chapter 7 quiz 2 1-22

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chapter 7 quiz 2 1-22
2012-03-17 13:55:53
chapter quiz 22

chapter 7 quiz 2 1-22
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  1. nutients
    are chemical substances that are acquired from the enviroment and used in cellular activities

    are processed and transformedd into chemicals aftter absorption
  2. Essential nutrients
    substances that must be provided to the organism
  3. macro-nutrients
    required in large quanties

    example carbon, hydrogen, oxygen
  4. micro-nutrients
    trace elements present in smaller amounts
  5. inorganic nutrients
    combination of atoms other then carbon and hydrogen

    examples sodium,iron,magnesium
  6. organic nutrients
    contain carbon, hydrogen and present in all living things
  7. source of essential nutrients

    • carbon
    • hydrogen
    • oxygen
    • nitrogen
    • phosphorus
    • sulfur
  8. how is carbon obtained
    heterotrophs-must obtain carbon in organic form from protien, lipids,carbs

    autotrophs- self feeders uses inorganic carbon as its CO2 source
  9. how energy is obtained
    phototrophs- microbes that photosynthesize energy from sunlight

    chemotrophs- microbes that get energy from chemical compounds
  10. chemohetertrophs
    derive from carbon and energy from organic compunds

    has 2 types saprobes and parasites
  11. saprobes
    • free living
    • feed on organic dead oragnisms
    • decomposers
    • include fungi and bacteria
  12. parasites
    • derive nutrients from the cell or tissue of a host
    • cause damage to the host
    • also known as pathogen
    • cause diease
  13. ectoparsite
    live in the body
  14. endoparasites
    live in oragns and tissues
  15. intracellular parasites
    live within cells
  16. obligate parasites
    are unable to grow outside of a living host
  17. where is nutirents transported?
    across cell membrane
  18. types of transports
    • passive-osmosid, diffusion require no energy
    • active - endocytosis phagocytosis require eneggy
  19. osmosis
    diffusion of water through a selectivley permiable membrane from area of high concentration to area of low
  20. isotonic
    • eqaul solutencentration
    • no net change
    • stable
  21. hypotonic
    solute concentration of external enviroment is lower then that of the internal enviroment

    net direction is from hypotonic solution into the cell

    cells w/o cell walls swell and burst known as lysis
  22. hypertonic
    • higher solute concentraction then the cytoplasm
    • will focre watter to diffuse out of the cell
    • high osmotic pressure