MBB 231 Lecture Notes - Lecture 8: Pearson Education, Carbonic Anhydrase, Membrane Transport Protein
12 Feb 2016
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They need specialized membrane transport protein to transfer these molecules across the membrane. Diffusion rate across a phospholipid bilayer depends on its: concentration, hydrophobicity, size. Partition coefficient=eq constant for substance dispersion of water and oil. Alternates between two conformations as it transfers small water soluble molecules across the bilayer (selection based on binding specificity of ions and molecules: channel protein. Forms water filled pore through which specific inorganic ions or small molecules can diffuse (selection based on size and charge of ions and molecules) Membrane carrier (transport) proteins are: i. ii. iii. Passive and active transport occurs via membrane transport proteins. Spontaneous movement down a concentration gradient: passive transport/ facilitated diffusion. This definition only applies to uncharged molecules- because charge is a factor. Electrical forces can drive passive transport membrane= membrane potential. There is a difference in electrical potential in each side of the. Negative charges of the cytoplasmic side draws positive charge in.
