BIo Lab Essay

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Chapter 1: Introduction: Themes in the Study of Life • Life is organized on many structural levels • Each level of organization has emergent properties • Properties of life • Cells are an organism's basic unit of structure and function • The continuity of life is based on heritable information in the form of DNA • Structure and function are correlated at all levels of biological organization • Organisms are open systems that interact continuously with their environment • Diveristy and unity are the dual faces of life on earth • Evolution is core theme of biology • Science as a process of inquiry often involves hypothetico-deductive reasoning • Biology is connected to our lives in many ways • Biological organization is based on a hierarchy of structural levels, each level building on those levels below. • Proceeds upward from atoms, molecules, organelles, cells, tissues, organs, organ systems, organisms, population, community, ecosystem, biosphere. • Most biologists specialize in the study of life at a particular level, but they gain broader perspective when they integrate their discoveries with processes occurring at lower or higher levels. • Life begets life. • Biogenesis = life comes only from life. • Growth and development • Programmed by DNA • Energy utilization • Organisms take in energy (light or chemical) and transform it to do many kinds of work. • Response to the environment • Homeostasis • Regulatory mechanisms maintain an organism's internal environment within tolerable limits, even though the external environment will fluctuate. • Evolutionary adaptation Life evolves as an interaction between organisms and their environment. • With each step upward in the hierarchy of

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