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Prokaryotic Cells01:51

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Prokaryotes are small unicellular organisms that include the domains—Archaea and Bacteria. Bacteria include many common organisms, such as Salmonella and E. coli, while the Archaea include extremophiles that live in harsh environments, such as volcanic springs.
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The genome of most prokaryotic organisms consists of double-stranded DNA organized into one circular chromosome in a region of cytoplasm called the nucleoid. The chromosome is tightly wound, or supercoiled, for efficient storage. Prokaryotes also contain other circular pieces of DNA called plasmids. These plasmids are smaller than the chromosome and often carry genes that confer adaptive functions, such as antibiotic resistance.
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Bacteriophages, or phages, are viruses that specifically infect bacteria, utilizing their genetic material to hijack host cellular machinery for replication. DNA bacteriophages employ single-stranded DNA (ssDNA) or double-stranded DNA (dsDNA) genomes. These phages exhibit diverse replication strategies and host interactions, influencing their ecological roles and applications in biotechnology and medicine.ssDNA BacteriophagesssDNA phages, with their small genomes, utilize unique strategies to...
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Testing the Role of Multicopy Plasmids in the Evolution of Antibiotic Resistance
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The bacterial chromosome.

Milton H Saier1

  • 1Division of Biological Sciences, University of California at San Diego, La Jolla, California 92093-0116, USA. msaier@ucsd.edu

Critical Reviews in Biochemistry and Molecular Biology
|March 28, 2008
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Summary
This summary is machine-generated.

Bacterial genomes are highly dynamic, with numerous mechanisms driving genomic plasticity. This review explores DNA structure, function, and evolution in prokaryotes, highlighting key processes underlying genome dynamics.

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Area of Science:

  • Microbiology
  • Genomics
  • Molecular Biology

Background:

  • Bacteria constitute the majority of Earth's biological diversity.
  • Understanding bacterial genetic material is crucial for comprehending organismal diversity.
  • Genomic plasticity in bacteria is more significant than previously thought.

Purpose of the Study:

  • To review selected aspects of bacterial genetic material.
  • To provide insights into structural, functional, dynamic, and evolutionary aspects of bacterial genomes.
  • To examine well-understood processes underlying genomic structure and function dynamics in prokaryotes.

Main Methods:

  • Review of existing literature on bacterial genomics.
  • Analysis of mechanisms contributing to genomic plasticity.
  • Examination of DNA structure/function relationships.

Main Results:

  • Bacterial chromosomes exhibit significant dynamism.
  • Dozens of mechanisms for genomic plasticity are now understood.
  • The genomics era provides tools to unravel complex DNA structure/function relationships.

Conclusions:

  • Bacterial genome dynamics are fundamental to their diversity.
  • A deeper understanding of prokaryotic genome plasticity is available.
  • Key processes governing bacterial genome structure and function have been elucidated.