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Microbiology Final Exam

37 Questions
Microbiology Quizzes & Trivia

Microbiology final exam

Questions and Answers
  • 1. 
    Bacterial growth phase where cellular division seems to have stopped or ceases for a period of time:
    • A. 

      The Lag Phase

    • B. 

      The Log Phase

    • C. 

      The Stationary Phase

    • D. 

      The Death Phase

  • 2. 
    Used on fastidious organisms that require defined known quantities of specific nutrients:
    • A. 

      Nutrient broth

    • B. 

      Nutrient agar

    • C. 

      Defined media

    • D. 

      Complex media

  • 3. 
    Protection against osmotic lyses is provided by:
    • A. 

      The cellular plasma membrane

    • B. 

      The cell wall

    • C. 

      The cell's capsule

    • D. 

      Lysosomes

  • 4. 
    Thermophiles develop at temperatures between:
    • A. 

      -5 and 20C

    • B. 

      40 and 80C

    • C. 

      -5 and 35C

    • D. 

      65 and 105C

  • 5. 
    Name associate to the presence of a cell wall and a capsule together in a bacterial cell:
    • A. 

      The cytoplasmic membrane

    • B. 

      The Envelop

    • C. 

      The Capsule

    • D. 

      The Cell Wall

  • 6. 
    Which group do strict anaerobes partner with to find an environmental condition optimal for growth?
    • A. 

      Obligated aerobes

    • B. 

      Aerotolerant anaerobes

    • C. 

      Microaerophiles

    • D. 

      Facultative anaerobes

  • 7. 
    What statement is not descriptive of the Log Exponential Phase
    • A. 

      Population growth is uniform

    • B. 

      Growth rate is constant

    • C. 

      Cells exhibit balanced growth

    • D. 

      It varies in length

  • 8. 
    What is Microbiology?
    • A. 

      The study of organisms too small to be seen with the naked eye.

    • B. 

      Organism or agents too small to be visible with the naked eye.

    • C. 

      Microorganisms relatively simple in their construction.

    • D. 

      Microorganism that become nutrients to other organisms.

  • 9. 
    Organelle responsible for the transport/delivery of ER products across different parts of the cell.
    • A. 

      The Golgi complex

    • B. 

      The Smooth ER

    • C. 

      The Rough ER

    • D. 

      The Nucleus

  • 10. 
    Bacterial growth phase where a maximal rate of cellular division is obtained:
    • A. 

      The Lag phase

    • B. 

      The Log phase

    • C. 

      The Stationary phase

    • D. 

      The Death phase

  • 11. 
    Contributes to the negative charge of Gram - bacteria:
    • A. 

      Broun's lipoproteins

    • B. 

      Porins

    • C. 

      Teichoic acids

    • D. 

      LPS

  • 12. 
    A Pure Culture:
    • A. 

      Presents a mixture of microbial organisms

    • B. 

      Can only be obtained by isolating the progeny of single cell

    • C. 

      Was first created by the efforts of microbiologist Luis Pasteur

    • D. 

      Can be obtained by growing bacteria in differential media

  • 13. 
    What statement describes bacteria that stains "pink" after a Gram stain:
    • A. 

      Bacteria that have lost all crystal violet staining after gram's alcohol washing

    • B. 

      Bacteria that have retained crystal violet during staining

    • C. 

      Bacteria that maintain their peptidoglycan layer

    • D. 

      Bacteria that failed to counterstain with safranin

  • 14. 
    Organism that can only thrive at very specific concentrations of oxygen within a medium (2-10% oxygen):
    • A. 

      Obligate aerobes

    • B. 

      Facultative anaerobes

    • C. 

      Aerotolerant anaerobes

    • D. 

      Microaerophiles

  • 15. 
    Gram positive bacteria stain:
    • A. 

      Purple

    • B. 

      Orange

    • C. 

      Black

    • D. 

      Pink

  • 16. 
    Bacterial type that presents teichoic acids associated to it's peptidoglycan cell wall:
    • A. 

      Gram +

    • B. 

      Gram -

    • C. 

      Archaea

    • D. 

      Acids Fast

  • 17. 
    Which dye will be more likely to adhere to the surface of a gram positive bacteria?
    • A. 

      Anionic

    • B. 

      Cationic

    • C. 

      Neutral

    • D. 

      Differential

  • 18. 
    • A. 

      Slime Layer

    • B. 

