Diatoms

Card Set Information

Author:
DesLee26
ID:
261929
Filename:
Diatoms
Updated:
2014-02-15 17:17:09
Tags:
Plant Kingdom
Folders:
Biology
Description:
Mickle
Show Answers:

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  1. Structure
    • Unicellular (majority) or colonial; loosely aggregated into irregular filaments
    •  
    • Cells are pennate (bilateral symmetry) or centric (radial symmetry)
    •  
    • Most prevalent
    •  
    • Storage food is lipids and chrysolaminarin
    •  
    • Forms diatomaceous earth 

    CELLS ARE DIPLOID
  2. Mobility
    • Adults: no
    • Gametes:  yes; they have flagella
  3. Location
    Freshwater, but some marine, free floating or attached to substrate
  4. Life cycles
    • Haplobiontic diploid life cycle
    •  
    • Pennate: isogamous
    • Centric: oogamous
  5. cell wall
    • Cell Wall: made of silica that is hard to break down; two part cell walls fitting together like a petri dish
    • The walls are frustules with pores, depressions, or passageways
    •  
  6. pigments
    • Pigments: chlorophyll a and c
    • fucoxanthin
  7. reproduction
    • Asexual (mitosis): the two halves split, each given to a daughter cell who must regenerate the other half; this causes shrinkage, leading to sexual reproduction if it gets too small, thus getting the size up again
    •  
    • Gametic (oogamous
  8. poisoning/ problems
    • Amnesic shellfish poisoning
    • -          Caused by Pseudo-nitzchia
    • -          Neurotoxin: domoic acid
    • -          Can cause death
    • Chaetoceros
    • -          Has hollow spines that break off and penetrate fish gills, disrupting gas exchange
  9. Uses
    Uses: filters (main use), mineral filler, insulation, insecticide, mild abrasive, paint

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