Chapter 3

Chapter 3 - Chapter 3: The Molecules of Life Inorganic...

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Chapter 3: The Molecules of Life Inorganic Molecules WATER >>>>>>>!!!!!!! The important properties of water are attributed to its polar covalent bonds and its “V” shape. These properties make a good solvent, transport medium, coolant, and lubricant, as well as a ready participant in chemical reactions. Solvency Solvency is the ability to dissolve matter, water is called the universal solvent. Molecules that dissolve readily in water are hydrophilic (WATER LOVING) those that do not are hydrophobic (WATER HATING). When NaCl is dissolved in water, water molecules form a hydration sphere around each sodium and chloride ion. Adhesion and Cohesion Adhesion is the tendency of one substance to cling to another. Cohesion is the tendency of molecules of the same substance to cling together. Water is highly cohesive, as evidenced by its high surface tension. Thermal stability Water has a high heat capacity, meaning that it takes a large amount of heat to change the temperature of water. Chemical Reactivity. Water is a reactant or product I numerous chemical reactions within the body.
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Minerals. Minerals are inorganic elements passed to us through the food chain. They make up about 4% of the human body by weight. Most of the mineral content of the body is calcium and phosphorus, which contribute to the structure of body parts (BONE) Minerals also take part in many metabolic reactions as cofactors or electrolytes. Gases Carbon dioxide and oxygen are the two most important gases in the body. Certain gases are also used as chemical messengers, such as nitric oxide. CARBON and ORGANIC MOLECULES Carbon. Carbon is used extensively by organisms. It reacts readily to form four covalent bonds, giving it the ability to form long chains. Functional Groups . A functional group is a small cluster of atoms that determines many of the properties of the organic molecule. Monomers and Polymers Large organic molecules are called macromolecules. These are mostly polymers- repeating series of subunits (building blocks) called monomers. The joining of monomers to form a polymer is called polymerization.
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This note was uploaded on 04/17/2008 for the course BIOL 211 taught by Professor Wilson during the Fall '07 term at Winona.

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Chapter 3 - Chapter 3: The Molecules of Life Inorganic...

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