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

What is a characteristic of Proteobacteria?

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

Where can Haloarchaea survive?

<p>At high sodium chloride concentrations (D)</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 (C)</p> Signup and view all the answers

What distinguishes Purple phototrophic bacteria?

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

Where do Methanogens obtain energy from?

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

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