BIOL 2020 Lecture 3: BIOL 2020 - Lecture 3
13 Jan 2019
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Biol 2030 lecture 3 january 11, 2019. Two classes of cells: prokaryotic (bacteria, archaea, evolved earlier than eukaryotes, no membrane-bound nucleus (instead, a nucleoid region, circular chromosomal dna, cytoplasm mostly devoid of membranous structures, 1 5 m. Archaea include: methanogens (energy from hydrogen, converts co2 methane, halophiles (thrive in salty environments, thermacidophiles (live in acidic hot springs -> low ph or hot temperature) Archaea are more closely related to us than to bacteria. Archaea live in extreme environment or have unique metabolic strategies. Archaea and eukarya evolved from a common ancestor that diverged from bacteria a long long time ago: eukaryotic (protists, yeast, fungi, plants, animals, bigger than prokaryotes (10 100 m, evolved more recently, compartmentalized organelles; membrane-bound nucleus. General truths about cell biology: cells are small. Entire cells, or large organelles, are measured in micrometers ( m). Most other cell structures are measured in nanometers (nm).
