Microbiology Trivia Quiz For Students!

50 Questions

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Microbiology Quizzes & Trivia

How do you feel when you hear that you many have an assessment quiz coming up in no time? The quiz below is perfect for ensuring that you do not freeze or be in doubt when the teachers come to you with a surprise quiz. Why don’t you try it out and see how many marks you would get if this was a surprise quiz?


Questions and Answers
  • 1. 
    Deep sea microbes that require increased hydrostatic pressure are:
    • A. 

      Acidophiles

    • B. 

      Alkalinophiles

    • C. 

      Barophiles

    • D. 

      Haolophiles

  • 2. 
    An enzyme which cleaves DNA to produce sticky end fragments is called a:
    • A. 

      Ligase

    • B. 

      Endonuclease

    • C. 

      Isomerase

    • D. 

      Oxidoreductase

  • 3. 
    The non-specific direct transfer of "naked" DNA from a donor bacterial cell to a recipient bacterial cell is:
    • A. 

      Transduction

    • B. 

      Conjugation

    • C. 

      Transformation

    • D. 

      Transfusion

  • 4. 
    Which of the following is a useful household disinfectant?
    • A. 

      30% ethyl alcohol

    • B. 

      5% silver nitrate

    • C. 

      5% sodium hypochlorite

    • D. 

      5% phenol

  • 5. 
    The term genotype refers to an organism's:
    • A. 

      Measurable features

    • B. 

      Genetic makeup

    • C. 

      Mutation rate

    • D. 

      Recombination capabilities

  • 6. 
    A bacterial virus transfers small pieces of DNA from donor to recipient bacteria by:
    • A. 

      Conjugation

    • B. 

      Transformation

    • C. 

      Transduction

    • D. 

      Transposons

  • 7. 
    Genes that code for repressor proteins in bacteria operons are called:
    • A. 

      Regulator genes

    • B. 

      Repressor genes

    • C. 

      Operator genes

    • D. 

      Structural genes

  • 8. 
    Microbes that must obtain their carbon in organic forms are:
    • A. 

      Autotrophs

    • B. 

      Heterotrophs

  • 9. 
    The codons in messenger RNA that specify amino acids in proteins are made up of:
    • A. 

      Monosaccharides

    • B. 

      Fatty acids

    • C. 

      Amino acids

    • D. 

      Nucleotide bases

  • 10. 
    The process of genetic transfer between bacteria which requires cell to cell contact is:
    • A. 

      Transfection

    • B. 

      Transformation

    • C. 

      Conjugation

    • D. 

      Transposons

  • 11. 
    Microorganisms that derive nutrients from the cells or tissues of the host are:
    • A. 

      Parasites

    • B. 

      Suprobes

  • 12. 
    A gene on a strand of DNA has the following sequence T-C-A-A-A-G-T-T-T-G-G-A-A-G-G-C-T-T-A-G-T. The sequence of nucleotides that would be transcribed into mRNA is:
    • A. 

      U-C-A-A-A-G-U-U-U-G-G-A-A-G-G-C-U-U-A-G-U

    • B. 

      A-G-U-U-U-C-A-A-A-C-C-U-U-C-C-G-A-A-U-C-A

    • C. 

      T-C-A-A-A-G-T-T-T-G-G-A-A-G-G-C-T-T-A-G-T

    • D. 

      None of the above

  • 13. 
    Biosynthesis of DNA in bacterial cells occurs by _________ replication.
    • A. 

      Conservative

    • B. 

      Semi-conservative

  • 14. 
    Antibiotic resistance of bacteria is associated most commonly with:
    • A. 

      Bateriophages

    • B. 

      Plasmids

    • C. 

      Spheroplasts

    • D. 

      Protoplasts

  • 15. 
    Which of the following substances can be used to disinfect water?
    • A. 

      Carbolic acid

    • B. 

      Aldehydes

    • C. 

      Iodine

    • D. 

      Hydrogen peroxide

  • 16. 
    Nutrients required in relatively large quantities that play a role in cell structure and function are:
    • A. 

      Micronutrients

    • B. 

      Macronutrients

  • 17. 
    The best method for sterilizing serum and other blood products is:
    • A. 

      Steam autoclave

    • B. 

      Hot air oven

    • C. 

      Filtration

    • D. 

      Boiling

  • 18. 
    Alcohol is effective against:
    • A. 

      Bacterial spores

    • B. 

      Enveloped viruses

    • C. 

      Vegetative bacterial cells

    • D. 

      All of these

  • 19. 
    The process whereby amino acids are assembled into proteins on the ribosomes is called:
    • A. 

      Hybridization

    • B. 

      Transcription

    • C. 

      Translation

    • D. 

      Recombination

  • 20. 
    A permanent, heritable alteration in the genetic information of a cell is called:
    • A. 

      Denaturation

    • B. 

      Mutation

    • C. 

      Transfection

    • D. 

      Phosphorylation

  • 21. 
    The time required for sterilization of objects in a steam autoclave is _______ at 15 p.s.i. for _____ minutes
    • A. 

      100 deg C / 10 min

    • B. 

      121 deg C / 20 min

    • C. 

      121 deg C / 30 min

    • D. 

      100 deg C / 12 min

  • 22. 
    An organism that uses inorganic CO2  as its carbon source is an:
    • A. 

      Heterotroph

    • B. 

      Autotroph

  • 23. 
    Bacteria that require growth factors and complex nutrients in the medium are:
    • A. 

      Holophiles

    • B. 

      Acidophiles

    • C. 

      Fastidious

    • D. 

