What Is Microbiology Quiz?

483 Questions | Total Attempts: 145

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What Is Microbiology Quiz?

Take this quiz and learn more about microscopic organisms, such as bacteria, viruses, archaea, fungi and protozoa. Let's begin this science quiz!


Questions and Answers
  • 1. 
    Which graph in Figure 7.2 best depicts the effect of placing the culture at 7°C at time x?
    • A. 

      A

    • B. 

      B

    • C. 

      C

    • D. 

      D

    • E. 

      E

  • 2. 
    A gene is best defined as
    • A. 

      A segment of DNA

    • B. 

      Three nucleotides that code for an amino acid

    • C. 

      A sequence of nucleotides in DNA that codes for a functional product

    • D. 

      A sequence of nucleotides in RNA that codes for a functional product

    • E. 

      A transcribed unit of DNA

    • F. 

      Hard-wearing trousers made of denim or other cotton fabric, for informal wear

  • 3. 
    Which of the following pairs is mismatched
    • A. 

      DNA polymerase — makes a molecule of DNA from a DNA template

    • B. 

      RNA polymerase — makes a molecule of RNA from an RNA template

    • C. 

      DNA ligase — joins segments of DNA

    • D. 

      Transposase — insertion of DNA segments into DNA

    • E. 

      DNA gyrase — coils and twists DNA

  • 4. 
    Which of the following statements is FALSE?
    • A. 

      DNA polymerase joins nucleotides in one direction only.

    • B. 

      The leading strand of DNA is made continuously.

    • C. 

      The lagging strand of DNA is started by an RNA primer

    • D. 

      DNA replication proceeds in one direction around the bacterial chromosome

    • E. 

      Multiple replication forks are possible on a bacterial chromosome.

  • 5. 
    DNA is constructed of
    • A. 

      A single strand of nucleotides with internal hydrogen bonding

    • B. 

      Two complementary strands of nucleotides bonded A—C and G—T

    • C. 

      Two strands of nucleotides running antiparallel

    • D. 

      Two strands of identical nucleotides with hydrogen bonds between them

    • E. 

      None of the answers is correct.

  • 6. 
    Which of the following is NOT a product of transcription?
    • A. 

      A new strand of DNA

    • B. 

      RRNA

    • C. 

      TRNA

    • D. 

      MRNA

    • E. 

      None of the answers are correct; all of these are products of transcription

  • 7. 
    Which of the following statements about bacteriocins is FALSE?
    • A. 

      The genes coding for them are on plasmids.

    • B. 

      They cause food-poisoning symptoms.

    • C. 

      Nisin is a bacteriocin used as a food preservative

    • D. 

      They can be used to identify certain bacteria

    • E. 

      Bacteriocins kill bacteria

  • 8. 
    Which colonies are streptomycin-resistant and leucine-requiring?
    • A. 

      1, 2, 3, and 9

    • B. 

      3 and 9

    • C. 

      4, 6, and 8

    • D. 

      4 and 8

    • E. 

      5 and 6

  • 9. 
    Culture 1:  F+, leucine+, histidine+Culture 2:  F-, leucine-, histidine- What will be the result of conjugation between cultures 1 and 2?
    • A. 

      1 will remain the same; 2 will become F+, leucine-, histidine-

    • B. 

      1 will become F-, leu+, his+; 2 will become F+, leu-, his-

    • C. 

      1 will become F-, leu-, his-; 2 will remain the same

    • D. 

      1 will remain the same; 2 will become F+, leu+, his+

    • E. 

      1 will remain the same; 2 will become F+ and recombination may occur

    • F. 

      1 will remain the same; 2 will spend years trying to change 1, but never succeed

  • 10. 
    Culture 1:  F+, leucine+, histidine+Culture 2:  F-, leucine-, histidine- If culture 1 mutates to Hfr, what will be the result of conjugation between the two cultures?
    • A. 

      They will both remain the same.

    • B. 

      1 will become F+, leu+, his+; 2 will become F+, leu+, his+

    • C. 

      1 will remain the same; recombination will occur in 2

    • D. 

      1 will become F-, leu+, his+; 2 will become Hfr, leu+, his+

    • E. 

      The answer cannot be determined based on the information provided.

  • 11. 
    An enzyme produced in response to the presence of a substrate is called a(n)
    • A. 

      Inducible enzyme

    • B. 

