Groups of algae (from eukaryotes ch)

Question 1

Brown algae

Answer 1

• Kelp, seaweed (macro)
• Found in coastal waters
• Has air bladders: fill with air and allow for buoyancy when sun is out for photosynthesis
• Looks like grapes
• Industrial uses:
  seaweed for food
• Chemicals:
  Algin: thickening agent for stuff like lotion, ice cream, and tires
  Laminaria japonica → used to induce vaginal dilation (sx treatments into uterus from vagina)

Question 2

Red algae

Answer 2

• Live at greatest ocean depths (cannot effectively synthesize)
• Carentoids → red color in red algae and red leaves
• Industrial uses: Agar
  Carrageenan: used as a clarifying agent in items like shampoos
  Dry bits: irish moss

Question 3

Spirogyra (Green algae)

Answer 3

• Evolutionary precursor to terrestrial plants but they lack tissue differentiation
• Aquatic
• Pond scum
• Volvox: colonial organism –> cells are permanently stuck together in 1 group

Question 4

Diatoms

Answer 4

• Silica cell wall with pectin
• Unicellular but have silica cell wall
• Dead diatoms → convert to petroleum

Question 5

Dinoflagellate

Answer 5

• Free-floating organisms (plankton, cannot move under their own power)
• Plankton types: zooplankton (animal, SpongeBob), Phytoplankton (plant)
• Bioluminescence
• Red tide and paralytic shellfish poisoning

Question 6

Oomycota aka water mold

Answer 6

• The main decomposers in aquatic environments
• Water molds are found as white, cotton masses on dead freshwater organisms
• Irish Potato Famine