Microorganism Qiuz 1

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Microorganism Quizzes & Trivia

Microorganisms – or microbes – are microscopic organisms that can exist in their single-celled form, or in a colony of cells. They are organisms that cannot be seen with the naked eye, but with a microscope, hence the name.


Questions and Answers
  • 1. 
    Disease-causing microorganisms are called
    • A. 

      Decomposers

    • B. 

      Procaryotes

    • C. 

      Pathogens

    • D. 

      Eucaryotes

    • E. 

      Fermenters

  • 2. 
    The microorganisms that recycle nutrients by breaking down dead matter and wastes are called
    • A. 

      Decomposers

    • B. 

      Prokaryotes

    • C. 

      Pathogens

    • D. 

      Eukaryotes

    • E. 

      Fermenters

  • 3. 
    The microorganisms that do not have a nucleus in their cells are called
    • A. 

      Decomposers

    • B. 

      Prokaryotes

    • C. 

      Pathogens

    • D. 

      Eukaryotes

    • E. 

      Fermenters

  • 4. 
    All microorganisms are best defined as organisms that
    • A. 

      Cause human disease

    • B. 

      Lack a cell nucleus

    • C. 

      Are infectious particles

    • D. 

      Are too small to be seen with the unaided eye

    • E. 

      Can only be found growing in laboratories

  • 5. 
    Which of the following is a unique characteristic of viruses that distinguishes them from the other major group of microorganism?
    • A. 

      Cause human disease

    • B. 

      Lack a nucleus

    • C. 

      Cannot be seen without a microscope

    • D. 

      Contain genetic material

    • E. 

      Lack cell structure

  • 6. 
    Koch's postulates are criteria used to establish that
    • A. 

      Microbes are found on dust particles

    • B. 

      A specific microbe is the cause of a specific disease

    • C. 

      Life forms can only arise from preexisting life forms

    • D. 

      A specific microbe should be classified in a specific kingdom

    • E. 

      Microbes can be used to clean up toxic spills

  • 7. 
    Which of the following is a proper scientific name?
    • A. 

      Streptoccoci pyogenes

    • B. 

      Bacillus subtilis

    • C. 

      B. subtilis

    • D. 

      Bacillus subtilis

    • E. 

      Streptocci

  • 8. 
    The study of evolutionary relationships among organisms is called
    • A. 

      Biotechnology

    • B. 

      Genetics

    • C. 

      Recombinant DNA

    • D. 

      Phylogeny

    • E. 

      Taxonomy

  • 9. 
    The surgeon who advocated using disinfectants on hands and in the air prior to surgery was
    • A. 

      Joseph Lister

    • B. 

      Ignaz Semmelweis

    • C. 

      Robert Koch

    • D. 

      Louis Pasteur

    • E. 

      Antonis van leewenhoek

  • 10. 
    The term sterile means free of all life forms
    • A. 

      True

    • B. 

      False

  • 11. 
    Select the correct descending taxonomic hierarchy(left to right)
    • A. 

      Family, order, class

    • B. 

      Family, genus, species

    • C. 

      Genus, species, family

    • D. 

      Class, phylum, order

    • E. 

      Kingdom, domain, phylum

  • 12. 
    A friend has told you that he thinks that the world would be a safer place if all bacteria could be destroyed. Which of the following would be true if his suggestion were carries out?
    • A. 

      There would be no infectious diseases in humans

    • B. 

      Pets would be free of disease

    • C. 

      Certain foods such as beer, cheese, or yogurt could not be made easily

    • D. 

      There would be no ability to make medicines

  • 13. 
    Anything that occupies space and has mass is called
    • A. 

      An electron

    • B. 

      Living

    • C. 

      Matter

    • D. 

      Energy

    • E. 

      Space

  • 14. 
    The subatomic particles that surround the nucleus are the
    • A. 

      Electrons

    • B. 

      Protons

    • C. 

      Neutrons

    • D. 

      Protons and neutrons

    • E. 

      Protons and electrons

  • 15. 
    Cations are
    • A. 

      Charged subatomic particles

    • B. 

      Atoms that have gained electrons

    • C. 

      Radioactive isotopes

    • D. 

      Capable of forming ionic bonds with anions

    • E. 

      Atoms without protons

  • 16. 
    The prominent building blocks of an enzyme are
    • A. 

      Nucleotides

    • B. 

      Glycerol and fatty acids

    • C. 

      Monosaccharides

    • D. 

      Phosphate, glycerol, fatty acids

    • E. 

      Amino acids

  • 17. 
    The polynucleotides strands of DNA are linked along their length by___________ bonds between the bases
    • A. 

      Covalent

    • B. 

      Ionic

    • C. 

      Van der Waals

    • D. 

      Double

    • E. 

      Hydrogen

  • 18. 
    The type of chemical bond linking amino acids together is a(n)
    • A. 

      Glycosidic bond

    • B. 

      Peptide bond

    • C. 

      Ester bond

    • D. 

      Ionic bond

    • E. 

      Hydrogen bond

  • 19. 
    Which of the following is the stored form of carbohydrates in animals?
    • A. 

