Bio Test 3 (Part 1)

11 Questions | Total Attempts: 49

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Biology Quizzes & Trivia

Bio test part 1 of 5. 55 question test.


Questions and Answers
  • 1. 
    The significance of Fred Griffith's experiment in which he used two strains of Streptococcus pneumoniae is that
    • A. 

      Harmless and pathogenic bacteria function differently in mice than in other organisms.

    • B. 

      It demonstrated that harmless bacteria can become transformed into disease-causing bacteria by some association with pathogenic bacteria.

    • C. 

      It established that pure DNA extracted from disease-causing bacteria transformed harmless strains into killer strains.

    • D. 

      Dead cells lose their genetic information.

    • E. 

      The genetic material is DNA, not protein.

  • 2. 
    The significance of the Hershey and Chase experiments in which 32P and 35S were used is that
    • A. 

      DNA labeled with 35S and proteins labeled with 32P can be traced in the course of an experiment

    • B. 

      They demonstrated that DNA labeled with 32P is transferred from the bacteriophage to the virus.

    • C. 

      They established that proteins labeled with 35S become deactivated and unable to be transferred.

    • D. 

      They demonstrated that bacteriophages transfer their DNA, not their protein coats, into their hosts.

    • E. 

      DNA may be the hereditary material; although bacteriophages transfer both DNA and proteins into their hosts.

  • 3. 
    DNA polymerase assembles new strands
    • A. 

      In a 5' to 3' direction only.

    • B. 

      In a 5' to 3' direction building one strand and a 3' to 5' direction building the second half of a strand.

    • C. 

      In a 5' to 3' direction building the first half of a strand and a 3' to 5' direction building the second half of a strand.

    • D. 

      In a 3' to 5' direction building the first half of a strand and a 5' to 3' direction building the second half of a strand.

    • E. 

      In a 3' to 5' direction on the "old" 3' to 5' strand.

  • 4. 
    A linear stretch of DNA that specifies the sequence of amino acids in a polypeptide is called a(n)
    • A. 

      Codon.

    • B. 

      Intron.

    • C. 

      Messenger.

    • D. 

      Gene.

    • E. 

      Enzyme.

  • 5. 
    Before leaving the nucleus, the RNA molecule
    • A. 

      Acquires a poly-A tail.

    • B. 

      Is released from the STOP signal on the template.

    • C. 

      Becomes capped.

    • D. 

      Is stripped of its introns.

    • E. 

      All of these.

  • 6. 
    The genetic code
    • A. 

      Is nearly universal for all organisms.

    • B. 

      Is based upon 64 codons made of sequences of three nucleotides.

    • C. 

      Also comes equipped with "punctuation marks."

    • D. 

      Is redundant, that is, many amino acids have more than one codon.

    • E. 

      All of these.

  • 7. 
    Each "word" in the mRNA language consists of how many letters?
    • A. 

      3

    • B. 

      4

    • C. 

      5

    • D. 

      More than 5

    • E. 

      None of these

  • 8. 
    Refer to Figure 14-1. AUGCGUCCAThe sequence of amino acids specified by this mRNA is
    • A. 

      Serine -- histidine -- lysine.

    • B. 

      Methionine -- arginine -- proline.

    • C. 

      Methionine -- alanine -- serine.

    • D. 

      Valine -- arginine -- leucine.

    • E. 

      None of these.

  • 9. 
    Sickle-cell anemia has been traced to what type of mutation?
    • A. 

      Frameshift

    • B. 

      Transposable element

    • C. 

      Mutagenic

    • D. 

      Base-pair substitution

    • E. 

      Viral

  • 10. 
    In a mutation,
    • A. 

      The new codon may specify a different amino acid but may not change the function of the new protein produced.

    • B. 

      The new codon may specify the same amino acid as the old codon.

    • C. 

      The new codon and resulting amino acid may destroy the function of the protein specified.

    • D. 

      The new codon may specify no amino acid.

    • E. 

      All of these may be true.

  • 11. 
    The color distribution in the fur of calico cats results from
    • A. 

      Hybridization.

    • B. 

      A specific nutritional deficiency.

    • C. 

      A genetic defect.

    • D. 

      X chromosome inactivation.

    • E. 

      Selective breeding.