Genetic Material Packaging in Procaryotes and Eucaryotes
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Questions and Answers

What is the membrane-bound organelle where eucaryotic cells have two or more chromosomes?

  • Nucleus (correct)
  • Endoplasmic reticulum
  • Golgi apparatus
  • Mitochondria
  • What is the purpose of exposing crystals of purified bacterial ribosomes to X rays?

  • To increase the size of the ribosomes
  • To rupture the cell membrane
  • To visualize the DNA fibers
  • To analyze the resulting diffraction pattern (correct)
  • Which proteins are involved in looping and coiling bacterial DNA within the nucleoid?

  • Histones
  • Condensins (correct)
  • Ribosomes
  • RNA polymerases
  • In what phylum are membrane-bound DNA-containing regions present as exceptions to the norm of bacterial DNA packaging?

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

    What distinguishes bacterial DNA packaging from that of eukaryotes and some archaea?

    <p>Absence of histone proteins</p> Signup and view all the answers

    What is the unique feature of the nuclear body of Gemmata obscuriglobus among bacteria?

    <p>Bounded by two membranes</p> Signup and view all the answers

    What are plasmids in prokaryotes?

    <p>Extrachromosomal DNA molecules</p> Signup and view all the answers

    How many genes do plasmids generally contain?

    <p>Less than 30 genes</p> Signup and view all the answers

    What is the role of plasmids in host cells?

    <p>Not important for cell function</p> Signup and view all the answers

    How do single-copy plasmids differ from multicopy plasmids?

    <p>Multicopy plasmids produce only one copy per cell</p> Signup and view all the answers

    Which type of replication do plasmids undergo?

    <p>Autonomous replication</p> Signup and view all the answers

    What is the term used to describe plasmids that are able to integrate into the chromosome and are replicated with it?

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

    What is the term for the loss of a plasmid, which can occur spontaneously or be induced by specific treatments?

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

    Which type of plasmids are important in spreading antibiotic resistance among bacteria?

    <p>Conjugative plasmids</p> Signup and view all the answers

    What do bacteriocin-encoding plasmids provide to the bacteria that harbor them?

    <p>Competitive advantage</p> Signup and view all the answers

    Which plasmids carry genes for factors that make their hosts more pathogenic?

    <p>Virulence plasmids</p> Signup and view all the answers

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