week 6 - protists --> Stramenopiles

Question 1

STRAMENOPILES

Answer 1

• Grouped based on ‘hairy’ flagella
• Both chemoorganotrophs and phototrophs
• Micro and macro

Question 2

STRAMENOPILES
major groups

Answer 2

o Brown algae (multicellular)
o Golden algae
o Diatoms (silica cell wall)
o oomycetes

Question 3

STRAMENOPILES
diatoms

Answer 3

• Range in size 5-200 microns
• Unicellular and phototrophic
• Phytoplankton of marine and fresh water
• Important part of marine food web
• Silica cell wall
  o Incredibly well preserved
   Which is why some of the best microbial fossils are diatoms
   Often symmetrical structure
• Cell wall structure shape called a frustule
  o This is what we see as a fossil
• Some of the best Eukaryotic microbial fossils
• Used in studies of change in environment
  o E.g. water pollution