Characteristics Of Life
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Transcript

  • 1. What Does it Mean to Be Alive? The Characteristics of Life
  • 2. Life!!! All living things share some basic properties.
    • Cellular Organization
    • Reproduction
    • Metabolism (Obtain and Use Energy)
    • Homeostasis
    • Heredity
    • Responsiveness
    • Growth and Development
    • Adapt Through Evolution
  • 3. All Living Things are Made Up of Cells Unicellular Organisms
    • Entire organism is made up of one single cell
    • Bacteria and protists
    Smallest unit capable of all life functions
  • 4. Multicellular Organisms
    • The organism is made up of many cells
    • Cells have specialized functions within the organism
  • 5. All Living Things Reproduce Reproduction is the process of producing new organisms of the same type Asexual Reproduction
    • A single parent organism reproducing by itself
  • 6. Sexual Reproduction
    • Two different parent organisms contribute genetic information
    • Involves the combination of male and female sex cells
  • 7. All Living Things Obtain and Use Energy Living organisms need energy to grow, develop, repair damage, and reproduce
  • 8. Anabolism The process of building up complex substances from simpler substances
    • Building up cells and cellular components
    • Photosynthesis
  • 9. Catabolism The process of breaking down complex substances into simpler substances to release energy
    • Digestion
    • Cellular Respiration
  • 10. Metabolism The total of all chemical reactions in an organism
    • Anabolism + Catabolism = Metabolism
  • 11. A stable state of conditions in the body that are necessary for life
    • Body temperature
    • Blood volume
    • pH balance
    • Water balance
    All Organisms Maintain Homeostasis
  • 12. All Organisms Pass Along Hereditary Traits Genes carry hereditary information Genes are composed of DNA Heredity is the reason children resemble their parents Mutations change DNA code and can be passed from generation to generation
  • 13. All Living Things Respond to Their Environment
    • Organisms react to stimuli:
    • Light
    • Temperature
    • Odor
    • Sound
    • Gravity
    • Heat
    • Water
    • Pressure
    An example is a plant’s leaves and stems growing toward light
  • 14. All Living Things Grow Growth means to get bigger in size
  • 15. All Living Things Develop Development involves a change in the physical form or physiological make-up of an organism
  • 16. All Living Things Adapt to Their Environment Through Evolution Adaptation
    • A process that enables organisms to become better suited to their environment
    • Species obtain adaptations through evolution over great periods of time
  • 17. An Example of Adaptation Desert plants have succulent waxy leaves and stems to store water and reduce water loss