Concepts in Biology 10th ed., - Enger-Ross

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Sample text

A polyunsaturated fatty acid is one that has a great number of double bonds in the carbon skeleton. When glycerol and three fatty acids are combined by H H Linoleic acid three dehydration synthesis reactions, a fat is formed. Notice that dehydration synthesis is almost exactly the same as the reaction that causes simple sugars to bond together. Fats are important molecules for storing energy. There is more than twice as much energy in a gram of fat as in a gram of sugar, 9 calories versus 4 calories.

Cl– e Atom OH Ionically Bonded Molecule Ion Ionization – OH H+ H Ionization 31 Simple Things of Life OH– H+ H+OH– e– dissociation H+ Acids are ionically bonded molecules which when placed in water dissociate into hydrogen (H+) ions. Bases or alkaline substances have a slippery feel on the skin. They have a caustic action on living tissue, changing it into a soluble substance. A strong base is used to react with fat to make soap, giving soap its slippery feeling. Bases are also used in certain kinds of batteries, that is, alkaline batteries.

13 A Phospholipid Molecule This molecule is similar to a fat but has a phosphate group in its structure. The phosphate group and two fatty acids are bonded to the glycerol by a dehydration synthesis reaction. Molecules like these are also known as lecithin. The diagram of phospholipid molecules are shown as a balloon with two strings. The balloon portion is the glycerol and phosphate group while the strings are the fatty acid segments of the molecule. Steroids, another group of lipid molecules, are characterized by their arrangement of interlocking rings of carbon.

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