      Barophiles

  • 24. 
    The germicidal properties of heavy metals are due to inactivation of:
    • A. 

      Nucleic acids

    • B. 

      Cell wall

    • C. 

      Sugars

    • D. 

      Proteins

  • 25. 
    Autotrophs which derive their energy from sunlight are:
    • A. 

      Chemoautotrophs

    • B. 

      Photoautotrophs

  • 26. 
    Glutaraldehyde is effective against:
    • A. 

      Bacteria

    • B. 

      Viruses

    • C. 

      Fungi

    • D. 

      All of these

  • 27. 
    Microorganisms that can grow only in the absence of oxygen are called:
    • A. 

      Obligate aerobes

    • B. 

      Obligate anaerobes

    • C. 

      Faculative

    • D. 

      None of these

  • 28. 
    The most abundant component of a microbial cell is __________.
    • A. 

      Sugar

    • B. 

      Lipids

    • C. 

      Water

    • D. 

      Proteins

  • 29. 
    The process of decontamination of living tissue to reduce the microbial population is called:
    • A. 

      Sanitization

    • B. 

      Degermination

  • 30. 
    In a _______ mutation the normal codon is changed into a stop codon.
    • A. 

      Neutral

    • B. 

      Nonsense

    • C. 

      Missense

    • D. 

      Dissense

  • 31. 
    Human pathogenic bacteria are most likely to be _______ in their temperature requirements.
    • A. 

      Thermophiles

    • B. 

      Mesophiles

    • C. 

      Psychrophiles

    • D. 

      Acidophiles

  • 32. 
    Bacteria which may or may not use oxygen are:
    • A. 

      Aerobic

    • B. 

      Capnic

    • C. 

      Facultative

    • D. 

      Anaerobic

  • 33. 
    A modified recombinant plasmid is placed into recipient bacteria by the process of:
    • A. 

      Conjugation

    • B. 

      Hybridization

    • C. 

      Mutation

    • D. 

      Transformation

  • 34. 
    The _____ is the time required to kill all microbes at a specified temperature.
    • A. 

      Thermal death time

    • B. 

      Thermal death point

    • C. 

      Thermal heat time

    • D. 

      None of the above

  • 35. 
    Agent which most specifically destroy bacteria are:
    • A. 

      Oxidizers

    • B. 

      Bactericidal

    • C. 

      Germicides

    • D. 

      Bacteriostatic

  • 36. 
    Thioglycollate acid (a reducing media) in a liquid medium supports the growth of ____ bacteria.
    • A. 

      Obligate aerobic

    • B. 

      Obligate anaerobic

  • 37. 
    The process of _____ prevents any genes in an operon that code for amino acids from being transcribed into messenger RNA.
    • A. 

      Induction

    • B. 

      Allosteric inhibition

    • C. 

      Repression

    • D. 

      Hybridization

  • 38. 
    The growth of microbes in blood and other tissues is known as __________.
    • A. 

      Asepsis

    • B. 

      Sepsis

  • 39. 
    The enzyme which is used to produce complentary DNA (cDNA) from messenger RNA is a:
    • A. 

      Gyrase

    • B. 

      Polymerase

    • C. 

      Reverse transcriptase

    • D. 

      Endonuclease

  • 40. 
    Microorganisms that require a low level of oxygen for growth are:
    • A. 

      Capnophiles

    • B. 

      Anaerobes

    • C. 

      Aerobes

    • D. 

      Microaerophilic

  • 41. 
    Which of the following is not a technique used in the measurement of bacterial growth?
    • A. 

      Turbidity

    • B. 

      Radioimmunoassay

    • C. 

      Coulter counter

    • D. 

      Cell counts

  • 42. 
    Bacteria which require high concentrations of salt (NaCl) are:
    • A. 

      Halophiles

    • B. 

      Acidophiles

    • C. 

      Alkalineophiles

    • D. 

      Barophiles

  • 43. 
    The enzyme RNA polymerase is needed for the synthesis of:
    • A. 

      RRNA

    • B. 

      TRNA

    • C. 

      DNA

    • D. 

      MRNA

  • 44. 
    Microbicidal agents are more effective against _______ cells in a population.
    • A. 

      Older

    • B. 

      Younger

  • 45. 
    In a bacterial growth curve the time during which the growth rate is equal to the death rate is the _________ phase.
    • A. 

      Lag

    • B. 

      Log

    • C. 

      Stationary

    • D. 

      Death

  • 46. 
    Chemical agents called surfactants act on the microorganism's _________.
    • A. 

      Proteins

    • B. 

      Cell wall

    • C. 

      Cell membranes

    • D. 

      Nucleic acids

  • 47. 
    The process of heat applied to liquids to destroy infectious and spoilage agents while retaining the liquids flavor and food value is called ____________.
    • A. 

      Steam autoclaving

    • B. 

      Pasteurization

    • C. 

      Dry heat

    • D. 

      Boiling

  • 48. 
    If the anticodon on transfer RNA is UGA the matching codon on messenger RNA is:
    • A. 

      AGA

    • B. 

      ACU

    • C. 

      UTA

    • D. 

      UCA

  • 49. 
    The term ______ refers to organisms living in an obligatory but mutually beneficial relationship.
    • A. 

      Commensalism

    • B. 

      Parasitism

    • C. 

      Mutualism

    • D. 

      Habituism

  • 50. 
    Sterilizing medical products such as drugs, vaccines and medical instruments is carried out with _____________ radiation.
    • A. 

      Ionizing

    • B. 

      Nonionizing