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Microbiology lab final NDSU Questions and Correct Answers the Latest Update $12.69   Add to cart

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Microbiology lab final NDSU Questions and Correct Answers the Latest Update

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Primary stain crystal violet- purple dye What is the purpose of IMViC testing? To distinguish between fecal and non fecal coliforms? Selective media grow specific microorganisms and withhold others What are non-iodizing radiation visible light and ultraviolet light ultraviolet radiation...

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  • November 8, 2024
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Microbiology lab final NDSU Questions and
Correct Answers the Latest Update
Primary stain

✓ crystal violet- purple dye



What is the purpose of IMViC testing?

✓ To distinguish between fecal and non fecal coliforms?



Selective media

✓ grow specific microorganisms and withhold others



What are non-iodizing radiation

✓ visible light and ultraviolet light



ultraviolet radiation damages bacteria by introducing....

✓ thymine dimers



Growth media

✓ essential nutrients needed to grow microbes in lab



From exercise 11, where we inoculated glucose broth tubes (containing bromcresol purple as a

pH indicator) with bacteria. Describe the results for typical thermophile and mesophile



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✓ Mesophile will be purple at 55c and Thermophile will be yellow at 55c



Nutrient agar

✓ nutrient broth with added sugar to make it solid



Tempered agar

✓ melted and cooled agar



The planting of Serratia Marcescenes onto agar containing a low level of streptomycin (NAS)

resulted in organisms that developed a resistance to the antibiotic by...

✓ Random mutations



What does it mean when an organism cant grow in the presence of oxygen

✓ it is obligate anaerobe



_____ bacteria have high lipid content in their cell walls and retain the carbol fushin stain

even after washing with acidifed- alcohol

✓ Acid Fast



Acid fast stain is important because it diagnosis's ...

✓ Tuberculosis



The gram stain differentiates between bacteria based on the composition of their:


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✓ Cell wall



Acid fast bacteria stain what color

✓ Red



What does alpha hemolysis look like

✓ Green blob



What does beta hemolysis look like

✓ In the picture it appears yellows streaks



What does gamma hemolysis look like

✓ White/ clear streaks



Looking at a mannitol salt agar plate, which side would show the growth of S. aureus?

And how do you know??

✓ The yellow side because of the selective media. Fermentation = yellow



Why are multi drug resistant bacteria an important healthcare concern? What can we do to

combat the problem?

✓ B/C bacteria is becoming resistant fast. Helps if you listen to your doctor. Take as
prescribed. Dont over use. Do not stop medication early




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