      Endospores

    • C. 

      Glycocalyx

    • D. 

      S-layer

  • 19. 
    What component of the LPS structure acts as an exotoxin:
    • A. 

      The O antigen

    • B. 

      The Lipid A region

    • C. 

      The core polysaccharide

    • D. 

      The thecoid acid

  • 20. 
    Which of the following is true about the lag phase:
    • A. 

      Cells adapt to a new medium

    • B. 

      In some cases it may be very short

    • C. 

      Cells replenish spent materials

    • D. 

      All of the above

  • 21. 
    The largest most diverse group of photosynthetic bacteria:
    • A. 

      Yeast

    • B. 

      Lichens

    • C. 

      Cyanobacteria

    • D. 

      Archaea

  • 22. 
    • A. 

      Cytokinesis

    • B. 

      Growth of a septum that separates the mother cell into two separate chambers

    • C. 

      Growth of the cell dividing it's chromosome and enlarging it's cell volume

    • D. 

      None of the above

  • 23. 
    Process of movement of bacteria towards or away from a particular stimulus or toxic agent:
    • A. 

      Chemotaxis

    • B. 

      Pseudopodia

    • C. 

      Cilia

    • D. 

      None of the above

  • 24. 
    Lacks a peptidoglycan cell wall and lives in extreme environments such as the hot springs of the Yellowstone Park:
    • A. 

      Bacteria

    • B. 

      Yeast

    • C. 

      Prokaryotes

    • D. 

      Archaea

  • 25. 
    Organism too small to be seen with the naked eye:
    • A. 

      Microbiology

    • B. 

      Microorganisms

    • C. 

      Insects

    • D. 

      Monkey's

  • 26. 
    • A. 

      Facultative anaerobe

    • B. 

      Strict anaerobe

    • C. 

      Obligate aerobe

    • D. 

      None of the above

  • 27. 
    Term that describes when light neither passes through or bounces off an object or is transmitted through them:
    • A. 

      Transmission

    • B. 

      Absorption

    • C. 

      Diffraction

    • D. 

      Refraction

  • 28. 
    Temperature below that of optimal growth cause bacterial cultures to:
    • A. 

      Perish quickly at high temperatures

    • B. 

      Slow their growth rate as temperatures approach the minimum

    • C. 

      Thrive without any evident damage to the cell

    • D. 

      None of the above

  • 29. 
    Bacterial families whose optimal growth occurs between pH 5.5 and pH 7:
    • A. 

      Alkalophiles

    • B. 

      Neutrophiles

    • C. 

      Acidophiles

  • 30. 
    Observed during the death phase, it presents successive waves of genetically distinct variants:
    • A. 

      The Log phase

    • B. 

      The Lag phase

    • C. 

      Prolonged decline growth

    • D. 

      The stationary phase

  • 31. 
    Staining procedure designed for bacterial families with high lipid content and resistant to standard staining:
    • A. 

      Gram stain

    • B. 

      Negative staining

    • C. 

      Simple stain

    • D. 

      Acid fast staining

  • 32. 
    • A. 

      Cell death at a logarithmic rate

    • B. 

      A decrease in cellular size and nucleoid condensation

    • C. 

      Synthesis of starvation proteins

    • D. 

      Endospore formation

  • 33. 
    Organelle responsible for the synthesis of protein in a eukaryotic cell:
    • A. 

      The Golgi complex

    • B. 

      The Smooth ER

    • C. 

      The rough ER

    • D. 

      The nucleus

  • 34. 
    • A. 

      Alkalophiles

    • B. 

      Neutrophiles

    • C. 

      Acidophiles

  • 35. 
    • A. 

      Nutrient limitation

    • B. 

      Limited oxygen availability

    • C. 

      Unlimited sources of nutrients

    • D. 

      Reaching a critical population density

  • 36. 
    Recognize which of the following statements is FALSE:
    • A. 

      Microscopes use long wavelengths to resolve images better

    • B. 

      The smaller the wavelength used the better the resolution

    • C. 

      Resolution is the ability to see two objects as separate discrete units

    • D. 

      If resolution is poor magnification is useless

  • 37. 
    Internal structure of a prokaryotic cell that form small bodies with accumulation of cellular material:
    • A. 

      Endospores

    • B. 

      The Nuclear region

    • C. 

      The Lysosomes

    • D. 

      Inclusion bodies