Jim Bidlack - BIO 1304 I. Purpose of membranes - cellular and organelle A. Continuum of systems - nucleus and endoplasmic reticulum 1. "Flow of metabolites" B. Isolation - mitochondrion cannot fuse with nucleus 2. "Independent recognition sites" C. Passage of metabolites 1. Diffusion - from high concentration to low concentration 2. Osmosis - movement of water through a differentially permeable membrane a) From high concentration to low concentration b) Selectivity - active transport 3. Carrier systems a) Chloroplast 1) H + pumped into thylakoid lumen 2) H + then transported to outer stroma and coupled to make ATP b) Mitochondrion 1) H + pumped out to intermembrane space 2) H + then transported to inner matrix and coupled to make ATP II. How is specific transport accomplished? A. Biological membranes
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