NOTES-Chapter 8

NOTES-Chapter 8 - Chapter 8: Cell-Cell Interactions...

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Chapter 8: Cell-Cell Interactions Unicellular and Multicellular Organisms Unicellular-bacteria, protozoan’s (amoeba and paramecium), simple algae, and simple fungi-on their own for their most part and rarely communicate with each other except for sex sometimes. Surrounding environment is usually water with ions, nutrients, temperature , pH, and other organisms Multicellular-communicate with the physical environment and cells communicate with each other. Have evolved multiple times independently so we assume it to be advantageous. Red algae, green algae, brown algae, fungi, slime molds, higher plants, animals Most cells have an extracellular matrix- made up of fibers or filaments in a ground substance Cell Wall Fiber composition-cellulose matrix composition-pectin (lots in fruits)-gelatinous polysaccharide crosslink’s-connect cellulose fibers secondary cell walls contain lignin-extremely strong Animal Cells fiber composition of proteins like collagen and elastin matrix is composed of polysaccharides the ecm connects to the cytoskeleton of the cell. Integrin proteins pass through he plasma membrane to connect to actin filaments Connections between PLANT cells
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NOTES-Chapter 8 - Chapter 8: Cell-Cell Interactions...

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