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Unformatted text preview: Biology 1404 Notes 1/18/11 Chapter 1 notes:- Introduction themes in the study of life: o Overview Reproduction- is a key property of life Evolution- the process of change that has transformed life on Earth from its earliest beginnings to the diversity of org. living today it is the fundamental org. principle of biology and a main theme Scientific inquiry- posing questions about the living world and seeking science- based answers. Central activities to biology. Biology- the scientific study of life Woven into the fabric of everyday life Pg.2 figure 1.3 Some properties of life Order Evolutionary adaption Regulation Reproduction Growth and development Energy processing Resp. to environment o Themes connect concept of biology Evolution- bios core theme May look different, but similar skeletons Evolution = the idea that organisms living on earth today are modified descendants of common ancestors Emergent properties- are due to the arrangement and interactions of parts as complexity increases Ex. If had test tube mix. Of chlorophyll and all the other kinds of molecules found in a chloroplast, photosynthesis will not occur o Photosynthesis can take place only when the molecules are arranged in a specific way in an intact chloroplast. o Emergent prop. Are not unique to life Power and limitations of reductionism Reductionism- the reduction of complex systems to simpler components that are more manageable to study Ex. Studying the molecular structure of DNA taken from cells , James Watson and Francis crick inferred (1953) how this molecule could serve as that chemical basis of inheritance The role of DNA in cells becomes better understood Exploring levels of biological organizations 1. The biosphere- consists of all the env. On earth that are inhabited by life 2. Ecosystems- consists of all living things in a particular area, along with nonliving components of the env. With which life interacts 3. Communities- the entire array of org. inhabiting a part. Ecosystem is called a biological community. o Each of these forms of life is called a species. 4. Populations- consists of all ind. Species living within the bounds of a specified area 5. Organisms- ind. Living things 6. Organs and organ systems o Organ- a body part consisting of 2 or more tissues Carries out part. Function in body 7. Tissues- skin of the surface 8. Cells- lifes fundamental unit of structure and function o Can be singular or multicellular 9. Organelles- the various func. Components that make up a cell 10. Molecules- a chem. Structure consisting of 2 or more small chem. Units called atoms....
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