      Glycogen

    • B. 

      Maltose

    • C. 

      Starch

    • D. 

      Cellulose

    • E. 

      Galactose

  • 20. 
    The o< helix and B-pleated sheet are examples of
    • A. 

      Primary structure

    • B. 

      Secondary structure

    • C. 

      Tertiary structure

    • D. 

      Quaternary structure

    • E. 

      Gamma structures

  • 21. 
    The five I's of studying microorganisms include all of the following except
    • A. 

      Inoculation

    • B. 

      Incubation

    • C. 

      Infection

    • D. 

      Isolation

    • E. 

      Identification

  • 22. 
    The term that refers to the purposeful assition of micoorganisms into a laboratory nutrient medium is
    • A. 

      Isolation

    • B. 

      Inoculation

    • C. 

      Immunization

    • D. 

      Infection

    • E. 

      Contamination

  • 23. 
    Which of the following is essential for development of discrete, isolated colonies?
    • A. 

      Broth medium

    • B. 

      Differential medium

    • C. 

      Selective medium

    • D. 

      Solid medium

    • E. 

      Assay medium

  • 24. 
    A pure culture contains only
    • A. 

      One species of microorganism

    • B. 

      Bacteria

    • C. 

      A variety of microbes from one source

    • D. 

      A variety of species from the same genus

    • E. 

      None of the choices are correct

  • 25. 
    A microbiologist inoculates Staphylococcus aureus into a culture medium. Following incubation both Staphylococcus aureus and Staphylococcus epidermidis are determined to be growing in the culture. what is the most likely explanation?
    • A. 

      The microbiologist used too much inoculum

    • B. 

      The culture is contaminated

    • C. 

      The incubation temperature was incorrect

    • D. 

      The culture medium must be selective

    • E. 

      The culture medium must be differential

  • 26. 
    The microbiologist inoculates Staphylococcus epidermidis and Escherichia coli into a culture medium. Following incubation, only the E. coli grows in the culture. What is the most likely explanation?
    • A. 

      The microbiologist used too much inoculum

    • B. 

      The culture is contaminated

    • C. 

      The incubation temperature was incorrect

    • D. 

      The culture medium must be selective

    • E. 

      The culture medium must be differential

  • 27. 
    A nutrient medium that has all of its chemical components identified and their precise concentrations known and reproducible would be termed
    • A. 

      Complex

    • B. 

      Reducing

    • C. 

      Enriched

    • D. 

      Enumeration

    • E. 

      Synthetic

  • 28. 
    The type of mictoscope in which you would see brightly illuminated specimens against a black background is
    • A. 

      Bright field

    • B. 

      Dark field

    • C. 

      Phase contrast

    • D. 

      Fluorescence

    • E. 

      Electron

  • 29. 
    This microscope does not use light in forming the specimen image
    • A. 

      Bright field

    • B. 

      Dark field

    • C. 

      Phase contrast

    • D. 

      Fluorescence

    • E. 

      Electron

  • 30. 
    This microscope is the most widely used and shows cells against a bright background
    • A. 

      Bright field

    • B. 

      Dark field

    • C. 

      Phase contrast

    • D. 

      Fluorescence

    • E. 

      Electron

  • 31. 
    The Gram stain, acid fast stain and endospore stain have the following in common
    • A. 

      Used on a wet mount of the specimen

    • B. 

      Use heat to force the dye into cell structures

    • C. 

      Outcome based on cell wall differences

    • D. 

      Use a negative stain technique

    • E. 

      Are differential stains

  • 32. 
    Media that contains extracts from plants, animals, or yeasts are
    • A. 

      Synthetic

    • B. 

      Complex

    • C. 

      Reducing

    • D. 

      Enriched

    • E. 

      All of the choices are correct

  • 33. 
    Brain-heart infusion, trypticase soy agar (TSA) and nutrient agar are all examples of which type of media?
    • A. 

      Synthetic

    • B. 

      Reducing

    • C. 

      Enriched

    • D. 

      Nonsynthetic

    • E. 

      Selective

  • 34. 
    Bacteria that require special growth factors and complex organic subatances are called
    • A. 

      Fastidious

    • B. 

      Pathogenic

    • C. 

      Harmless

    • D. 

      Anaerobic

    • E. 

      Aerobic

  • 35. 
    Which type of media can be used to determine if a bacteria is motile?
    • A. 

      Sim

    • B. 

      MacConkey

    • C. 

      Enriched media

    • D. 

      Thayer-Martin media

    • E. 

      Chocolate agar

  • 36. 
    All of the following are correct about agar except
    • A. 

      It is flexible

    • B. 

      It melts at the bioling point of water (100C)

    • C. 

      It is a source of nutrition for bacteria

    • D. 

      It solidifies below 42C

    • E. 

      It is a solid at room temperature

  • 37. 
    Spirochetes have a twisting and flexing locomotion due to appendages called
    • A. 

      Flagella

    • B. 

      Cilia

    • C. 

      Fimbriae

    • D. 

      Periplasmic flagella (axil filaments)

    • E. 

      Sex pili

  • 38. 
    All bacterial cells have
    • A. 

