BLG 143 Chapter Notes - Chapter 6: Membrane Protein, Amphiphile, Electronegativity

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Chapter 6: lipids, membranes, and the first cells: the plasma membrane or cell membrane separates life from nonlife, the plas(cid:373)a (cid:373)e(cid:373)(cid:271)ra(cid:374)e separates the (cid:272)ell"s i(cid:374)terior fro(cid:373) the e(cid:454)ter(cid:374)al e(cid:374)(cid:448)iro(cid:374)(cid:373)e(cid:374)t. Membranes function to: keep damaging materials out of the cell, allow entry of materials needed by the cell, facilitate the chemical reactions necessary for life. Isoprene and fatty acids are key building blocks of lipids. 6. 1 three types of lipids found in cells. Steroids lipids with a distinctive four-ring structure: the(cid:455) differ (cid:271)(cid:455) the (cid:862)r-groups(cid:863) (cid:272)o(cid:374)(cid:374)e(cid:272)t to the rings, cholesterol is an important steroid in mammals. Phospholipids consist of a glycerol linked to a phosphate group (po4 isoprene (in archae) or two fatty acids (in eukarya). 2 ) and two chains of: the phosphate group is polar or charged, phospholipids are important components of the plasma membrane. 6. 1 the structure of membrane lipids: not all lipids can form membranes.

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