Bacterial Plasmids
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Bacterial Plasmids

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Questions and Answers

What was the initial assumption about DNA's ability to store genetic information?

  • That it was too simple (correct)
  • That it was too complex
  • That it was not related to genetic information
  • That it was not crucial

    • What was the purpose of Alfred Hershey and Martha Chase's experiment?

  • To identify the genetic material in pneumococci
  • To investigate if DNA or protein carries genetic information in a bacteriophage (correct)
  • To determine the protein structure of bacteriophage
  • To analyze the nucleotide sequence of DNA

    • What is the characteristic of DNA molecules?

  • They are composed of three polynucleotide chains
  • They are very small
  • They are not helical in structure
  • They are usually composed of two polynucleotide chains coiled together (correct)

    • What occurs when the rotation of a coil is restrained?

    <p>It coils on itself</p> Signup and view all the answers

    What are DNA, RNA, and proteins often called?

    <p>Informational molecules</p> Signup and view all the answers

    What did Oswald Avery and his colleagues set out to discover?

    <p>The genetic material responsible for transformation</p> Signup and view all the answers

    What is the term for a plasmid that integrates into the chromosome?

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

    What is the process called when a bacterium loses a plasmid?

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

    What is a characteristic of plasmid replication?

    <p>It uses the cell's DNA-synthesizing machinery</p> Signup and view all the answers

    What is the purpose of curing treatments?

    <p>To induce the loss of a plasmid from a bacterium</p> Signup and view all the answers

    What determines the effect of a mutation on an organism?

    <p>The environment in which the organism lives</p> Signup and view all the answers

    What is true about the inheritance of plasmids during cell division?

    <p>Plasmids are inherited stably, but may not always be equally apportioned</p> Signup and view all the answers

    What is the function of helicases during DNA replication in bacteria?

    <p>To separate the two parental strands of DNA at the replication forks</p> Signup and view all the answers

    In which direction do DNA polymerases catalyze DNA synthesis?

    <p>5' to 3' direction</p> Signup and view all the answers

    What is the function of topoisomerase during DNA replication?

    <p>To relieve strain by breaking, swiveling, and rejoining DNA strands</p> Signup and view all the answers

    What is the rate of elongation in bacteria during DNA synthesis?

    <p>500 nucleotides per second</p> Signup and view all the answers

    What is the result of each nucleotide added to a growing DNA strand?

    <p>Two phosphate groups are lost</p> Signup and view all the answers

    What is the region where DNA replication occurs called?

    <p>Replication bubble</p> Signup and view all the answers

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