General Microbiology: Microbial Growth
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Questions and Answers

Which type of microorganism is most likely to be found in warm-blooded animals and in temperate and tropical environments?

  • Acidophiles
  • Alkalophiles
  • Mesophiles (correct)
  • Psychrophiles

What is the optimum pH range for acidophiles?

  • pH 11-14
  • pH 1-4 (correct)
  • pH 8-10
  • pH 5-7

Which type of microorganism is most likely to inhabit permanently cold environments?

  • Alkalophiles
  • Thermophiles
  • Hyperthermophiles
  • Psychrophiles (correct)

Where are hyperthermophiles most likely to be found?

<p>Undersea hydrothermal vents with temperatures in excess of 100°C (D)</p> Signup and view all the answers

Which organisms have evolved to grow best at low pH?

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

What is the temperature range for thermophiles?

<p>50-80°C (A)</p> Signup and view all the answers

Which enzyme breaks down H2O2 into H2O and O2?

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

What are the organisms that can tolerate some reduction in the water activity of their environment but generally grow best in the absence of added solute?

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

What is the ratio of the vapor pressure of the air in equilibrium with a solution to the vapor pressure of pure water?

<p>aw = P solute / P water (A)</p> Signup and view all the answers

Which group of organisms requires high levels of salts for growth?

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

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