Published on September 7, 2007
Biology : The Science of Life section 1 The World of Biology section 2 Themes in Biology
Biology and You Biology - “the study of life” the natural world bacteria to elephants food to exercise environment bioethics - biology in context of society
Characteristics of Life Life has changed since it first appeared on the planet, Today, biologist identify a living thing through observation of shared characteristics.
Organization Self-directed Organization cell - basic unit of structure and function (organelles and biomolecules) unicellular or multicellular
levels of organization cells tissues organs organ system organism population --> community --> ecosystem --> biome -->biosphere
Response to Stimuli stimulus-response stimulus - causal event in environment response - reaction to causal event
Homeostasis responses in an organism which maintain stable internal conditions in a changing environment light, temperature, water
Growth and Development growth - increase in size growth - increase in the number of cells through cell division development - series of changes during growth due to cell specialization
Reproduction making more of ones own kind - species asexual sexual Inherited set of instructions in the nucleic acids DNA or RNA
Evolution species change over time mutation variations in a population differential survival due to “fitness”
Metabolism Energy required for each characteristic metabolism - sum of chemical reactions to transform energy to a usable form photosynthesis - respiration provide material for growth and repair
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