BIOL 115 Lecture Notes - Lecture 4: Amphiphile, Glycerol, Hydrophile

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31 Jan 2016
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Phospholipids are amphiphilic (a hydrophilic head group and two hydrophobic fatty acid tails attached to glycerol) Unsaturated fatty fats cannot be put as closely together because they have double kinks in fatty acid tails, that is why butter is solid at room temp but oil isn"t (one is unsaturated the other is saturated) Membranes: semi permeable, water goes through fully, ions don"t at all and large molecules barely do. The passing of different substances across the membrane resulting in a mixture of substances in net transport along the concentration gradient. Ex: a rose in a room, the closer you step to it, the stronger the smell is because its particles are mixed with the air particles. Diffusion happens as long as there is a concentration gradient. High temp, small molecules, short distances all speed up the process of diffusion. Osmosis is the diffusion of water across membranes.

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