Week 1 & Week 2 - IntroductionandChemistryofLife...

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Introduction and Chemistry of Life 23/01/2008 14:16:00 Levels of Organization Individual Population Community Ecosystem Biosphere No single definition applies to all forms of life, instead of defining life, we  can only characterize it. Living things contain: Nucleic acids Proteins Carbohydrates Lipids Living Organisms Share Basic Characteristics Contain biomolecules o Listed above (living things contain) Composed of cells o Cells are the smallest unit of life
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Living things are composed of cells These are red blood cells (disks) and a white cell  (sphere). All cells come from preexisting cells Cells can divide to form new cells, reproduction, growth,  and repair are possible. Reproduce o All living organisms produce other organisms of their same kind Ex. Passing on our genetic material to our offspring Living things reproduce Acquire and use energy and raw materials o Metabolic activities allow organisms to extract energy from various  nutrients and transform it to do many kinds of work. o Nutrients and energy from the food you eat Ex. Living things use energy and raw materials Respond to Stimuli o Sensory organs which are used to detect stimuli in the environment Ex.  Living things respond Chameleon sees and catches its prey Maintain homeostasis o Maintain stable and internal environment Ex Temperature  If hot, cool yourself off Populations evolve
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o Individuals with heritable traits are most like to survive and reproduce,  to pass on those traits Ex. The orchid uses other plants for support so that it can  receive enough sunlight to produce its own food by  photosynthesis Adaptive traits  – Traits that help it survive and reproduce in its  natural environment. Life has many levels of organizations Life extends from the microscopic to global scale (IN BOOK) o Molecule The chemical components of cells o Cell The smallest unit of life o Tissue A group of similar cells that perform the same function o Organ A structure with two or more tissues working together to perform  a function o Organ System At least two organs working together to perform a function o Individual A single organisms o Population All individuals of the same species in an area
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o Community All the species in an ecosystem that can interact A community might be all the species that live and  interact in an alpine meadow o Ecosystem A community and its physical life All the living organisms in a defined area and their  physical environment Can be defined as the whole earth, a particular forest, or 
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This note was uploaded on 04/22/2009 for the course BIO 309D taught by Professor Jessicawandelt during the Spring '08 term at University of Texas at Austin.

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Week 1 & Week 2 - IntroductionandChemistryofLife...

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