Biology 1002B Lecture Notes - Lecture 7: Cholera, Ectotherm, Active Transport

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Membranes are not all lipid, some are more than 50% protein. Lipids have both hydrophobic and hydrophilic groups in same molecule: amphipathic: hydrophobic have both hydrophilic properties, ex. detergents. Internal fatty acids= hydrophobic: hydrophobic affect is spontaneous reaction where fatty acid tails groups together in an aqueous environment. Saturated fatty acids= linear, can"t add more h: butter, margarine, lard. Unsaturated= kink, double bond, double bond: fewer than max # h possible, trans unsaturated: h are across from each other. Banned, unhealthy, acts like saturated fats: cis unsaturated: kinkier h on same side. Molecules very diverse: can by varying length, vary in number of bonds, types, and position. Fluidity of membrane: affected by structure, affected by saturated fat level (more saturated temperature (high temp= low fluidity) fat= less fluid) Keeping membrane at right fluidity is vital (for transport of molecules thru it) within a certain range: to make room for molecules to go thru. Ectotherm: body environment controlled by environmental temperature.

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