BIO 181 1st Edition Lecture 10Outline of Past LectureI. Evolution of BacteriaII. Human EvolutionIII. ExtinctionIV. Systematic organizationOutline of Current LectureI. Diversity of Life II. ProkaryoticIII. Eukaryotic IV. Diversity of Lifea. The three domain systemsi. Prokaryotic: which breaks up into bacteria and archaea, ii. Eukaryoticiii. these domains are not considered alive because1. not composed of cells2. needs a host to liveV. Prokaryotica. Bacteria: no nuclei, prokaryotic cells, can cause disease in humansi. about 50 million bacteria are on every square in of human skinii. 10% of your body weight is bacteria iii. Eubacteria1. no introns in gene: entire gene used to make protein2. peptidoglycan in cell wall: staining substances that lets us know how much of bacteria is in a cell by dying it3. shapes are cocci, bacilli spirala. cocci: spherical b. bacilli: rod-shapedi. lactobacillus, bacillusc. spirilla: spirali. ex: rhodospirillumd. they only move forward or away from stimuli4. cyanobacteria: use to be known as blue green algaea. so abundant produce 20% of the world’s oxygenb. earliest bacteria to produce photosynthesisc. credited with transforming our atmosphere into one thatcontains free oxygen5. Bacteria are tough and do not even die in many harsh conditionsa. ex: can survive in boiling waterb. Archaea: no nuclei, prokaryotic cells does not cause disease in humansi. contains no peptidoglycan1. cell membrane has lipids not found in other organisms2. live everywhere and are extremely abundant in plankton3. extremophiles: extreme areasa. methanogens: produce methane poison in oxygenb. thermophiles: extreme temp, hot and coldc. halophiles: salty areasc. prokaryotic: can copy its plasma and inject it into another bacteria celli. this is known as conjugationii. Bacteria used in daily things1. nitrogen fixation2. use of bacteria in medicine3. use of it in foodsa. example: yogurtVI. Eukaryotica. Protistai. Unicellularii. 10x larger than most bacteriaiii. can form different communityiv. feeding:1. ingestion or absorptive systems2. eat through ingestion or absorptiona. feeds on live or dead organismv. Ecological Importance of Protista1. phytoplankton are responsible for producing half of our oxygen on a regular basis, and they are Protista2. symbiotic relationshipa. parasitic: cause diseasesi. ex: malariab. mutualisticc. Protista are seen in toothpastei. foods: ice-creams, candy and gelsii. seen in cleaners, plastic, paintsiii. treatment for high blood
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