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Bio Exam 3

QuestionAnswer
Gaia Hypothesis Frederic Clements said Ecology was to the study of communities like physiology was to the study of individual organisms. James Lovelock, responsible for Gaia hypothesis said we should consider the entire planet as a living organism.
Domain Taxonomic category above kingdom. Inclusion within a particular domain requires similarities in basic cellular biochemistry. 3 domains: bacteria, archaea, eukarya with archaea and eukarya being more similar than bacteria.
Bacteria Vs. Archaea (bacteria differ in having) 1. Different RNA sequence 2. Peptidoglycan cell well that can be thin or dick 3. No distinctive lipid (branched hydrocarbon) layer around cell 4. Many disease causing representatives, archaea dont cause disease.
Bacteria benefits important to all life processes and to the biogeochemical cycling of nutrients.
Gram - Positive Bacteria (2,200 sp) stains purple with crystal violet, specific for thick peptidoglycan layer in cell wall that traps crystal violet within cell cytoplasm). ex: bacillus thuringiensis, source of biological control used to produce insecticides; lactobacillus, source of chees
Proteobacteria (gram negative bacteria; 1200 sp) Thick phospholipid bilayer, impedes antibiotic drugs and host immune system. Thin inner peptidoglycan layer.
Proteobacteria : ubiquitous, disease causing forms E. coli; harmless strains synthesize vitamin K and protect humans from pathogenic bacteria, other strains cause food poisoning Salmonella; colonize protein rich foods Yersinia: Bubonic plague, skin hemorrhage
Proteobacteria : symbiotic, nitrogen fixing bacteria Rizobium Bradyrizobium occur symbiotically in legumes of plants. increase the availability of nitrogen by fixing N2 gas into ammonia. Plans can use to make amino acids, proteins, and nucleic acids. Plants provide bacteria sugar
Created by: yochrishey
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