Lecture_1_Introdcution_to_Biology

Lecture_1_Introdcution_to_Biology - Biology The Science of...

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6/15/2011 1 Life Sciences 1: Evolution, Ecology, and Biodiversity Summer 2011, Session A Gary Shin, Ph.D. Biology: The Science of Life Biology is the science of life What makes something biological? What makes something scientific? Properties of living things All living things (at some point in their lives): Are made up of one or more cells Contain genetic information (DNA) Reproduce Are genetically related Can obtain molecules and energy from the environment and use these to perform biological functions Can regulate their internal environment Levels of biological organization Atoms Molecules Organelles Cells Tissues Organs Organism Population Community Ecosystem Biosphere Life The cell is the most basic unit of life First observed in the late 17 th century, it wasn’t until the early 19 th century that a generalized cell theory was established, stating: Cells are the basic unit of living organisms Cells arise from other cells All cells are composed of the same basic biochemicals Cellular metabolism All cells (all living things) contain genetic information which encodes proteins, and which is passed on to subsequent generations providing the basis of reproduction
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6/15/2011 2 The unity of life
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