      A chromosome

    • B. 

      Fimbriae

    • C. 

      Endospores

    • D. 

      Capsules

    • E. 

      Flagella

  • 39. 
    The term that refers to the presence of flagella all over the cell suface is
    • A. 

      Amphitrichous

    • B. 

      Atrichous

    • C. 

      Lophotrichous

    • D. 

      Monotrichous

    • E. 

      Peritrichous

  • 40. 
    The outcome of the Gram stain is based on differences in the cell's
    • A. 

      Ribosomes

    • B. 

      Inclusions

    • C. 

      Cell wall

    • D. 

      Cell membrane

    • E. 

      Flagella

  • 41. 
    A bacterial cell exhibiting chemataxis probably has
    • A. 

      Fimbriae

    • B. 

      Capsule

    • C. 

      Mesosomes

    • D. 

      Flagella

    • E. 

      Metachromatic granules

  • 42. 
    Which structure protects bacteria from being phagocytized?
    • A. 

      Slime layer

    • B. 

      Fimbriae

    • C. 

      Cell membrane

    • D. 

      Capsule

    • E. 

      All of the choices are correct

  • 43. 
    A procaryotic cell wall that has primarily peptidoglycan with small amounts of teichoic acid and lipoteichoic acid is
    • A. 

      Gram neg

    • B. 

      Gram positive

    • C. 

      Archaea

    • D. 

      Spheroplast

    • E. 

      Acid fast

  • 44. 
    A bacterial genus that has waxy mycolic acid in the cell walls is
    • A. 

      Myocbacterium

    • B. 

      Mycoplasma

    • C. 

      Streptococcus

    • D. 

      Corynebacterium

    • E. 

      Salmonella

  • 45. 
    Lipopolysaccharide is an important cell wall component of
    • A. 

      Gram negative bacteria

    • B. 

      Gram positive bacteria

    • C. 

      Acid fast bacteria

    • D. 

      Mycoplasmas

    • E. 

      Protoplasts

  • 46. 
    The bacterial chromosome
    • A. 

      Is located in the cell membrane

    • B. 

      Contains all the cell's plasmids

    • C. 

      Is part of the nucleoid

    • D. 

      Forms a single linear strand of DNA

    • E. 

      All of the choices are correct

  • 47. 
    Which is mismatched?
    • A. 

      Ribosomes-- protein synthesis

    • B. 

      Inclusions-- excess cell nutrients and materials

    • C. 

      Plasmids -- genes essential for growth and metabolism

    • D. 

      Nucleoid-- hereditary material

    • E. 

      Cytoplasm-- dense, gelatinous solution

  • 48. 
    The function of bacterial endospores is
    • A. 

      To convert gaseous nitrogen to a usable form for plants

    • B. 

      For reproduction and growth

    • C. 

      For protection of genetic material during harsh conditions

    • D. 

      The storage of excess cell materials

    • E. 

      To have sites for photosynthesis

  • 49. 
    Which term is not used to describe bacterial cell shapes?
    • A. 

      Coccus

    • B. 

      Tetrad

    • C. 

      Vibrio

    • D. 

      Rod

    • E. 

      Spirochete

  • 50. 
    Which statement is not a characteristic of biofilms?
    • A. 

      They can be involved with human disease

    • B. 

      They involve bacteria only

    • C. 

      They evolve and adapt to their surroundings

    • D. 

      They are very difficult to eliminate with antimicrobials

  • 51. 
    What is the correct sequence for a Gram stain?
    • A. 

      Gram's iodine, crystal violet, alcohol, safranin

    • B. 

      Crystal violet, safranin, alcohol, Gram's iodine

    • C. 

      Crystal violet, Gram's iodine, alcohol, safranin

    • D. 

      Safranin, crystal violet, Gram's iodine, alcohol

    • E. 

      Alcohol crystal violet safranin Gram's iodine

  • 52. 
    All if the following are correct about biofilms except
    • A. 

      They are cooperative associations among several microbial groups

    • B. 

      They play an important role in recycling elements in the earth

    • C. 

      They can colonize medical devices

    • D. 

      An example could be the scumthat builds up in toilet bowls

    • E. 

      They are harmless aggregations of mictobes

  • 53. 
    Bacteria with small bunches of flagella emerging from the same site are said to be
    • A. 

      Lophotrichous

    • B. 

      Peritrichous

    • C. 

      Monotrichous

    • D. 

      Amphitrichous

    • E. 

      Spirilla

  • 54. 
    Which cell structure is an inportant agent in moderm genetic engineering techniques?
    • A. 

      Ribosomes

    • B. 

      Capsules

    • C. 

      Plasmids

    • D. 

      Inclusions

    • E. 

      Mesosomes

  • 55. 
    A microorganism has been described to you as living in hot acidic habitats in the waste piles of coal mines that regularly sustain a pH of 1 to a temperature of nearly 60c. Which type of organism do you immediately assume it is?
    • A. 

      Gracillucates

    • B. 

      Firmicutes

    • C. 

      Actinobacteria

    • D. 

      Archaea

    • E. 

      Spirochaetes