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Lecture 7

BIO SCI 94 Lecture Notes - Lecture 7: Paraphyly, Cell Membrane, Cell Wall


Department
Biological Sciences
Course Code
BIO SCI 94
Professor
Nancy Burley
Lecture
7

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“Biota” refers to all the organisms living in a particular place or geological time interval
All extant prokaryotic and eukaryotic organisms possess plasma membrane and
ribosomes, have a common set of metabolic rate including glycolysis and use DNA
Prokaryotes are a paraphyletic group
Paraphyletic group: evolutionary group that includes an ancestral population and
some but not all of its descendants
Monophyletic group: evolutionary group that includes ancestor and all
descendants
prokaryotes :
Unicellular
Cell wall
Haploid
Lack membrane bound nucleus and organelles
Circular chromosome
Fission
Ubiquitous
Differences between bacteria and archaea:
Composition of cell walls
Transcription
Translation
Prokaryotic abundance:
Handful of soil contains > 50 billion cells
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