Microbiology Final Exam Quiz - 2

50 Questions | Total Attempts: 69

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Microbiology Quizzes & Trivia

Take this interesting and typical quiz on microbiology and associated microscopic nonliving biological particles that interact with living things


Questions and Answers
  • 1. 
    Which is (are) true concerning the cell wall of bacteria?
    • A. 

      It determines the shape of the bacteria

    • B. 

      It prevents the bacteria from lysis

    • C. 

      It contains peptidoglycan

    • D. 

      It may be targeted by antibiotics such as penicillin

    • E. 

      All of the above

  • 2. 
    Microorganisms have been very helpful in research especially because
    • A. 

      They have relatively simple structures

    • B. 

      Most of them have short generation time allowing data collection in a short period of time

    • C. 

      A large population can be kept in a small space

    • D. 

      It is easy to visualize any transfer of genetic material

    • E. 

      A, B and C are correct

  • 3. 
    Koch's postulates for linking a specific disease with its causative agent DOES NOT include which of the folowing?
    • A. 

      The specific causative agent must be found in every case of the disease

    • B. 

      The disease organism must be isolated in pure culture

    • C. 

      Inoculation of a sample of the culture into a healthy, susceptible animal must produce the same disease

    • D. 

      Human subjects must be inoculated with the organism to assay its virulence

    • E. 

      None of the above

  • 4. 
    What characteristic do bright-field microscope, dark-field microscopes and the differential interference contrast microscope have in common?
    • A. 

      Visualize small molecules inside the cells

    • B. 

      Observe living specimens

    • C. 

      Deal with refractive index minimizing blurry images

    • D. 

      Work with specimens with differentially staining it

  • 5. 
    Which combination of objective lenses and ocular (eyepieces) lenses prvides the observer the highest magnification?
    • A. 

      40x objective combined with 20x ocular

    • B. 

      100x objective combined with 10x ocular

    • C. 

      100x objective combined with 20x ocular

    • D. 

      20x ovjective combined with 20x ocular

  • 6. 
    _____ refers to the ability to distinguish adjacent objects, and ____ refers to the capactiy of visualizing the object
    • A. 

      Wavelength; frequency

    • B. 

      Resolution; detection

    • C. 

      Resolution; magnification

    • D. 

      Frequency; resolution

    • E. 

      Refraction; detection

  • 7. 
    The function of the immersion oil when using the 100x objective is to 
    • A. 

      Increase the refractive index, and increase the resolution

    • B. 

      Avoid contact between the objective and the slide

    • C. 

      Increase the refractive index and decrease the resolution

    • D. 

      Decrease the refractive index allowing more light to reach the slide

  • 8. 
    Stains can be used to visualize
    • A. 

      Capsules

    • B. 

      Endospores

    • C. 

      Cell wall

    • D. 

      Flagella

    • E. 

      All of the above

  • 9. 
    Which of the following is NOT paired correctly?
    • A. 

      Fluid mosaic model; currently accepted model of cell membranes

    • B. 

      Cell envelope; association of plasma membrane and cell wall

    • C. 

      Nucleoid; irregular shaped region where genetic material is found

    • D. 

      Spirillum; a rigid spiral-shaped bacterial or archaeal cell

  • 10. 
    What is the relevance of surface area-to-volume ratio?
    • A. 

      None, there is no correlation between surface area and cell volume

    • B. 

      When surface area-to-volume ratio decreases, nutrient uptake becomes more efficient

    • C. 

      When surface area-to-volume ratio increases, nutrient uptake becomes more efficient

    • D. 

      When the surface area-to-volume ratio increases, cells can easily get desiccated

  • 11. 
    Some bacteria have flagella all over their cell. this kind of arrangement is called
    • A. 

      Monotrichous

    • B. 

      Peritrichous

    • C. 

      Lophotrichous

    • D. 

      Halotrichous

    • E. 

      Amphitrichous

  • 12. 
    Bacterial plasma membrane is embedded with several proteins that perform functions such as ___ and ___. the rigidity of the membrane is maintained by the presence of ___.
    • A. 

      Structural support; secretin of virulence factor; hopanoids

    • B. 

      Ion transport osmotic maintenance; sterols

    • C. 

      Structural support; secretion of virulence factor; sterols

    • D. 

