PCC BIO 127IN - Bio-Molecules (24 pages)

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Bio-Molecules



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Bio-Molecules

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Lecture Notes


Pages:
24
School:
Pima Community College
Course:
Bio 127in - Human Nutrition & Biology
Human Nutrition & Biology Documents

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BIO MOLECULES A few examples of organic molecules involved in biology and nutrition are listed below below carbohydrates y lipids amino acids proteins vitamins We ll be looking at these individually We ll in the remainder of this tutorial Carbohydrates Carbohydrates include molecules such as sugars g and starches But theyy also include nondigestible carbohydrates called fibers fibers Fibers will be discussed in more detail in another tutorial In general sugars are the simplest of carbohydrates b h d t while hil starches t h and d fib fibers are more complex in structure In fact starches and fibers tend to be made up p of a b bunch nch of ssugars gars linked together The most common sugar is glucose Below is a cartoon illustration of glucose molecule and a starch molecule ag Glucose Starch Note a similar explanation and illustrations are given in your book in chapter 4 Here again is another illustration of a starch molecule Recall that the lines represent molecule covalent bonds a couple are pointed to below A large molecule made up of below smaller units joined together like this starch molecule is called a polymer Covalent bond Covalent bond Molecular Model Kit Glucose Glucose Fructose Maltose Lipids As mentioned A ti d previously i l lilipids id d do not dissolve in water Substances that don t dissolve in water are called ll d hydrophobic h d h bi water fearing fearing Examples of lipids are triglycerides cholesterol triglycerides cholesterol phospholipids and fatty acids A cartoon illustration of a lipid in this case a triglyceride is shown below triglyceride below A triglyceride is composed of a glycerol molecule covalently bonded to three fatty acid molecules GLYCEROL Stearic Acid Oleic Acid Linoleic Acid Glycerol Triglyceride Triglyceride GLYCEROL GL LYCERO OL Phospholipid Sucrose Olestra Proteins Proteins are large molecules composed of amino acids linked together in a long chain Therefore chain Therefore proteins are also examples of polymers Both a single



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