Microorganism Notes Week 2
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Questions and Answers

Which type of organisms use existing organic molecules as a carbon source for biomass?

  • Chemoautotrophs
  • Photoheterotrophs
  • Chemoheterotrophs (correct)
  • Photoautotrophs
  • What is the energy source for chemoautotrophs?

  • Organic molecules
  • Light
  • Inorganic carbon
  • Chemicals (correct)
  • Which type of organisms can use oxygen but can also grow without it?

  • Strict anaerobes
  • Facultative anaerobes (correct)
  • Anaerobes
  • Aerobes
  • What is the main difference between lithotrophs and organotrophs?

    <p>The energy source they use</p> Signup and view all the answers

    What is the function of oxidative phosphorylation in classic aerobic organotrophy?

    <p>Transfer of electrons to acceptors</p> Signup and view all the answers

    In which conditions are fermentations often carried out?

    <p>Anoxic (anaerobic) conditions</p> Signup and view all the answers

    What is the end product of 'Ethanolic' fermentation of glucose?

    <p>2 ethanol + CO2</p> Signup and view all the answers

    What does the reduction potential (E) indicate for a redox couple?

    <p>How readily the oxidized form gains electrons</p> Signup and view all the answers

    Which process involves anaerobic respiration with nitrate (NO3-) as a terminal electron acceptor, reduced to N2?

    <p>Denitrification</p> Signup and view all the answers

    What is the primary source of energy for lithotrophy?

    <p>Reduced inorganic compounds</p> Signup and view all the answers

    Anaerobic respiration by 'sulphate-reducing bacteria' is the reason marine sediments are smelly.

    <p>True</p> Signup and view all the answers

    What is the main purpose of 'sporulation' in bacteria?

    <p>To form thick-walled spores for resistance to desiccation</p> Signup and view all the answers

    What is the distinctive feature of filamentous actinobacteria in terms of spore production?

    <p>They produce thick-walled spores called 'exospores' or arthrospores</p> Signup and view all the answers

    What is the primary characteristic of Mycobacterium cell envelope that contributes to its hydrophobic nature?

    <p>Waxy coating over peptidoglycan, including mycolic acids</p> Signup and view all the answers

    What is the role of streptomyces in decomposition in soil?

    <p>Breaking down difficult-to-degrade polysaccharides like chitin and lignin</p> Signup and view all the answers

    Which process involves unequal division inside the cell wall during endospore formation?

    <p>Mother cell engulfs 'forespore'</p> Signup and view all the answers

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