Impact of microbes (Lec 1) (Set 1)
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Questions and Answers

Which of the following is NOT a type of microorganism discussed in the text?

  • Protists
  • Viruses
  • Bacteria
  • Plants (correct)

    • What is the estimated number of microbial cells on Earth?

  • 5 × 10^6 cells
  • 5 × 10^30 cells (correct)
  • 5 × 10^3 cells
  • 5 × 10^9 cells

    • What are the major causes of death in many lower income countries?

  • Nipah, malaria, tuberculosis
  • Malaria, tuberculosis, cholera (correct)
  • Cholera, COVID-19, influenza
  • COVID-19, influenza, monkeypox

    • What are the two main categories of microorganisms based on cell structure?

    <p>Prokaryotes and eukaryotes</p> Signup and view all the answers

    What is the main focus of microbiology?

    <p>The study of microorganisms</p> Signup and view all the answers

    How do most microorganisms carry out their life processes?

    <p>Independent of other cells</p> Signup and view all the answers

    Which of the following is true about bacteria?

    <p>Bacteria are among the first life forms to appear on Earth.</p> Signup and view all the answers

    Which of the following is a characteristic of archaea?

    <p>All of the above.</p> Signup and view all the answers

    What is the size range of viruses?

    <p>0.01-0.2 μm</p> Signup and view all the answers

    What is the function of the bacterial cell membrane?

    <p>All of the above.</p> Signup and view all the answers

    What is the relative size of eukaryotes compared to bacteria?

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

    What is the main element for movement in bacteria?

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

    Which of the following is a function of the bacterial cell wall?

    <p>All of the above</p> Signup and view all the answers

    Which of the following correctly describes the Gram-positive cell wall?

    <p>It has a thick peptidoglycan layer</p> Signup and view all the answers

    Why doesn't lysozyme lyse Archaea?

    <p>Archaea have a variety of cell walls including peptidoglycan</p> Signup and view all the answers

    What is the function of fimbriae in bacteria?

    <p>Recognition and attachment to surfaces</p> Signup and view all the answers

    Which of the following is a pattern of flagella arrangement in bacteria?

    <p>Peritrichous flagellum</p> Signup and view all the answers

    What is the proposed model for the proton turbine in bacteria?

    <p>Protons flowing through Mot proteins exert forces on charges present in ring</p> Signup and view all the answers

    What are plasmids in bacteria?

    <p>Small, closed circular DNA molecules that replicate independently of the chromosome</p> Signup and view all the answers

    What are endospores in bacteria?

    <p>Highly resistant structures that can survive for long periods of time</p> Signup and view all the answers

    True or false: Microorganisms are too small to be seen clearly by the unaided eye?

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

    True or false: Most microorganisms carry out their life processes independent of other cells?

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

    True or false: Infectious diseases are the major cause of death in many lower income countries?

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

    True or false: Microbes grow well in food fit for human consumption, leading to food spoilage and foodborne disease.

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

    True or false: Bacteria were among the first life forms to appear on Earth and are present in most of its habitats.

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

    True or false: Eukaryotes include bacteria, viruses, and certain algae, while prokaryotes include fungi, animals, and plants.

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

    True or false: Bacterial cell walls protect the cell from osmotic lysis?

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

    True or false: Gram-negative bacteria have a thicker cell wall compared to Gram-positive bacteria?

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

    True or false: Lysozyme breaks the glycosidic bonds in the peptidoglycan layer of bacterial cell walls?

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

    True or false: Endospores are highly resistant to heat, drying, radiation, and chemicals?

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

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