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Biology : The Study Of Life Notes 1-1

Biology : The Study Of Life Notes 1-1. Biologists have devised a list of 7 characteristics that define life. Something can be considered alive ONLY if it displays ALL 7 of the characteristics. Anything that possesses all 7 of the characteristics of life is called an organism.

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Biology : The Study Of Life Notes 1-1

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  1. Biology:The Study Of LifeNotes 1-1

  2. Biologists have devised a list of 7 characteristics that define life. • Something can be considered alive ONLY if it displays ALL 7 of the characteristics. • Anything that possesses all 7 of the characteristics of life is called an organism. The Characteristics of Life

  3. 1. Display cellular organization: • Cell = the basic unit of structure and function in all living things. • Smallest unit that can perform all life’s • processes. • Living things are made of one cell (unicellular) or many cells (multicellular). The Characteristics of Life

  4. The Characteristics of Life • For complex multicelluar organisms, cells specialize. • Levels of Organization: -Cells form tissues -Tissues form organs -Organs form organ systems

  5. The Characteristics of Life 2. Respond to Stimuli They are able to react, or respond to an environmental condition, or stimulus. Venusflytrap

  6. 3. Maintains Homeostasis: The Characteristics of Life • All organisms are able to maintain a relatively constant internal environment. • Homeostasis: The regulation of an organism’s internal environment to maintain conditions suitable for life. • Example – maintaining a constant body temperature – sweating

  7. The Characteristics of Life 4. Metabolism • Organisms require energy to perform life processes such as repair, movement, or growth. • Metabolism = the sum of all the chemical reactions that take in an transform energy and materials from the environment. • Some organisms use light energy from the sun to make their own food and fuel their activities; while, other organisms that cannot make their own food get energy by consuming other organisms.

  8. 5. Grow and Develop: • All living organisms grow and develop during their life spans. • Growth: an increase in the size of an organism due to an increase in the size and number of cells • Development: all of the changes that take place throughout the life span of an organism The Characteristics of Life

  9. 6. Reproduction: • All organisms produce offspring like themselves. • Although reproduction is not essential to the survival or an individual organism, it is essential for the continuation of a species. The Characteristics of Life

  10. All living organisms contain genetic information that can be passed on through generations. • Heredity information is transmitted through a molecule called DNA. • Gene = segment of DNA that contains instructions for a specific trait. The Characteristics of Life

  11. The Characteristics of Life 7. Evolve Over Time • Although individual organisms change during their lifetime, their genetic characteristics do not. • However, populations of living things do change over time (evolve). • Ability to evolve is essential for survival in a changing world.

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