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Bio311C F11 L1OL - • Chemical cycling in ecosystem •...

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Introduction: Biological Themes
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Themes in the study of life
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Shared Characteristics of Life Contain biomolecules Composed of one or more cells Use nearly universal genetic code Obtain and use energy and raw materials Respond to environment Regulation of internal environment Grow and reproduce Evolve
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Hierarchical Organization of Life The study of life extends from the microscopic scale to the global scale Levels build on one another in biological hierarchy New properties emerge due to interactions and arrangements of parts
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Structure and function are correlated Form and function are intimately related at all levels of biological organization
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The cell is the basic unit of life Prokaryotic cells Eukaryotic cells
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Organisms interact with their environment Exchange matter and energy
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Unformatted text preview: • Chemical cycling in ecosystem • Energy flow through ecosystem DNA is Life’s Blueprint • Determines structure and metabolic activities of cells/organisms – Genes store information for building proteins – Gene expression – DNA RNA protein • Allows reproduction and inheritance – DNA replication – Cell division Organisms regulate their internal environment • Homeostasis: maintenance of relatively stable state • Feedback regulation: end-product of a process regulates that process Evolution accounts for the unity & diversity of life • Unity • Diversity • Organizing the diversity of life – Domain Bacteria – Domain Archaea – Domain Eukarya Scientific knowledge is based on ongoing research...
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