BIOL 1108 Lecture Notes - Lecture 8: Multicellular Organism, Cell Adhesion, Photosynthesis
Document Summary
Biol 1108 - lecture 8 - ch. 28 & 8: multicellularity & photosynthesis. Four key points of multicellularity in organisms other, no matter the number that is in the organism. Complex multicellular organisms have cells that work in close coordination with each. Most prokaryotic organisms are single cells but some form filaments or live in colonies. No bacteria is multicellular, but they developed macroscopic bodies with functionally different tissues. Increased surface area increases exposure to environment therefore exchanges of. Some drawbacks with large surface area nutrients. More contact with environment leads to loss of water and dissolved substances. Also problems with temperature control in unfavorable environments. Six groups have this in a few species. Nuclei divide multiple times but do not partition into individual cells. A small subset of cells contribute to reproduction. Presence of both interior and exterior cells. Bulk flow circumvents limits of diffusion in complex multicellularity.
