BIOL 141 Chapter Notes - Chapter 1: Nucleic Acid Double Helix, Phylogenetic Tree, Francis Crick
31 Aug 2017
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Chapter 1: biology and the tree of life. Analyzing how organisms work at the molecular level. Understanding organisms in terms of their evolutionary history. Helping you learn to think like a biologist. 1. 1 what does it mean to say that something is alive. Organism: a life-form, a living entity made up or one or more cells. Cells: organisms are made up of these membrane-bound units. Membrane regulates passage of materials in and out. Evolution: populations continue to evolve and are products of evolution. Energy: acquire and use energy to stay alive and reproduce. Theory: an explanation for a general class of phenomena or observations supported by a wide body of evidence. Cell theory: the cell is the fundamental structural unit in all organisms. The characteristics of species can be modified from generation to generation. Theory of evolution: all species are related by common ancestry and have changed over time in response to natural selection.
