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Wednesday, February 27, 2013

Domains

1. The 3 domain system of nomenclature vs 5 domain system of Whittaker; differences; ancestors of other groups? (529-30)
* 5 kingdom: m integrityra, protista, plantae, fungi, animalia
* Places all in all prokaryotes in single Kingdom and separates 3 principal branches of cellular eukaryotes as separate kingdoms
* Protistamisc
* 3 domain: bacteria, archaea, eukarya
* Uses category celestial orbit as a Superkingdom to emphasize ancient lineages

2. Nutritional and metabolous adaptations that have evolved in the prokaryotes/example (537-40)
* Nutritional
* Photoautotrophs: photosynthetic organisms that capture demoralizesome force and expenditure it to drive the synthesis of organic compounds from carbon paper copy dioxide. Ex: cyanobacteria, plants, algae
* Chemoautotrophs: need only carbon dioxide as carbon source. Oxidize inorganic substances (hydrogen sulfide, ammonia, gerrous ions). Unique to certain prokaryotes.
* Photoheterotrophs: use light energy besides must obtain carbon in organic form. Ex: marine prokaryotes
* Chemoheterotrophs: consume organic molecules for energy and C.

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ex: prokaryotes, protists, fungi, animals, some parasitic plants
* Metabolic
* Obligate aerobes: use O2 for cellular respiration and cant grow without it
* Facultative anaerobes: use O2 if present, but can grow by fermentation in anaerobiotic environment
* Obligate anaerobes: poisoned by O2. Can live by fermentation, use anaerobic respiration
* Metabolic cooperationsymbiotic relationship; heterocytes
* Nitrogen fixation: atomic number 7 to ammoniaamino acids

3. Conjugation and reproduction in a ciliate, like paramecia (556-58)
* 2 cells of compatible mating strains align side by side and partially fuse
* Meiosis of micronuclei produces 4 haploid micronuclei in each cell
* 3 micronuclei in each cell disintegrate. stay micronucleus in each cell divides by mitosis
* Cells swap one micronucleus
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