BIOB34H3 Chapter Notes - Chapter 2: Peripheral Membrane Protein, Lipid Bilayer, Intestinal Epithelium

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31 Aug 2016
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Chapter 2: molecules and cells in animal physiology part 1. Each animal cell is enclosed in a cell membrane, which also include different types of intercellular membranes. Membranes are dynamic systems that participate in cellular and subcellular functions. Cell membranes are composed of a phospholipid bilayer. Polar molecule: electrons unevenly distributed; non-polar molecule: electrons evenly distributed. Phospholipids contain phosphate groups, which are amphipathic each molecule consisting of a polar part and a nonpolar part. The polar part is hydrophilic and the non- polar part is hydrophobic. The phospholipids are fluid, meaning that individual molecules move about relatively freely by diffusion within each membrane leaflet. Animals exhibit adaptive trends in the phospholipid compositions of their cell membranes. Cells that function routinely at low temperatures tend to have a phospholipid composition that permits membranes to remain fluid under cold conditions (e. g. , they have high proportions of double bonds in the hydrocarbon tails).

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