Biol 1108 handout membranes

Biol 1108 handout membranes - From single cells to...

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1 From single cells to multicellular life forms Dr. Kathrin Stanger-Hall Q1: As cell size increases, which of the following does NOT happen? a. SA increases b. V increases c. V increases faster than SA d. SA/V increases Q2: Larger organisms can be made by arranging several cells into a ball True (T) or False (F)?
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2 Surface Area/Volume Ratio sets the limits ! Hollow balls: Colonial Algae Volvox (daughter cells inside hollow ball) Thin Sheets: Brown and Green Algae (Protists) Kelp forests Fields of “see lettuce”
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3 Thin Sheets: Mosses & Liverworts Network of thin cell strands: fungal hyphae Invaginations: Sponges (Porifera) Sponges are the oldest animals
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4 Invaginations: Jellyfish (Cnidaria) Sedentary stage: polyp Invaginations: Colonial Sea Anemones (Corals) Colonial anemones Thin Sheets: Corals
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5 Thin sheets & Invagination: Flatworms Terrestrial flatworm Marine flatworms Too be continued…. In the mean-time… Where do YOU see SA/V ratio in action? Your daily routines and your environment may be more interesting than you think!
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