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BI110 (469)
Lecture 16

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Matthew Smith

 Clicker question answers o Which of the following provides the energy for the transport of molecules across biological membranes?  ATP, concentration gradients, and nucleotide-activated sugars (UDP-glucose) o Alternative oxidase isn't present in:  Archaea o Rhodopsin has an integral membrane protein  Transmembrane Proteins o Nonpolar Aas are hydrophobic o Tend to be in TM portion  Peripheral Membrane Proteins o On surface of membrane o Don't interact w/ hydrophobic core o Associate w/ membrane surface through noncovalent bonds (ionic and hydrogen bonds) o Most on cytoplasmic side of membrane o Made up of mixture of polar and nonpolar amino acids  Passive Membrane Transport o Hydrophobic nature of membranes restricts free movement of many molecules and substances essential for life o Passive Transport: movement of substance across membrane w/o need to expend chemical energy such as ATP  Passive Transport and Diffusion o Passive transport driven by diffusion o Diffusion: net movement of substance from region of higher to lower concentration o Primary mechanis
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