1. Exploring Life

1. Exploring Life - 1 Exploring Life Table of Contents...

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1. Exploring Life 14/01/2008 11:11:00 Table of Contents 1.1- Biologists Explore Life from the Microscopic to the Global Scale 1.2- Biological Systems are much more than the Sum of their Parts 1.3- Biologists Explore Life across its Great Diversity of Species 1.4 1.5
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1.1- Biologists Explore Life from the Microscopic to the  Global Scale 14/01/2008 11:11:00 Overview The study of life extends from the microscopic scale of molecules and cells  that make up organisms to the global scale of the entire living planet o Levels of biological organization= divisions of the range Hierarchy of Biological Organization Biosphere o All the environments on Earth that are inhabited by life Ecosystems o All the living things in a particular area o All the nonliving things with which life interacts Communities o All living things (organisms) in a particular ecosystem Populations o All the individuals of a species in a specified area Organisms o Individual living things o Organ- body part consisting of two or more tissues o Organ system- team or organs that cooperate in a specific function o Major organs of plants Leaves, stems, roots
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Tissues o A group of similar cells Cells o Fundamental unit of structure and function of life Organelles o Various functional components that make up cells Molecules o Chemical structures consisting of two or more atoms A Closer Look at Ecosystems Each organism interacts continuously with its environment o o Both organism and environment are affected by the interactions  between them Ecosystem Dynamics o Dynamics of any ecosystem include two major processes Cycling of nutrients Ex: minerals acquired by plants will eventually be  returned to the soil via microorganisms that decompose  organic debris Flow of energy from sunlight to producers to consumers Producers= photosynthetic organisms that convert light  energy to chemical energy Autotrophs
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Ex: plants Consumers= organisms that feed on producers and other  consumers Heterotrophs Ex: heterotrophs Energy Conversion o Activities of life require work Work depends on a source of energy o The exchange of energy between an organism and its surroundings  often involves the transformation of one form of energy to another In energy conversion Some energy is converted to thermal energy Thermal energy is dissipated as heat o Chemical nutrients Recycle within an ecosystem o Energy Flows through an ecosystem
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This note was uploaded on 04/29/2008 for the course BISC 220L taught by Professor Herrera,mcclure during the Spring '07 term at USC.

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1. Exploring Life - 1 Exploring Life Table of Contents...

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