Characteristics of Life New

Characteristics of Life New - Characteristics of Life 1...

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Characteristics of Life 1. Complex Structural Organization Living things are highly ordered. While living organisms and nonliving matter are composed of the same basic matter (i.e. the same basic atoms), the molecules (arrangement of atoms) that make up living organisms are much more highly organized. In addition, the molecules in living organisms are organized into complex arrangements called organelles, and organelles are organized into complex arrangements called cells. These levels of organization, and others, are outlined below: a. Subatomic particles g. Organs b. Atoms h. Organ systems c. Molecules i. Individuals (multicellular organisms) d. Organelles j. Populations e. Cells (basic unit of life) k. Communities f. Tissues l. Ecosystem 2. Homeostasis You are alive because the cells that make you up are alive. While cells are amazingly complex, they are also amazingly vulnerable to environmental changes. For example, small changes in temperature, or the concentration of water and salts, or the levels of acids or bases (pH) can be lethal. Because external environments change organisms must regulate their internal environments so that cells are exposed to a fairly constant environment. For example, even though air temperatures around you fluctuate your cells experience a fairly constant temperature
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This note was uploaded on 06/28/2009 for the course BIOL 70104 taught by Professor Jamesgilardi during the Fall '08 term at Palomar.

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Characteristics of Life New - Characteristics of Life 1...

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