bio sem 1 valleie

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bio sem 1 valleie
2011-01-17 22:18:16
bio valleie

for semester 1 at rhs
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  1. age structure
    # of males and females each pop contains
  2. demographic transition
    from high b&d rates to low ones
  3. density dependent limiting factors
    act in proportion to how pop has become (competition;,disease,stress,overcrowding)
  4. density independent limiting factors
    affects all pops in similar ways(weather stuff(
  5. exponential growth
    larger a pop gets the faster it grows
  6. logistic growth
    pops growth slows then stops, follows expon. growth
  7. population density
    number of individuals per unit area
  8. aphotic zone
    photosynth. cannot occur
  9. benthos
    aquatics live on,in,or near rocks at the bottom of the ocean
  10. canopy
    dense leafy covering,
  11. climax community
    product of secondary succession in a healthy ecosystem
  12. coniferous
    produce seed bearing cones, and needle shaped leaves
  13. deciduous
    sheds leaves during particular season
  14. ecological succession
    predictable changes that occur over time
  15. estuary
    wetland, where river meets the sea
  16. humus
    material formed from decaying leaves and other orgnaic matter
  17. photic zone
    photosynthesis can occur
  18. primary succession
    no remnants of an older community
  19. secondary succession
    situation where a disturbance affects a community without completely destroying it
  20. taiga
    dense forests of coniferous evergrees, northern edge of temperate zone
  21. understory
    shorter trees and vines form under canopy
  22. wetland
    water either covers soil or is present near the surface
  23. bio
    study of life
  24. biosphere
    living planet
  25. control group
    exposed to the same stuff as the expiremental group except one variable
  26. hypothesis
    scientific explanation for observations that can be tested
  27. independent variable
    variable that is deliberately changed
  28. inference
    logical interpretation based on whates already known
  29. metabolism
    combination of chemical reactions where materials are built and broken down
  30. theory
    well tested explanation that unifies a broad range of observations
  31. active transport
    movement of materials against a concentration diffference
  32. aquaporins
    channels that allow water to pass
  33. cell membrane
    thin flexible barrier
  34. centrioles
    cell division
  35. diffusion
    force behind movement across membrane
  36. ER
    assemble lipids
  37. eukaryotes
    have nucleus
  38. facilitated diffusion
    molecules pass through special protein channels
  39. golgi apparatus
    modifies,sorts,packages proteins from er for storage in cell or release
  40. hypertonic
    shrinks,above strength
  41. hypotonic
    bursts, water solution is more than sugar
  42. isotonic
    stays normal size, water and sugar are same strength
  43. lipid bilayer
    regulates what enters and leaves the cell
  44. lysosomes
    brekdown lipids, carbohydrates and proteins into more convienent molecules
  45. mitochondria
    converts chemical energy from food
  46. nucleus
  47. organ
    grop of tissues
  48. osmosis
    diffusion of water through selectively permeable
  49. osmotic pressure
    force that results from movement of water in&out of the cell
  50. passive transport
    does not require energy
  51. prokaryotes
    no nucleus
  52. receptor
    detects a single molecule and performs an action in response
  53. ribosomes
    assemble proteins, rna
  54. tissue
    group of similar cells
  55. biodiversity
    varied geneticity of all organisms
  56. biological magnification
    ddt,mercury,or pcb is picked up and not broken down
  57. ecological footprint
    describes total usage of resources a population needs
  58. ecological hotspot
    place where # of species and habitats are in daner of extinction
  59. ecosystem diversity
    variety of habitats,communities, and ecological processes in a biosphere
  60. genteic diversity
    total of dif genetic info. in a species
  61. ozone layer
    contains nitrogen
  62. sustainable development
    provides needs while preserving resources
  63. abiotic
  64. biogeochemical cycles
    closed loops that elements pass through from 1 organism to another
  65. biomass
    amount of living tissue in a trophic level
  66. biotic
  67. chemosynthesis
    chemical energy is used to produce carbohydrates
  68. dentrification
    nitrates converted to nitrogen gas
  69. detritivores
    feed on detritus particles
  70. ecological pyramid
    shows amount of energy or matter within each level in a given chain or web
  71. ecology
    study of interactions
  72. food chain
    steps where energy is transferred by eating and being eaten
  73. nitrogen fixation
    nitrogn gas into ammonia
  74. phytoplankton
    floating algae
  75. pyramid of biomass
    living organic matter in each level
  76. pyramid of numbers
    # of individual organisms at each level
  77. scavengers
    consume carcasses of others
  78. zooplankton
    small , swimming animals that feed on marine algae
  79. acid
    forms H+ ions in solution
  80. activation energy
    starts chemical reaction
  81. adhesion
    attracion between molecules of different sybstances
  82. amino acids
    compounds with amino group on one end and carboxyl group on the other
  83. base
    produce hydroxide ions
  84. buffers
    weak acid or base that react with stronger to prevent sharp changes in pH
  85. carbohydrates
    carbon hydrogen and oxygen 1:2:1
  86. catalyst
    speed up chemical reactions
  87. cohesion
    attraction of molecues that are the same substance
  88. double covalent bond
    atoms share 4 electrons
  89. electron
    negativley charged particle
  90. enzymes
    proteins that act as a catalyst
  91. hydrogen bond
    attraction between hyrdrogen atom with one positive and one negative harged atom
  92. ions
    positive and negative charged particles
  93. isotopes
    atoms of the same element that differ in # of neutrons
  94. lipids
    not soluable in water
  95. mass #
    total # of protons and neutrons in the nucleus
  96. molecules
    smallest unit of most compounds
  97. monomers
    single part
  98. monosaccharides
    single sugar molecule
  99. neutron
    noncharged particle
  100. nucleic acids
    macromolecules thatcontain hydrogen oxygen nitrogen carbon and phosphorous
  101. nucleotides
    3 parts, 5 carbon sugar,phosphate group, nitogeneous base
  102. peptide bonds
    link amino acids, form polypeptide
  103. proton
    positively charged particle
  104. reactants
    elements that enter a chem reaction
  105. saturated
    fatty acids, contain max hydrogen
  106. single covalent bond
    share 2 electrons
  107. solution
    mixture of ions dispersed in water
  108. solvent
    substane in which solute dissolves
  109. substrates
    reactants of an enzyme catalyzed reaction
  110. suspension
    water and non dissolved material
  111. van der waals forces
    when molecules close, slight attraction can develop between opposite charged regions
  112. organic groups
  113. nucleic acid
    nucleotides, pass genteic info CHONP
  114. protein
    CHON amino acids repair inside body
  115. lipids
  116. carbohydrates
    CHO (monosaccharides) energy
  117. cfc
    thinning of ozone layer
  118. montreal protocal
    in canada all nations agreed to reduce cfc
  119. greenhouse gases
    methane, carbon dioxide, water
  120. water cycle
  121. carbon cycle
  122. nitorgen cycle
    protein build up, nitrogen fixation
  123. phophorous cycle
    rain resolves rocks, releas water into plants &absorbes