UT Knoxville BIOL 140 - Chapter 1 (30 pages)

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Chapter 1



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Chapter 1

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Pages:
30
School:
University of Tennessee
Course:
Biol 140 - Organization/Function of Cell
Organization/Function of Cell Documents

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Chapter 1 2011 Pearson Education Inc What Does It Mean to Say That Something Is Alive All living organisms share five fundamental characteristics Energy All organisms acquire and use energy Cells All organisms are made up of membrane bound cells Information All organisms process hereditary information encoded in genes as well as information from the environment Replication All organisms are capable of reproduction Evolution Populations of organisms are continually evolving 2011 Pearson Education Inc Theories A theory is an explanation for a very general class of phenomena or observations Theories have two components Pattern Something that occurs in the natural world Process Responsible for creating the pattern Two theories form the framework for modern biological science The cell theory The theory of evolution by natural selection 2011 Pearson Education Inc The Cell Theory In the late 1660s Robert Hooke and Anton van Leeuwenhoek were the first to observe cells A cell is a highly organized compartment bounded by a plasma membrane that contains concentrated chemicals in an aqueous solution The cell theory states that All organisms are made of cells pattern All cells come from preexisting cells process 2011 Pearson Education Inc Louis Pasteur s Experiment A hypothesis is a proposed explanation A prediction is something that can be measured and must be correct if a hypothesis is valid Louis Pasteur proved that cells arise from cells and not by spontaneous generation 2011 Pearson Education Inc 2011 Pearson Education Inc 2011 Pearson Education Inc 2011 Pearson Education Inc Implications of the Cell Theory Because all cells come from preexisting cells all individuals in a population of single celled organisms are related by common ancestry All of the cells present in a multicellular organism have descended from preexisting cells and are connected by common ancestry 2011 Pearson Education Inc The Theory of Evolution by Natural Selection In 1858 Charles Darwin and Alfred



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