biologynotes

biologynotes - Life's Levels of Organization -world of life...

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Life’s Levels of Organization -world of life shows levels of organization from the simple to the complex, which extend throughout Cells o Smallest unit that can live and reproduce on its own or as part of a multicelled organism. o It has an outer membrane, DNA, and other components. Populations o Group of single-celled or multicelled individuals of the same species occupying a specified area. Communities o All populations of all species occupying a specified area. Ecosystems o A community that is interacting with its physical enviroment. o It has inputs and outputs of energy and materials. Biosphere o All regions of the Earth’s waters, crust, and atmosphere that hold organisms . In the vast universe, Earth is a rare planet. o Without its abundance of free flowing water, there would be no life Hierarchy of organization Atoms o Smallest unit of an element that still retains the elements properties. o Electrons, protons, and neutrons are its building blocks. Molecules o Two or more joined atoms of the same or different elements. Cells Biosphere Nature shows levels of organization, from the simple to the increasingly complex. Life’s unique characteristics originate at the atomic and molecular level; They extend through cells, population, communities, ecosystems, and the biosphere Molecules of Life - All things m a d e up of the s a m e units of m att er
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o Atoms, molecules - Living things are made up of a certain subset of molecules o Nucleic acids, proteins, carbs, lipids, - Organizations are composed basically similar units – cells – compounds, H20,  organic and four organic compounds o Carbs – energy structures o Lipids – energy; cell membranes; insulation o Proteins – everything, run the cell  o Nucleic acid – genetic molecules DNA,RNA DNA - Signature molecule of life - Molecule of inheritance - Directs the assembly of amino acids - Three major hereditary molecules are nucleic acids that control making proteins and  run the cell - Heritability of DNA - Energy - The basis of metabolism - All organisms utilize energy - reproduce - Energy =  ultimate source - Energy for life is gained through the sun - Autotrophs trap sunlight and turn them into organic molecules - Producers (plants and other organisms) =  autotrophs; make own food molecules  from raw materials - Consumers (animals and decomposers) =   Survive by feeding on tissues of  producers and other organisms - Decomposers  (bacteria and fungi) =Recycle molecules - Energy flows from the sun
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o Transfers from one organism to another o Energy flows in one direction o Eventually all energy flows back to the enviroment *Living organisms respond to themselves and the enviroment *Receptors identify certain forms of energy
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biologynotes - Life's Levels of Organization -world of life...

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