Antr #2

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  1. six key properties of life
    • 1) order
    • 2)Reproduction
    • 3)growth and development
    • 4)Energy Utilization
    • 5) Response to the Environment
    • 6)Evolutionary Adaptation
  2. Order
    • living organisms are highly structured
    • Necessary but not a Sufficient condition
    • (living organisms exhibit order in their internal structure, view of spiral patterns in two single-celled organisms)
  3. Reproduction
    • living organisms reproduce or are products of reproduction
    • (organisms reproduce their own kind.)
  4. Growth and Development
    Living organisms change over the course of thir lives
  5. Energy Utilization
    living organisms use energy to maintain order, reproduce, grow, and develop
  6. response to the environment
    • living organisms all respond in some way to changes in their environment
    • attempt to stay in "homeostasis"
  7. Evolutionary Adaptation
    • living organisms participate in evolution, and reflect the evolutionary history of their ancestors.
    • Heredity: traits passed on to new organisms
  8. Anaximander (c.620-547 BCE)
    Empedocles (c. 492-432 BCE)
    • !)life arose in water
    • Gradually evolved from simpler to more complex forms
    • 2) creatures poorly adapted to their environments would perish
  9. Aristotle (c. 300 BCE)
    • species are fixed and do not change
    • Species are independent of one another
  10. Jean Baptiste Lamarck (early 1800s)
    • life-forms evolve by gradually adapting to perform successful in their environments
    • (EX: Giraffe grows neck over life period, and then pass their characteristics on to their offspring)
  11. Charles Darwin (Early 1800s)
    • Age 22 sailed on 5yr trip around the globe
    • orgin of species(1859)
    • Described obserbation of living organism that suggested evolutionary changes have occured
    • presented a model of how evolution occurs, based on wealth of evidence
  12. Fact 1) overproduction and competition for survival
    any population of species is capable of producing more offspring than the environment can support
  13. Fact 2) Individual variation
    No two individuals are exactly alike some possess traits that make them better at competing for food and resources
  14. conclusion:
    the individuals with the traits best suited to their environment are more likely to survive and reproduce
  15. DNA
    • deoxyribonucleic acid
    • all life on earth relies on DNA
  16. 1)Membrane
    • 1)separates cell from surroundings
    • 2)Different organelles perform a variety of functions
    • 3)Animal cells have a nucleus that provides additional protection for the DNA
  17. Carbon
    • Atoms link together to form molecules via chemical bonds, which involve sharing electrons
    • carbon has 4 electrons and 4 "empty sports" in outermost shell (can form bonds to as many at four atoms at a time)
  18. molecular components of cells
    • 1)Carbohydrates=Carbs(provide energy to cells)
    • 2)lipids=Fats(store energy in cells)
    • 3)proteins= structural elements(composed of long chains of amino acids)(Enzymes:proteins that facilitate biochemical reactions in cells)(handedness (or "chirality" of amino acids in proteins points to common ancestor for all life)(all living things use "left-handed molecules")
    • 4)Nucleic Acids
  19. molecular components of cells
    Nuclecic Acids
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Antr #2
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