Louis Pasteur and Bacterial Classification Quiz
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Questions and Answers

What is the immediate environment where a microbial population lives called?

  • Microbial community
  • Habitat (correct)
  • Sewage sludge
  • Human tongue

What is a population of cells derived from?

  • Environmental stress
  • Interaction with higher organisms
  • Successive cell divisions (correct)
  • Scraped from a human tongue

Why can higher organisms sometimes not survive in certain microbial habitats?

  • Too hot or too cold
  • Too acidic or too caustic
  • Too salty or osmotically stressing
  • All of the above (correct)

Where do microbial numbers reach maximal levels in the human gastrointestinal tract?

<p>Colon (B)</p> Signup and view all the answers

Which part of the digestive tract lacks significant numbers of cellulose-degrading microorganisms?

<p>Colon (B)</p> Signup and view all the answers

What is the pH level in the colon where microbial numbers reach their maximal levels?

<p>7 (C)</p> Signup and view all the answers

Which process involves the microbial fermentation of glucose to produce ethyl alcohol?

<p>Yeast fermentation (B)</p> Signup and view all the answers

What did Louis Pasteur devise to prevent contamination of culture media?

<p>Using cotton for closing flasks and tubes (B)</p> Signup and view all the answers

According to Louis Pasteur, where do microorganisms in putrefying materials come from?

<p>Cells that entered from the air (B)</p> Signup and view all the answers

What did Louis Pasteur predict would happen if food was treated to destroy all living organisms present and then protected from contamination?

<p>It would not putrefy (D)</p> Signup and view all the answers

What did Louis Pasteur construct in 1864 to help with his experiments on sterilization?

<p>Swan-necked flask (Pasteur flask) (A)</p> Signup and view all the answers

What did the bend in the neck of the flask prevent from entering the nutrient solution?

<p>Microorganisms (B)</p> Signup and view all the answers

How long did nutrient solutions in the flasks remain sterile for?

<p>Indefinitely (A)</p> Signup and view all the answers

What settled the spontaneous generation controversy forever?

<p>Allowing particulate matter from the flask's neck to enter the liquid (D)</p> Signup and view all the answers

Who provided direct experimental support on microorganisms causing diseases?

<p>Robert Koch (C)</p> Signup and view all the answers

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