CSCI 1006 Lecture Notes - Lecture 5: Lipid Bilayer, Plastid, Mitochondrion
21 Sep 2016
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Document Summary
Mitochondria is the power house of the cell. The cell membrane regulates what enters and leaves the cell and also provides protection and support. Lipid bilayer: core of nearly all cell membranes. Every cell includes a liquid interior and is surrounded by liquid. Cell membrane regulates movement of molecules from one side of the membrane to the other. Concentration: mass of solute in a given volume of solution, mass/volume. Diffusion: molecules tend to move from an area of high concentration to an area of low concentration. Diffusion causes many substances to move across a cell membrane but does not require the cell to use energy. If a substance is able to diffuse across a membrane, the membrane is permeable to that substance. Most biological membranes are selectively permeable: some substances can pass across them while others can"t. Osmosis: process allowing water molecules to pass easily through most biological membranes.
