DNA Recombination and Metabolism Quiz
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Questions and Answers

What is the primary mode of movement for transposable elements?

  • Cut-and-paste mechanism (correct)
  • Site-specific recombination
  • Homologous recombination
  • RNA splicing
  • How do some transposable elements differ in their movement?

  • By site-specific recombination
  • Via translation
  • By utilizing an RNA intermediate (correct)
  • Through RNA interference
  • What is a characteristic of relics of mobile genetic elements?

  • They are capable of moving between cells
  • They possess a high degree of mobility
  • They have acquired mutations and are incapable of moving (correct)
  • They integrate into chromosomal DNA
  • How do viruses primarily move between cells?

    <p>RNA intermediates</p> Signup and view all the answers

    What is the composition of about half of the human genome?

    <p>Repeated sequences from mobile genetic elements</p> Signup and view all the answers

    Which type of recombination does not require the alignment of homologous chromosomes?

    <p>Site-specific recombination</p> Signup and view all the answers

    What is the main characteristic of insertion sequences?

    <p>Consist of short repeated sequences at each end</p> Signup and view all the answers

    Which type of transposition involves the excision of the transposon via cuts on each side and its movement to a new location?

    <p>Direct transposition</p> Signup and view all the answers

    What is the primary difference between simple transposons and complex transposons?

    <p>Simple transposons contain only sequences required for transposition, while complex ones contain additional genes.</p> Signup and view all the answers

    What happens to the target-site sequence during replicative transposition?

    <p>It becomes duplicated through DNA replication</p> Signup and view all the answers

    Which enzyme promotes the process of transposition by facilitating the movement of DNA sequences?

    <p>Transposase</p> Signup and view all the answers

    What type of cut is made at the target site during the insertion of a transposon?

    <p>Staggered cut</p> Signup and view all the answers

    What is the primary mechanism cells use to fix a broken chromosome?

    <p>Non-Homologous End Joining (NHEJ)</p> Signup and view all the answers

    During homologous recombination, what is used as a template in repair and meiotic crossover?

    <p>One strand of a chromosome</p> Signup and view all the answers

    In site-specific genetic recombination, what nucleophilic group attacks the phosphodiester bond at the cleavage site?

    <p>Tyrosine hydroxyl group</p> Signup and view all the answers

    What is formed when cleaved DNAs are rejoined during site-specific recombination?

    <p>Holliday intermediate</p> Signup and view all the answers

    What determines the outcome of site-specific genetic recombination?

    <p>The location and orientation of the recombination sites</p> Signup and view all the answers

    If two recombination sites are on the same DNA molecule and have the same orientation, what is the likely outcome?

    <p>Insertion</p> Signup and view all the answers

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