Production - Nutrient agar plate (NA)

36 What is this? What do the results reveal? © NursingJourney.com

37 What is this? What do the results reveal? © NursingJourney.com Catalase Production Positive Bubbles Catalase Production Negative No bubbles Catalase Production - Nutrient agar slant (NA) After a working stock has been incubated for 3-5 days, add 3 drops of hydrogen peroxide. Make sure to use an OLD working stock for this test!

38 What is this? What do the results reveal? © NursingJourney.com

39 What is this? What do the results reveal? © NursingJourney.com Negative for Nitrate Reduction Clear color Postive for Niatrate Reduction Red color Nitrate Reduction - Nitrate agar slant Incubate, and then add 3 drops of Nitrate reagents A & B. If a negative result occurs, confirm the result with zinc dust. Opposite color results will occur: Clear positive, red negative for nitrate reduction.

40 What is this? What do the results reveal? © NursingJourney.com

41 What is this? What do the results reveal? © NursingJourney.com Negative for Fat Hyrolysis No precipitate Postive for Fat Hydrolysis Blue precipitate Fat Hydrolysis - Spirit Blue agar plate (SBA) Incubate for hours.

42 Calculate the following dilution: © NursingJourney.com

43 Calculate the following dilution: © NursingJourney.com The correct answer is: C. (Remember to round the numbers.)

44 Calculate the following dilution: © NursingJourney.com

45 Calculate the following dilution: © NursingJourney.com The answer is 10 -6, or

46 Calculate the following dilution: © NursingJourney.com

47 Calculate the following dilution: © NursingJourney.com The answer is 10 -3, or.001

48 Microbiology Quiz Basic Lab Tests © NursingJourney.com Congratulations!! That’s all for this Microbiology quiz! Please remember, your instructor may require you to learn more, or less, of what is on this PowerPoint. It’s your responsibility to learn what you will be tested on!! (Including knowing if any errors were made.) Please report any errors to


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