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Organic Compounds: Understanding their Role in Biochemistry

This chapter discusses the role of organic compounds in biochemistry, focusing on the fundamental concepts of carbon bonding, building organic molecules, and the properties of macromolecules such as carbohydrates, lipids, proteins, and nucleic acids. It explores the functions of these organic compounds in the body and their importance in maintaining health.

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Organic Compounds: Understanding their Role in Biochemistry

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  1. YOU ARE WHAT YOU EAT! BIOCHEMISTRY UNIT Chapter 2, Sections 3 & 4 Pages 44-48, 51-53 Mr. Del Rossi 2010

  2. What is an Organic Compound? • Anything that contains the following two elements: Carbon & Hydrogen

  3. I. The Role of Carbon A. Carbon can bond with numerous other elements 1. Carbon has 4 free e- in it’s outer energy level 2. It has the ability to form up to 4 covalent bonds • Types of Bonds (When 2 Carbon atoms bond) 1. Single – each carbon shares only 1 e-. 2. Double – each carbon shares 2 e-. 3. Triple – each carbon shares 3 e-.

  4. II. Building Organic Molecules A. Macromolecules - Large molecules containing hundreds of atoms. - Can vary greatly in size. Example: Proteins

  5. B. Polymer - Large molecules formed when many smaller molecules bond together. - They generally form long chain-like molecules. Example: Glucose + Fructose = Sucrose 1. Polymers are created as well as broken apart by two processes!

  6. a. Condensation Reactions - Small molecules are bonded together to make a larger one. - Each molecule loses either a –H or –OH group in order to bond. - As a result, for each bond 1 water molecule is formed. A + B = C + H2O

  7. b. Hydrolysis Reactions - Refers to the breaking apart of a polymer. - Occurs during the digestion of food molecules! C + H2O = A + B

  8. III. MACROMOLECULES A. Carbohydrates 1. AKA – Sugars, starches, fiber, grains, & roughage. 2. Jobs & Function: Are used by the cell to store & release energy. 3. Elements Present: Carbon, Hydrogen, and Oxygen a. Ratio - 1C : 2H : 1O

  9. 4. Building Blocks a.Monosaccharides (Simple Sugars) - 1 sugar molecule Examples:Glucose and Fructose b.Disaccharides - 2 monosaccharides combined Example: Sucrose (Table Sugar) (Glucose and Fructose combined via a “ ? “ reaction.) c. Polysaccharides – 3 or more monosaccharides combined Examples: Starch (plant food storage), Cellulose (in plant cell walls), and Glycogen (animal food storage).

  10. B. Lipids 1. AKA – Fats & Oils 2. Jobs & Function: 1. Major part of cell membranes 2. Long-term energy storage 3. Insulation. 3. Organic compounds composed of the elements: Carbon, Hydrogen, & Oxygen a. No specific ratio of C : H : O. 4. Building Blocks - Fats & Glycerol

  11. 5. Examples: a. Saturated Fats - Solid at room temperature - All single bonds between carbons! Examples are: Butter & Lard b. Unsaturated Fats - Liquid @ room temperature - One or more double bonds between carbons! - Oils (vegetable, olive, corn sesame, etc….)

  12. 6. Cholesterol a. Soft waxy substance found in your bloodstream with lipids. b. Used to form cell membranes, some hormones, and is needed for other cell functions. c. Lipoproteins 1. Transport cholesterol to & from cells. a. LDL (Low-Density-Lipoprotein) “Bad Cholesterol” 1. Carries cholesterol in the blood. Too much can form plaque in arteries. b. HDL (High-Density Lipoprotein) “Good Cholesterol” 1. Takes cholesterol out of blood and back to liver.

  13. 7. TransFats (Hydrogenated Oils) a. Made by “hydrogenating” oils to make them solid. b. Hydrogenating means “adding hydrogen.” c. When consumed, increases your LDL concentration.

  14. C. Proteins 1. Large polymer composed of: C, H, O, N, and S. 2. Essential for all life. 3. Building Blocks a. Proteins are made of amino acids (20 Types of A.A.’s) 1. Amino Acids are linked together by condensation reactions.

  15. 4. Jobs & Functions a. Makes up fibers of Muscles b. Make-up antibodies c. Make-up Enzymes (Enzymes allow reactions to occur) d. Used as messengers (transport oxygen in bloodstream) 5. Examples: Antibodies, Enzymes, Hair, Muscles, & “Some” Vitamins

  16. Amino Acid Structure Parts: (Page 47 in textbook) 1. Amino Group 2. Carboxyl Group 3. Functional Group (R-Group)

  17. Linking Amino Acids:

  18. D. Nucleic Acids 1. Definition - A complex macromolecule that stores information in the form of a code. 2. Building Blocks - Made up of smaller subunits called nucleotides. 3. Elements Present - Carbon, Hydrogen, Oxygen, Nitrogen, and Phosphorus.

  19. 4. Jobs & Functions a. Contain Hereditary Information b. Contain instructions on how to make proteins. 5. Examples a. DNA – The master copy of an organism’s information code. b. RNA – Codes for a copy of DNA used in protein synthesis.

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