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Its Alive – or is it?. The Characteristics of Life. I can…. Describe the biological criteria that need to be met in order for an organism to be considered alive. 6 Characteristics of Life.

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its alive or is it

Its Alive – or is it?

The Characteristics of Life

i can
I can…
  • Describe the biological criteria that need to be met in order for an organism to be considered alive
6 characteristics of life
6 Characteristics of Life
  • In order for ANY organism, no matter how large or small, to be considered alive, it must exhibit the following 5 characteristics:
  • Organization
  • Ability to acquire materials and energy
  • Ability to maintain homeostasis
  • Ability to respond
  • Ability to reproduce and grow
  • Acquire adaptations
organization within a living organism
Organization within a living organism…
  • Organization of living things begins with atoms, which make up basic building blocks called elements and molecules
  • The cell is made up of molecules and is the basic structural and functional unit of all living things
  • Different cells combine to make up tissues
  • Tissues combine to make up an organ
  • Specific organs work together as an organ system
  • Multicellular organisms contain organ systems
  • Each level of organization is more complex that the level preceding
working with what we have learned
Working with what we have learned…
  • Make flow chart of the levels of organization – within an organism
  • At each level, give at least 2 examples
organization between living organisms
Organization between living organisms…
  • A species is the same type of organism
  • A population is group of the same species in a particular area
  • Interacting populations in a particular area is a community
  • A community PLUS its physical (non-living) environment is an ecosystem
  • The biosphere is comprised of regions of the Earth’s crust, waters and atmosphere inhabited by organisms
working with what we have learned1
Working with what we have learned…
  • Using our classroom as our “particular area”, give examples for each level of organization found between organisms
acquire materials and energy
Acquire Materials and Energy
  • Maintaining organization and conducting life-sustaining processes require an outside source of energy
    • The ultimate source of energy for nearly all live on earth is the sum
    • Plants and certain other organisms convert solar energy into chemical energy by the process of photosynthesis
  • Metabolism is all the chemical reactions that occur in the cell
ability to maintain homeostasis
Ability to maintain homeostasis…
  • All organisms must maintain a state of biological balance, or homeostasis
    • Temperature, moisture level, pH level, etc.. Must be maintained within the tolerance range of the organism
  • Organisms have intricate feedback and control mechanisms to maintain homeostatic balance
ability to respond
Ability to Respond…
  • Living things interact with the environment and with other living things and need to respond accordingly
  • Response often results in movement of the organism
    • A plant bending toward the sun to capture solar energy or a turtle withdrawing into its shell for safety
  • Responses help ensure survival of the organism and allow the organism to carry out biological activities
  • The collective responses of an organism constitute the behavior of the organism
ability to reproduce and grow
Ability to reproduce and grow…
  • Reproduction is the ability of every type of organism to give rise to another organism like itself
    • Bacteria, protozoans, and other unicellular organisms simply split in two (binary fission) – asexual reproduction
    • Multicellular organism often unite sperm and egg, each from a different individual, resulting in an immature individual which develops into the adult – sexual reproduction
  • The instructions for an organism’s organization and development are encoded in genes
    • Genes are comprised of long molecules of DNA (Deoxyribonucleic acid)
    • DNA is the genetic code for all living things
acquire to adaptations
Acquire to Adaptations…
  • Adaptations are modifications that make organisms suited to their way of life
  • Occur over a long period of time
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