bio_101_lecture_ch4-cells - BIO 101 Chapters 4 Cells

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Unformatted text preview: BIO 101 Chapters 4 Cells http://www.cellsalive.com/howbig.htm Cell Theory All living things are made of cells. Cells are the basic units of structure and function in all living things. All cells come from the reproduction of existing cells. Parts of all cells Plasma membrane DNA (nucleoid, nucleus) Cytoplasm (with ribosomes) hydrophilic head (phosphate) hydrophobic tail (lipid) lipid bilayer cytoplasm extracellular fluid CELL OR PLASMA MEMBRANES phospholipid bilayers surround cell & many organelles Cell Size: Surface Area:Volume Cells are limited in how large they can be. This is because the surface area and volume ratio does not stay the same as their size increases. Because of this, it is harder for a large cell to pass materials in and out of the membrane, and to move materials through the cell. Robert Hooke the originator of the word 'cell' in biology 1665 Fig. 4-28b,c, p.70 Insert 4-28b,c Fig. 4-28b,c, p.70Fig....
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bio_101_lecture_ch4-cells - BIO 101 Chapters 4 Cells

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