chapter1 - Invitation to Biology Chapter 1 Impacts, Issues:...

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Invitation to Biology Chapter 1
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Impacts, Issues: Lost Worlds and Other Wonders Discovering new plants and animals on an expedition to New Guinea
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1.1 Life’s Levels of Organization We understand life by thinking about nature at different levels of organization Nature’s organization begins at the level of atoms, and extends through the biosphere The quality of life emerges at the level of the cell
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Making Sense of the World Nature is everything in the universe except what humans have manufactured
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A Pattern in Life’s Organization Atoms Fundamental building blocks of all substances Molecules Consisting of two or more atoms Cell The smallest unit of life Organism An individual consisting of one or more cells
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A Pattern in Life’s Organization Population Individuals of the same species in the same area Community Populations of all species in the same area Ecosystem A community and its environment Biosphere All regions of the Earth where organisms live
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Levels of Organization in Nature
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Levels of Organization in Nature
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Fig. 1-2a, p. 4
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Fig. 1-2b, p. 4
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Fig. 1-2c, p. 4
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Fig. 1-2d, p. 4
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Fig. 1-2e, p. 4
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Fig. 1-2f, p. 4
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Fig. 1-2g, p. 5
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Fig. 1-2h, p. 5
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Fig. 1-2i, p. 5
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Fig. 1-2j, p. 5
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Fig. 1-2k, p. 5
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Fig. 1-2 (a-f), p. 4 atom molecule cell tissue organ organ system Stepped Art
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Fig. 1-2 (g-k), p. 5 multicelled organism population community ecosystem biosphere Stepped Art
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Animation: Life’s levels of organization
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Emergent Properties Each level of organization in nature has emergent properties – a characteristic of a system that does not appear in any of its component parts
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1.1 Key Concepts: Levels of Organization We study the world of life at different levels of organization, which extend from atoms and molecules to the biosphere The quality of “life” emerges at the level of cells
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1.2 Overview of Life’s Unity All living things have similar characteristics Continual inputs of energy and the cycling of materials maintain life’s complex organization Organisms sense and respond to change DNA inherited from parents is the basis of growth and reproduction in all organisms
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Energy and Life’s Organization Energy The capacity to do work Nutrients Atoms or molecules essential in growth and survival that an organism cannot make for itself
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Producers and Consumers Producers Acquire energy and raw materials from the environment Make their own food ( photosynthesis ) Consumers Cannot make their own food Get energy by eating producers and other organisms
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Organisms Sense and Respond to Change Organisms sense and respond to change both inside and outside the body by way of receptors Receptor A molecule or cellular structure that responds to a specific form of stimulation
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Responding to Receptors
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Homeostasis Homeostasis Organisms use receptors to help keep conditions in their internal environment within ranges that their cells can tolerate
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This note was uploaded on 04/02/2012 for the course BIO 100 taught by Professor Corbet during the Spring '12 term at Paradise Valley Community College .

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chapter1 - Invitation to Biology Chapter 1 Impacts, Issues:...

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