Week 1 Notes
Week 1 Notes BISC 1005
Popular in The Biology of Nutrition and Health
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This 4 page Class Notes was uploaded by SophieSol on Friday September 4, 2015. The Class Notes belongs to BISC 1005 at George Washington University taught by Scully, T in Fall 2015. Since its upload, it has received 141 views. For similar materials see The Biology of Nutrition and Health in Biological Sciences at George Washington University.
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Date Created: 09/04/15
0 Think of the body as an ecosystem o All the living and nonliving factors in a de ned area 0 ie Skin belly button digestive tract Unique organisms related to digestive tract 0 Complexity of life 0 During big bang everything became minute and everything came together as it began to reexpand Everything that exists today exists because of this process 0 Abiotic ingredients Nonliving things Because it took about 10 billion years for living things to come to existence within the intermittent time there were abiotic things 0 Atoms Ingredients make them up 0 Hydrogen is the rst one rst stable atom that was formed as universe aged 0 To make bigger atoms more reactions occurred 0 All atoms are very different composition is very different 0 Where did life originate Earth did not originally have oxygen Within waters compounds were formed and more complex substances began to form organic molecule 0 Substance containing at least one carbon atom and one hydrogen atom o Hydrocarbons when it is just hydrogen and carbon Biotic ingredients living 0 Organic molecules proteins nucleic acids fats carbohydrates Our origins Biotic ingredients came together and by chance compounds came together multiple times 0 Failures but also successful attempts that created our common ancestors All life must be selfcontained barrier from outside world How 0 Cell membrane 0 All have similar characteristics Fatty inside water loving outside 0 Inheritance DNA 0 Make new reproduce o Asexualcloning 0 Sexual exchange or mixture of genetic information 0 Get info anything in environment you can detect and respond to 0 Power 0 All organisms need to bring in energy use it and store it 0 Become an adult 0 Cells must grow growth and develop 0 Sustain 0 Getting in what you need and getting out what you don t need 0 Homeostasis importexport Change 0 Evolution 0 Reproduction 0 Must be able to evolve as a living organism relates back to DNA because changes in DNA will relate to evolution you re changing dynamics of it We have always had interactions with other organisms in order to survive Success 0 Organization of the cell and its process 0 Pill wall ribosomes etc 0 After a billion years we get a new type of cell 0 These allowed us to become multicellular organisms 0 Complex organization 0 Labor division 0 High energy Commonality amongst friends Endosymbiosis Symbiosis 0 When two or more different species live together and interact very close association with each other 0 Not necessarily always bene cial 0 Who is my friend Associations 0 Competition two species interact detrimental to both of them What they are doing is harmful to both Much better off if one didn t exist 0 Niche everything you need to live During competition some part of niche is being interrupted 0 Competition We force this in food production 0 We use pesticides fertilizer etc which stresses other species in the area 75 of antibiotics is used by farmers Equivalent to 30000000 pounds that is used in soil in US farming industry 0 Exploitation One is harmed one bene ts Herbivores Predators Parasites live inon organisms eaten Often cause harm widely spread in foodfood preparation Pathogens o Diseasecausing o Interferes with normal function of an organism How many doses of antibiotics is the average American prescribed by the age of 20 17 0 Farmers using antibiotics Make things bigger 0 Correlation between antibiotics and obesity Commensalism 0 One species bene ts and other is unharmedno cost e Barnacles on whales Mutualism 0 Both species bene t 0 Increasing the survival and reproduction of both of the interacting species Gut inhabitant seed dispersal pollinator Behavioral protection 0 Microbiome is most important All organisms which live in symbiotic relationships with humans 0 Changes constantly 0 Have enzymes that digest substances we cannot Communicate with our immune cells 0 They need us we have not recognized how much we need them Amphibiosis 0 Switch hitters o Transitions between one type of species species interaction to another e Commensalism to exploitation Goodbadneutral bacteria can switch Based on population sizeother present microbes
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