Cells - Biology 111 Principles of Biology Lecture Outlines...

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Biology 111, Principles of Biology Lecture Outlines Cells & Organelles All Living things are composed of cells. The fluid that fills the interior of cells is known as the CYTOPLASM. Two general classes of cells: Prokaryotic: lack internal membrane-bound organelles generally small and structurally simple Eukaryotic: have internal membrane-bound organelles generally larger than prokaryotic cells and structurally more complex Structure of a typical prokaryotic cell (see Figure 6.6): ORGANELLES (structures with specialized functions): Plasma (Cell) Membrane: cell boundary, regulates transport of materials into and out of the cell Nucleoid: bacterial chromosome (DNA) Ribosomes: site of protein synthesis Cell Wall: provides structure & support Flagella: used for cell motility (movement) Structure of a typical animal (eukaryotic) cell (see Figure 6.9): Organelles (note that most are bound by a membrane): Nucleus: genetic control center, contains chromosomes (DNA). Surrounded by a double membrane (nuclear membrane).
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