BIOFINAL1

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Author:
pamichael5350
ID:
123558
Filename:
BIOFINAL1
Updated:
2011-12-14 16:37:11
Tags:
Biology
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Description:
Unit 1
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  1. Name the characteristics of LIFE.
    • cellular
    • energy processing
    • evolutionary adaptation
    • growth and development
    • organized order
    • structure reflects function
    • regulation of internal conditions (homeostasis)
    • reproduction
    • response to the environment
  2. CELLS
    • smallest unit of LIFE
    • life's fundamental unit of structure and function
  3. What is the alternative definition of LIFE?
    Anything that can EVOLVE
  4. EVOLUTION
    change in the allele frequency of a population
  5. GENE
    sequence of DNA that codes for a trait
  6. ALLELE
    form of a particular gene
  7. Evolution by natural selction
    differtential reproductive sucesses among individuals because of environmental influences
  8. 3 requirements for Natural Selection
    • variation among individuals
    • differences in sucess
    • inheritance of important traits
  9. Levels of Biological Organization
    • biosphere
    • ecosystem and community
    • population
    • organism
    • organ system
    • tissue cell
    • organelle
    • molecule
    • atom
  10. Prokaryotes vs Eukaryotes
    lack nuclei and organelles vs have nuclei and membrane bound organells
  11. atom
    sub-atomic particles and their charges
    • smallest unit of matter retaining properties of an element
    • protons: positve
    • electrons: negative
    • neutrons: neutral
  12. molecule
    two or more atoms held together by covalent bonds
  13. compound
    a substance containing two or more different elements combined in a fixed ratio
  14. ion
    a charged atom or molecule
  15. isotope
    • different atomic forms of the same element
    • more neutrons therefore more mass but same charge
  16. ionic vs covalent bonds
    transfer of electrons vs sharing of electrons
  17. non-polar vs polar covalent bonds
    shared equally vs not shared equally
  18. electronegativity
    the attraction of a particular kind of atom for the electrons of a covalent bond
  19. polarity depends on
    the relative electronegativity of the two atoms
  20. hydrogen bonding
    • formed when a hydrogen atom covalently bonded to one electronegative atom is also attracted to another electronegative atom
    • usually nitrogren or oxygen in living cells
    • hold the double helix of DNA together

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