Bacterial Chromosome and Plasmids
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Questions and Answers

What is the shape of the bacterial chromosome?

  • Helical
  • Circular (correct)
  • Oval
  • Linear

    • What is the replication mode of DNA in bacteria?

  • Conservative
  • Semi-conservative (correct)
  • Independent
  • Liberal

    • What is the characteristic of plasmids?

  • Found only in eukaryotic cells
  • Attached to the bacterial cell membrane
  • Integrated into the bacterial chromosome
  • Self-replicating extra chromosomal DNA molecules (correct)

    • What do R factors code for?

    <p>Antibiotic resistance</p> Signup and view all the answers

    What is the function of F factors?

    <p>Promote transfer of the chromosome at a high frequency of recombination</p> Signup and view all the answers

    What is a characteristic of plasmid distribution in bacterial cells?

    <p>Multiple copies of the same plasmid may be present in each bacterial cell</p> Signup and view all the answers

    What do Col factors code for?

    <p>Extracellular toxin production</p> Signup and view all the answers

    Study Notes

    Bacterial Chromosome

    • The bacterial chromosome is a circular, double-stranded DNA molecule attached to the bacterial cell membrane.

    DNA Replication in Bacteria

    • DNA replication in bacteria is semi-conservative, meaning each original DNA strand is conserved intact during replication and becomes one of the two strands of the new daughter molecules.

    Plasmids

    • Plasmids are self-replicating, extra-chromosomal DNA molecules that multiply independently of the host cell.
    • Multiple copies of the same plasmid can be present in each bacterial cell.
    • Different plasmids can also be present in the same bacterial cell.

    Types of Plasmids

    • R factors: Plasmids that contain genes coding for antibiotic resistance.
    • Col factors: Plasmids that contain genes coding for extracellular toxin (colicines) production, which inhibit strains of the same and different species of bacteria.
    • F (fertility) factors: Plasmids that can recombine with the bacterial chromosome, promoting the transfer of the chromosome at a high frequency of recombination into the chromosome of a second (recipient) bacterial cell during mating.

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    Description

    This quiz covers the structure and replication of bacterial chromosomes and plasmids. Learn about the characteristics of circular DNA, semi-conservative replication, and the independence of plasmids from the host cell.

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