Origin and Classification of Life

Origin and Classification of Life - A view of life; Origin...

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A view of life; Origin and Classification of Life Biol 120 Dr Ariyibi Register online at www.masteringbio.com Course Title: Organismic Biol 120 Course ID: DRARIYIBI41122 Outline Defining Life - Emergent Properties Materials and Energy Reproduction and Development Adaptations and Natural Selection Biosphere Organization Human Population Biodiversity Taxonomy Scientific Method Defining Life All living things are comprised of the same chemical elements and obey the same physical and chemical laws as nonliving objects. A cell is the smallest, most basic unit of life. Tissue, Organs, Organ Systems, Organism Population, Community, Ecosystem, Biosphere Defining Life Emergent Properties Each level of organization is more complex and has properties beyond the preceding level.
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Each new level of organization has emergent properties due to interactions between different parts of the whole . Materials and Energy Energy is the capacity to do work. Metabolism encompasses all the chemical reactions that occur in a cell. Homeostasis - Maintenance of internal conditions within certain boundaries. The sun is the ultimate source of energy for nearly all life on the planet. Photosynthesis Reproduction and Development Asexual Reproduction: Unicellular organisms Sexual Reproduction: In most multicellular organisms, reproduction begins with the union of two gametes from different individuals. Organizational instructions encoded in genes . Composed of DNA Adaptations Adaptation - Any modification that makes an organism suited to its way of life. Over time, organisms become modified by the process of natural selection . The unity of characteristics between different types of organisms suggests that all living things are descended from a common ancestor. Descent with modification Biosphere Organization All members of a species within a particular area are known as a population . A collection of interacting populations is known as a community . A collection of communities make up an ecosystem . Ecosystems are characterized by chemical cycling and energy flow, both originating from photosynthesis. Human Population The human population tends to modify existing ecosystems for its own purpose.
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Human beings depend on healthy ecosystems for food, oxygen, medicines , other raw materials, as well as the benefits of various ecosystem processes. Biodiversity Biodiversity is the total number of species , the variability of their genes , and the ecosystems in which they live.
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This note was uploaded on 03/29/2010 for the course BIOL Bio 120 taught by Professor Dr.arriyibi during the Spring '10 term at Tuskegee.

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Origin and Classification of Life - A view of life; Origin...

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