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150 091 Lecture 1

150 091 Lecture 1 - Commentaries on BISC 150 Lectures I...

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Commentaries on BISC 150 Lectures I will be writing commentaries on the BISC 150 lectures I give to you this semester and I shall assume that you have all been to lecture and that you have taken good notes. These commentaries are intended to aid in your understanding of what was discussed in class. It’s how I think about the topics. The commentaries are not a substitute for the lectures ! Commentary on Lecture 1 Jan. 13, 2009 The adult human body has 100 trillion cells (an estimate… no one has counted them all!), each of which needs to be fed constantly since very few of our cells are capable of storing molecules for future needs. Muscle cells store glucose as the starch-like polymer glycogen which is quite similar to the carbohydrate polymers mentioned in lecture. The liver and kidney store some but few other cells do. We really do not store much of it either, probably less than a pound. Amylose, amylopectin (from plants) and glycogen are representatives of one of the 3 macronutrient classes of molecules. The second class of macronutrients is protein. Proteins are composed of a linear strand of
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