Lecture 2 - Lecture 2 Study Guide August 30 Readings pgs...

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Lecture 2 Study Guide (HOME) August 30 Readings: pgs 1-29 (32-46) Three Important Characteristics Used to Classify Organisms Prokaryotic vs. eukaryotic cells (Examine Fig. 1.4) Prokaryotic cells a. Lack nucleus, other organelles b. Relatively small dimensions: 1-10 micrometers ( m) μ Eukaryotic cells a. DNA packaged in nucleus ; Possess other organelles such as mitochondria b. Relatively Large dimensions: 10- 100 micrometers ( m) μ Aerobic vs. anaerobic metabolism Aerobic – cells require oxygen to break down compounds and produce energy Anaerobic – cells break down compounds and produce energy in the absence of oxygen (facultative and obligate cells) Autotrophic vs. Heterotrophic feeding Autotrophic organisms produce energy from chemical energy source, primarily by photosynthesis Heterotrophic organisms produce energy from by consuming autotrophic organisms
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MAJOR GROUPS OF ORGANISMS This is a combination of Domain and Kingdom levels of organization. We will use the simple characteristics described in the last lecture guide to separate these groups. There are several examples of organisms for each group that you should look over (see links to pictures). Domain Bacteria [Click for pictures] Prokaryotic cells; anaerobic & aerobic metabolism; heterotrophic & autotrophic feeding Cell walls with peptidoglycans; susceptible to many antibiotics (e.g. streptomycin and chloramphenicol) Domain Archaea [Click for pictures] Prokaryotic cells; anaerobic & aerobic metabolism; heterotrophic & autotrophic feeding
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