      Repressible enzyme

    • C. 

      Restriction enzyme

    • D. 

      Operator

    • E. 

      Promoter

  • 12. 
    When glucose is high, cAMP is _____ : CAP _____ bind the lac operator, and RNA polymerase _____ bind the lac promoter.
    • A. 

      High; does; does

    • B. 

      Low; does not; does not

    • C. 

      High; does not; does

    • D. 

      Low; does not; does

    • E. 

      None of the answers is correct.

  • 13. 
    Transformation is the transfer of DNA from a donor to a recipient cell
    • A. 

      By a bacteriophage.

    • B. 

      As naked DNA in solution

    • C. 

      By cell-to-cell contact

    • D. 

      By crossing over

    • E. 

      By sexual reproduction

  • 14. 
    Genetic change in bacteria can be brought about by
    • A. 

      Mutation

    • B. 

      Conjugation

    • C. 

      Transduction

    • D. 

      Transformation

    • E. 

      All of the answers are correct

  • 15. 
    Which of the following statements regarding a bacterium that is R+ is FALSE?
    • A. 

      It possesses a plasmid

    • B. 

      R+ can be transferred to a cell of the same species

    • C. 

      It is resistant to certain drugs and heavy metals

    • D. 

      It is F+

    • E. 

      R+ can be transferred to a different species

  • 16. 
    The initial effect of ionizing radiation on a cell is that it causes
    • A. 

      DNA to break

    • B. 

      Bonding between adjacent thymines

    • C. 

      Base substitutions

    • D. 

      The formation of highly reactive ions

    • E. 

      The cells to get hot

  • 17. 
    According to the operon model, for the synthesis of an inducible enzyme to occur, the
    • A. 

      End-product must not be in excess

    • B. 

      Substrate must bind to the enzyme

    • C. 

      Substrate must bind to the repressor

    • D. 

      Repressor must bind to the operator

    • E. 

      Repressor must not be synthesized

  • 18. 
    Synthesis of a repressible enzyme is stopped by the
    • A. 

      Allosteric transition

    • B. 

      Substrate binding to the repressor

    • C. 

      Corepressor binding to the operator

    • D. 

      Corepressor-repressor complex binding to the operator

    • E. 

      End product binding to the promoter

  • 19. 
    If base 4 is thymine, what is base 4'?
    • A. 

      Adenine

    • B. 

      Thymine

    • C. 

      Cytosine

    • D. 

      Guanine

    • E. 

      Uracil

  • 20. 
    If base 4 is thymine, what is base 11'
    • A. 

      Adenine

    • B. 

      Thymine

    • C. 

      Cytosine

    • D. 

      Guanine

    • E. 

      Uracil

  • 21. 
    Base 2 is attached to
    • A. 

      Ribose

    • B. 

      Phosphate

    • C. 

      Deoxyribose

    • D. 

      Thymine

    • E. 

      The answer cannot be determined based on the information provided

  • 22. 
    The damage caused by ultraviolet radiation is
    • A. 

      Never repaired

    • B. 

      Repaired during transcription

    • C. 

      Repaired during translation

    • D. 

      Cut out and replaced

    • E. 

      Repaired by DNA replication

  • 23. 
    Refer to Table 8.2. If the sequence of amino acids encoded by a strand of DNA is serine-alanine-lysine-leucine, what is the order of bases in the sense strand of DNA?
    • A. 

      3' UGUGCAAAGUUA

    • B. 

      3' AGACGTTTCAAT

    • C. 

      3' TCTCGTTTGTTA

    • D. 

      5' TGTGCTTTCTTA

    • E. 

      5' AGAGCTTTGAAT

  • 24. 
    Refer to Table 8.2. If the sequence of amino acids encoded by a strand of DNA is serine-alanine-lysine-leucine, the coding for the antisense strand of DNA is
    • A. 

      5’ ACAGTTTCAAT

    • B. 

      5’ TCTGCAAAGTTA

    • C. 

      3’ UGUGCAAAGUUA

    • D. 

      3’ UCUCGAAAGUUA

    • E. 

      3’ TCACGUUUCAAU

  • 25. 
    Refer to Table 8.2 The anticodon for valine is
    • A. 

      GUU

    • B. 

      CUU

    • C. 

      CTT

    • D. 

      CAA

    • E. 

      GTA

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