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University of California, Davis - PLP 120Bacteria 1 Lecture 2017-2.

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Bacteria 1 PLP 120 Dr. Clare Casteel Introduction Viruses Plant pathogens and the tree of life Prokaryotes PROKARYOTES EUKARYOTES Bacteria are prokaryotes. PROKARYOTES EUKARYOTES Bacter... ia are prokaryotes. Single cellular Small 0.6 to 3.5 µm Lack well defined organelles Chromosomal DNA not organized into a nucleus Chromosomal DNA is closed circular Often contain plasmids (extrachrosomal DNA) Multicellular Large cells (10X) Organelles Well defined nucleus containing chromosomal DNA as chromosomes May contain plasmids (some fungi) Prokaryote vs Eukaryote summary • Prokaryotic cells lack a nucleus and a cytoskeleton (mostly), so they do not divide by mitosis • The organization of the genetic material differs: – DNA is not in a nucleus – DNA molecules are often circular – Many have only one chromosome • Prokaryotes have no membrane-enclosed organelles (mitochondria, Golgi apparatus, etc) that are found in eukaryotes [Show More]

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