Archaea: Unicellular Prokaryotes
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Questions and Answers

Which of the following is a characteristic of Haloarchaea?

  • Found in freshwater lakes
  • Survive at low sodium chloride concentrations
  • Can only survive at high sodium chloride concentrations (correct)
  • Primarily found in oxygen-rich environments

    • What is a key characteristic of Purple phototrophic bacteria?

  • Primarily found in oxygen-rich environments
  • Contain bacteriochlorophylls and carotenoid pigments (correct)
  • Perform oxygenic photosynthesis
  • An abundant element in the lithosphere

    • What distinguishes Archaea from bacteria in terms of cell wall composition?

  • Bacteria have cell walls made from peptidoglycan
  • Cell wall composition is not a distinguishing factor
  • Archaea have cell walls made from peptidoglycan (correct)
  • Both Archaea and bacteria lack cell walls

    • Where do Free-Living Aerobic Nitrogen-Fixing Bacteria primarily populate?

    <p>'Sulfur springs'</p> Signup and view all the answers

    What is a characteristic of Proteobacteria?

    <p>Divided into 5 classes: Alpha, Beta, Gamma, Delta, Epsilon</p> Signup and view all the answers

    What distinguishes Archaea from bacteria in terms of cell wall composition?

    <p>Bacteria cell walls are made of peptidoglycan</p> Signup and view all the answers

    Where can Haloarchaea survive?

    <p>At high sodium chloride concentrations</p> Signup and view all the answers

    What is a characteristic of Proteobacteria?

    <p>They constitute the majority of known bacteria of medical, industrial, and agricultural significance</p> Signup and view all the answers

    What distinguishes Purple phototrophic bacteria?

    <p>They produce intracytoplasmic membrane systems and contain bacteriochlorophylls and carotenoid pigments</p> Signup and view all the answers

    Where do Methanogens obtain energy from?

    <p>By converting chemicals like carbon dioxide and hydrogen into methane</p> Signup and view all the answers

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