15 Questions
What is the immediate environment where a microbial population lives called?
Habitat
What is a population of cells derived from?
Successive cell divisions
Why can higher organisms sometimes not survive in certain microbial habitats?
All of the above
Where do microbial numbers reach maximal levels in the human gastrointestinal tract?
Colon
Which part of the digestive tract lacks significant numbers of cellulose-degrading microorganisms?
Colon
What is the pH level in the colon where microbial numbers reach their maximal levels?
7
Which process involves the microbial fermentation of glucose to produce ethyl alcohol?
Yeast fermentation
What did Louis Pasteur devise to prevent contamination of culture media?
Using cotton for closing flasks and tubes
According to Louis Pasteur, where do microorganisms in putrefying materials come from?
Cells that entered from the air
What did Louis Pasteur predict would happen if food was treated to destroy all living organisms present and then protected from contamination?
It would not putrefy
What did Louis Pasteur construct in 1864 to help with his experiments on sterilization?
Swan-necked flask (Pasteur flask)
What did the bend in the neck of the flask prevent from entering the nutrient solution?
Microorganisms
How long did nutrient solutions in the flasks remain sterile for?
Indefinitely
What settled the spontaneous generation controversy forever?
Allowing particulate matter from the flask's neck to enter the liquid
Who provided direct experimental support on microorganisms causing diseases?
Robert Koch
Test your knowledge on Louis Pasteur's contributions to bacterial classification, prevention of contamination in culture media, and studies on spontaneous generation and infectious diseases. Learn about his research on alcoholic fermentation and its mechanism.
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