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Bacteria

  • Domain Bacteria is composed of prokaryotic organisms that have a circular chromosome and do not have histones associated with their DNA. Additional genes may be located on small, circular pieces of DNA known as plasmids.
  • Although they are unicellular, bacteria can form colonies. A biofilm is a group of bacteria aggregated together on a substrate.
  • Bacteria can be divided into gram positive and gram negative types based on the amount of peptidoglycan in their cell walls.
  • Some bacteria are covered by a capsule that helps them to evade their host’s immune system.
  • Flagella area a means of motility for bacteria and are composed of a basal apparatus, filament and hook.
  • Bacteria reproduce asexually through binary fission.
  • During conjugation, DNA is transferred form one bacterial cell to another. The F factor codes for a sex pilus through which the transfer takes place.
  • Bacteria play an important role in biotechnology. Through the process of transformation, bacteria take up DNA from their environment. The bacteria can then express the gene, producing a protein.

Bacteria

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AP Biology Intro