Intro Bio Notes 2010
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Intro Bio Notes 2010

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    Intro Bio Notes 2010 Intro Bio Notes 2010 Presentation Transcript

    • BIOLOGY THE STUDY OF LIFE
    • Eight Characteristics of Life
      • H omeostasis
      • E nergy Use
      • R eproduction
      • C ells
      • A daptations
      • R esponse to Stimuli
      • G rowth & Development
      • O rganized
      Pneumonic Device: Great Aunt Rose Only Ever Cooks Rare Hamburgers
    • Organisms:
      • Organisms must have all eight characteristics in order to be considered alive
      • An organism is something that is currently living
      • Ranges from: Bacteria (20 nm) to Armillaria ostoyae (10 km)
      To
    • Homeostasis
      • Homeostasis- Stable internal condition
      • Examples:
          • Heart rate
          • Body temperature
          • ph levels
          • water levels
          • Others:
      • Organisms must be able to maintain homeostasis in order to survive
    • Energy Use
      • Autotrophic
        • Organisms that make their own food that they will then convert to energy
        • Examples:
        • Photosynthesis:
      • Heterotrophic
        • Organisms that must take in food from an outside source
        • Examples
      Organisms obtain energy by one of two methods:
    • Responding to stimuli
      • Organisms respond to a stimuli in order to maintain homeostasis
      • Senses : Making observations which lead to responses
      • Reflexes : Unconscious responses to stimuli
          • Blinking
    • Responding to stimuli
      • Behaviors : Learned and instinctive responses to stimuli
        • Migration
        • Hibernation
        • Putting a coat on when it is cold
    • Cells
      • Cells – basic units of structure and function for all living things
      • All organisms are made of one or more
    • Unicellular vs Multicellular
      • Unicellular - Composed of just one cell . Must carry out all of life's functions. 
      • Multicellular- C onsist of more than one cell. H ave differentiated cells that perform specialized functions. Individual cells cannot survive on their own.
    • Adaptations
      • In order for an organism to survive it must be able to adapt in response to the environment it is in.
      • Adaptations – changes made by an organism in response to the environment in order to survive.
      • Examples :
      • Evolution: change within a population of a certain species of organisms over a long period of time
    • Reproduction
      • Asexual
        • One parent
        • Each organism is genetically identical
        • “ Fast and easy”
        • Budding & fission
      • Sexual
        • Requires two parents
        • Organisms genetically different
        • “ Slow and hard”
        • Sex cells from each gender join
      • Reproduction- process by which organisms produce offspring
    • Growth & Development
      • Two ways an organism can grow in a multicellular organism:
        • Cell enlargement – each cell gets bigger (exp: muscle and fat cells)
        • Cell division (reproduction)- cells reproduce producing more cells
      • Development: Occurs when an organism, cells, or body tissues gain the ability to perform a certain task
        • Occurs by:
          • Cell Division
          • Cell Specialization: Each cell becomes different to perform its task
    • Organized Molecules Cell Parts Cells Tissues Organs Organ system Organism Cellular Level – All organisms are at least organized to this level