AP Biology Chapter 12 Quiz

10 Questions | Total Attempts: 95

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AP Biology Chapter 12 Quiz

Individual effort, one log-in/submission attempt, 60 minute timed assessment of concepts from Chapter 12.


Questions and Answers
  • 1. 
    If 30% of an organism's DNA is thymine, then:
    • A. 

      70% is purine.

    • B. 

      20% is guanine.

    • C. 

      30% is adenine.

    • D. 

      70% is pyrimidine.

  • 2. 
    The double-helix model of DNA resembles a twisted ladder in which the rungs of the ladder are:
    • A. 

      A purine paired with a pyrimidine.

    • B. 

      A paired with G and C paired with T.

    • C. 

      Sugar-phosphate paired with sugar-phosphate.

    • D. 

      A 5 prime end paired with a 3 prime end.

  • 3. 
    DNA replication is said to be semiconservative because:
    • A. 

      One of the new molecules conserves both of the original DNA strands.

    • B. 

      The new DNA molecule contains two new DNA strands.

    • C. 

      Both of the new molecules contain one new strand and one old strand.

    • D. 

      DNA polymerase conserves both of the old strands.

  • 4. 
    Select all the choice(s) that apply.  In a DNA molecule:
    • A. 

      The bases are covalently bonded to the sugars.

    • B. 

      The sugars are covalently bonded to the phosphates.

    • C. 

      The bases are hydrogen-bonded to one another.

    • D. 

      The nucleotides are covalently bonded to one another.

  • 5. 
    If the sequence of bases in one strand of DNA is 5' TAGCCT 3' then the sequence of bases in the other strand will be:
    • A. 

      3' TCCGAT 5'

    • B. 

      3' ATCGGA 5'

    • C. 

      3' TAGCCT 5'

    • D. 

      3' AACGGUA 5'

  • 6. 
    Transformation occurs when:
    • A. 

      DNA is transformed into RNA.

    • B. 

      DNA is transformed into protein.

    • C. 

      Bacteria cannot grow on penicillin.

    • D. 

      Organisms receive foreign DNA and thereby acquire a new characteristic.

  • 7. 
    Select the choice(s) that apply.  Pyrimidines:
    • A. 

      Are always paired with a purine.

    • B. 

      Are thymine and cytosine.

    • C. 

      Keep DNA from replicating too often.

    • D. 

      Are adenine and guanine.

  • 8. 
    Select the choice(s) that apply.  Watson and Crick incorporated which of the following into their model of DNA structure?
    • A. 

      Franklin's diffraction data.

    • B. 

      Chargaff's rules.

    • C. 

      Complementary base pairing.

    • D. 

      Alternating sugar-phosphate backbone.

  • 9. 
    A nucleotide:
    • A. 

      Is smaller than a base.

    • B. 

      Is a subunit of a nucleic acid.

    • C. 

      Has a lot of variable parts.

    • D. 

      Has at least four phosphates.

    • E. 

      Always joins with other nucleotides.

    • F. 

      Always joins with other nucleotides.

  • 10. 
    During replication, separation of DNA strands requires:
    • A. 

      Backbones to split.

    • B. 

      Nucleotides to join together.

    • C. 

      Hydrolysis and synthesis to occur.

    • D. 

      Hydrogen bonds to unzip.

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