22 Questions
What type of microorganisms are usually protozoans in a hay infusion unpigmented with moving microorganisms?
Sarcodina (Amoebae)
What type of microorganisms are greenish or golden-brown organisms usually?
Algae
What do organisms that appear blue-green usually represent?
Cyanobacteria
What is the movement type of microorganisms in Phylum Mastigophora?
Via flagella
What is the purpose of the buried-slide technique in the Contact Slide Assay?
Useful for observing soil fungi, actinomycetes, and bacteria via microscopy
What does urea provide in the context of spatial interactions of soil microorganisms?
Nitrogen source
What do bacteria tend to look like in the soil?
Small, rounded shapes due to nutritional stress
What are actinomycetes characterized by in the soil?
Thin strings
What is the purpose of HOAc in the Contact Slide Assay?
Fixes the microorganisms on the glass slide
What do fungi have in the context of spatial interactions of soil microorganisms?
Thick filamentous hyphae
What is the characteristic movement of microorganisms in Phylum Ciliophora?
Via cilia
What is the direct method of checking the air for viable microorganisms?
Settling plate
What is the range of microbial load for a normal plate count?
30 - 300 CFUs
What is the purpose of sugars in dried grass in the Hay Infusion for isolating and identifying microorganisms?
Provide food for bacteria and other microbes
What is the main characteristic of a crowded plate in standard plate count?
TNTC
What is the media plate used for the growth of microorganisms in the gravitational settling method?
Settling plate
What causes the appearance of a spreader in the film of water between the agar and the bottom of the plate?
Disintegration of bacterial clumps
What is the primary objective of isolating and identifying protozoa, cyanobacteria, and microalgae from freshwater sources?
To isolate and identify microorganisms
What drives smaller particles to settle slower in gravitational settling?
Air currents
What is the primary function of a spreader plate in microbial ecology?
To spread out bacterial colonies
What is the role of the bacteria in the Hay Infusion for isolating and identifying microorganisms?
Serve as food for the protozoa
What does TNTC stand for in the context of standard plate count?
Too numerous to count
Test your knowledge of microbial ecology with this quiz covering exercises in air, water, and soil. Learn about collecting bioaerosol samples and morphologically characterizing microbial colonies. Ideal for students of BIO 163.
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