L6 ch 27-34

L6 ch 27-34 - Lecture 6 Portions of Ch-27-34(follow lecture...

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Lecture 6: Portions of Ch-27-34 (follow lecture notes mainly) Biodiversity The Tree of Life: Then and Now Whittaker’s five-kingdom system Plantae fungi animalia -eukarya Protista -eukarya Monera -prokaryotes –archara and bacteria Three Domain System Domain Bacteria and Archaea: Prokaryotes Known as microbes Virtually all are unicellular and prokaryotic Smaller than the cells of eukaryotes Have a cell membrane and a cell wall but lack organelles-no true nuclei More abundant than eukaryotes o Diverse habitats (archaea can be thermophilic; halophilic) o Diverse types of foods 1
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Lecture 6: Portions of Ch-27-34 (follow lecture notes mainly) o One teaspoon of soil contain billions of eukaryotes They are decomposers Part of plankton in aquatic environments Important in medicine, industry, and the quality of the environment. Bacteria can be pathogenic but no archaea are known to cause disease in humans Prokaryotic Features Different shapes Can only move forward and reverse—toward or away from stimuli “taxis” Have some specialized membranes Ring of DNA—0.001 times as much as eukaryotes Prokaryotic Most can divide every 1-3 hours, some produced a new generation in 20 minutes Some can form endospores when exposed to harsh environments Will survive boiling water Will die in 120 degrees C; 248 degrees F Adapt quickly to their environment through natural selection Domain Eukarya: Protists Mostly unicellular eukaryotes
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L6 ch 27-34 - Lecture 6 Portions of Ch-27-34(follow lecture...

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