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Introduction to Domain Archaea and Microbial Classification
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Introduction to Domain Archaea and Microbial Classification

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Questions and Answers

Which molecule is the Three-Domain System of Classification based on?

  • tRNA
  • rRNA (correct)
  • peptidoglycan
  • mRNA
  • What is the correct sequence in the classification hierarchy?

  • Kingdom, Order, Division, Class, Family, Genus
  • Kingdom, Division, Order, Class, Family, Genus (correct)
  • Kingdom, Division, Class, Order, Family, Genus
  • Kingdom, Class, Division, Order, Family, Genus
  • Which structure is never found in procaryotic cells?

  • flagella
  • cilia (correct)
  • capsule
  • ribosomes
  • Which structure controls the transport of materials between the cell and its external environment?

    <p>cell membrane</p> Signup and view all the answers

    In eucaryotic cells, what are the sites of photosynthesis?

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

    What is the major difference in the composition of the cell walls between Gram-positive and Gram-negative bacteria?

    <p>Gram-positive bacteria have a thick layer of peptidoglycan combined with teichoic acid, while Gram-negative bacteria have a thinner layer of peptidoglycan covered with a complex layer of lipid macromolecules.</p> Signup and view all the answers

    Which bacteria possess cell walls that do not contain peptidoglycan?

    <p>Bacteria in the genus Mycoplasma</p> Signup and view all the answers

    What is the function of cytoplasmic granules in bacteria?

    <p>Storage of reserve materials</p> Signup and view all the answers

    What is the main difference between Gram-negative and Gram-positive bacterial cell walls?

    <p>Gram-negative cell walls have an outer membrane, while Gram-positive cell walls contain a thick peptidoglycan layer.</p> Signup and view all the answers

    Which component of bacterial cells is crucial for resisting mechanical breakage and osmotic lysis?

    <p>Peptidoglycan layer</p> Signup and view all the answers

    Where are ribosomes typically found in procaryotic cells?

    <p>In the cytoplasmic granules</p> Signup and view all the answers

    What is the composition of a 70S procaryotic ribosome?

    <p>30S and 50S subunits</p> Signup and view all the answers

    How are cytoplasmic granules in bacteria identified microscopically?

    <p>By staining with a suitable stain</p> Signup and view all the answers

    Which type of cell wall contains teichoic acids according to the text?

    <p>Gram-positive cell wall</p> Signup and view all the answers

    What is the main constituent of most bacterial cell walls according to the text?

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

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