      Fluidity; virulence; phospholipids

    • E. 

      Ion transport; osmotic maintenance; phospholipids

  • 13. 
    Archaeal cell wall is formed by a polymer made of NAT and NAG referred to as
    • A. 

      Murein

    • B. 

      Pseudopeptidoglycan

    • C. 

      Acid-fast

    • D. 

      Lipopolysacharide

    • E. 

      None of the above are correct

  • 14. 
    One of the answers below can NOT be counted as Pasteur's contribution to microbiology as a science
    • A. 

      The development of the pasteurization process

    • B. 

      Development of vaccine against smallpox

    • C. 

      The description of a protozoan as the infection agent in silkworms causing pebrine disease

    • D. 

      The description of the fermentation process and its results when carried out by yeast or bacteria

  • 15. 
    Which of the following is NOT a characteristic of electron microscopy?
    • A. 

      Electron microscope images allow us to describe and visualize living specimens

    • B. 

      The transmission electron microscope used magnetic lenses to form an image from electrons that have passed through a very thin section of a specimen

    • C. 

      The scanning electron microscope is used to examine the surfaces of microorganismsmin great detail

    • D. 

      Electron microscopes are able to detect and resolve particles as small as proteins

  • 16. 
    Prokaryotic cells are characterized by the 
    • A. 

      Absence of ribosomes

    • B. 

      Absence of DNA

    • C. 

      Absence of a membrane-limited nucleus

    • D. 

      Absence of membranous organelles

    • E. 

      C & D are correct

  • 17. 
    Analyzes of ribosomal RNA done in the 1970's by Carl Woes, showed major differences betwen __ and ___; both prokaryotic organisms belonging to the same kingdom
    • A. 

      Bacteria and protists

    • B. 

      Protists and archaea

    • C. 

      Protist and viruses

    • D. 

      Bacteria and archaea

    • E. 

      Viruses and viroids

  • 18. 
    The __ and ___ vwere critical in the development of microbiology
    • A. 

      Development of Bunsen burners; plates

    • B. 

      Development of microscopes; development of techniques for isolating microbes

    • C. 

      Establishment of Koch's postulates; plates

    • D. 

      Invention of plates; loops

  • 19. 
    What kind of information is provided by isolating microorganisms from their natural environment and culturing them in the laboratory
    • A. 

      Generation time

    • B. 

      Nutrient requirement

    • C. 

      Temperature requirement

    • D. 

      Cellular shape

    • E. 

      A, B & C are correct

  • 20. 
    Light of ___ wavelength typically will result in ___ resolution
    • A. 

      Longer; better

    • B. 

      Longer; poor

    • C. 

      Medium; better

    • D. 

      Shorter;better

    • E. 

      Shorter;worse

  • 21. 
    Why was the belief of spontaneous generation an obstacle to the development of microbiology as a science
    • A. 

      It would be impossible to have a sterile medium

    • B. 

      It would be difficult to link microorganism to certain diseases

    • C. 

      It would be hard to isolate cultures

    • D. 

      All of the above

  • 22. 
    In some Archaea, the double layer of phospholipid membane is replaced by a ___, making the membrane____ and resistant to harch environments
    • A. 

      Monolayer, more rigid

    • B. 

      Triple layer, more rigid

    • C. 

      Outer membrane, more rigid

    • D. 

      Monolayer, less rigid

    • E. 

      Triple layer, less rigid

  • 23. 
    Which of the following statements about endospores is NOT correct
    • A. 

      They are resistant to heat, chemicals, radiation a desiccation

    • B. 

      Endospore formation is triggered by lack of nutrients

    • C. 

      Most bacteria and archaea are able to form endospores

    • D. 

      Resistance to physical factors is due to high amount of dipocolinic acid and calcium

  • 24. 
    An evidence of early microbial life on Earth can be revealed in
    • A. 

      Ribosomal RNA

    • B. 

      Stromatolites

    • C. 

      Microbial evolution

    • D. 

      Cellular metabolism

    • E. 

      Probionts

  • 25. 
    Bacteriological media that are composed of ingredients whose exact chemical composition are known are called
    • A. 

      Designated

    • B. 

      Exact

    • C. 

      Defined

    • D. 

      Selective

    • E. 

      Aesthetic

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