Bacterial Cytoplasmic Granules and Structures Quiz
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Questions and Answers

What is the characteristic arrangement used to group Cocci?

  • Long filaments
  • Pairs
  • Clusters (correct)
  • Chains
  • What shape do bacteria with less than one complete twist or turn typically have?

  • Rod-shaped
  • Cube-shaped
  • Spherical
  • Spiral (correct)
  • What are the hair-like helical appendages responsible for swimming motility in bacteria called?

  • Glycocalyx
  • Flagella (correct)
  • Cilia
  • Pili
  • Which bacterial species is an example of Streptobacilli?

    <p>Bacillus subtilis</p> Signup and view all the answers

    What is the common external structure found in all bacterial cells?

    <p>Cell wall</p> Signup and view all the answers

    Which shape indicates that a bacterium has one or more complete turns?

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

    Who proposed the kingdom 'Protista' to include microorganisms that are typically neither plants nor animals?

    <p>E.H. Haeckel</p> Signup and view all the answers

    Which of the following is not included in the Protists kingdom according to the text?

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

    What distinguishes prokaryotic cells from eukaryotic cells?

    <p>Absence of nuclear membrane</p> Signup and view all the answers

    Which group of microorganisms are referred to as 'higher protists'?

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

    In which century were all living organisms grouped into two kingdoms, plant and animal, before the discovery of the microbial world?

    <p>18th century</p> Signup and view all the answers

    What was discovered with the aid of electron microscopy in the 1940s that led to the distinction between prokaryotes and eukaryotes?

    <p>Presence of a nuclear membrane</p> Signup and view all the answers

    During which phase of growth does cell growth occur without cell division?

    <p>Lag phase</p> Signup and view all the answers

    What factor does not influence the length of the lag phase?

    <p>Cell mass</p> Signup and view all the answers

    If a culture in exponential growth is transferred to fresh medium, which of the following is likely true?

    <p>No lag phase is observed</p> Signup and view all the answers

    What happens to the population of cells during the lag phase?

    <p>Gradual increase</p> Signup and view all the answers

    In which phase do all cells become capable of dividing at regular intervals by the end?

    <p>Lag phase</p> Signup and view all the answers

    Which type of culture inoculum is more likely to result in a lag phase when transferred to fresh medium?

    <p>Inoculum from stationary phase culture</p> Signup and view all the answers

    Which of the following serves as a reserve source of phosphate in bacteria?

    <p>Volutin granules</p> Signup and view all the answers

    In which habitat are gas vesicles typically found in bacteria?

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

    Which type of spore is extremely resistant to desiccation, staining, disinfecting chemicals, radiation, and heat?

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

    Which type of spore is formed external to the vegetative cell by budding at one end of the cell?

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

    Which type of spore is contained in an enclosing sac called a sporangium?

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

    In which bacterial genera are endospores typically produced (one per cell)?

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

    What controls the level of growth in a medium?

    <p>Nutrient concentration</p> Signup and view all the answers

    How does a turbidostat control growth rate?

    <p>By monitoring cell density or turbidity</p> Signup and view all the answers

    What prevents exponential growth from occurring indefinitely in a closed system?

    <p>Exhaustion of nutrients or accumulation of toxic products</p> Signup and view all the answers

    What would happen if a single bacterium with 20 minutes generation time grew exponentially for 48 hours?

    <p>Produce a population about 4000 times the weight of the earth</p> Signup and view all the answers

    What occurs during the stationary phase in bacterial growth?

    <p>Slow loss of cells through death balanced by new cell formation</p> Signup and view all the answers

    How is growth rate controlled in a photostat used for photosynthetic organisms?

    <p>By controlling the light supply</p> Signup and view all the answers

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