150 081 Lecture 1

150 081 Lecture 1 - Commentaries on BISC 150 Lectures...

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Commentaries on BISC 150 Lectures Commentary on Lecture 1 Jan 15, 2008 The adult human body has 200 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 amino acids(which we’ll describe in more detail soon) that can contain as few as 40 or as many as 2,500 amino acids. There are 20 different kinds of amino acids. All living cells in all living species use the same kinds of amino acids as we do so cells of any organism can be used as a source of protein by any other organism. But since proteins (even those
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150 081 Lecture 1 - Commentaries on BISC 150 Lectures...

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