1. The Chemical Composition of Cells

2. Organic & Inorganic Living things contain both organic and inorganic molecules. Most of the molecules in living organisms are organic, that is they contain carbon.

3. Inorganic Molecules Of the inorganic components of cells Water & minerals are the most important. CO 2 is also classified as inorganic because it is not a complex molecule and does not contain hydrogen.

4. Water Is the main component of organisms (cells are 80% water) In cytoplasm - Provides the fluid environment that metabolic reactions occur in Water is the universal solvent (most salts dissolve easily) Water provides support & turgor to the cell.

5. Minerals Minerals are inorganic compounds in the food we eat. They are used in many structures of the body such as bones, teeth & blood. Over 20 different minerals needed for the human body. E.g. Calcium, Iron, Magnesium, Potassium, Sodium, etc.

6. The Organic Components of Cells

7. Organic Compounds The organic compounds commonly found in cells are: Carbohydrates Lipids Nucleic Acids Proteins

8. Carbohydrates Basic subunit is a sugar Monosaccharide (glucose) Join together to form complex carbohydrates  Polysaccharides (starch, cellulose)

9. Proteins Building a protein: Begins with amino acids Amino acids come together to make a string of polypeptides Polypeptide chains fold and form into a variety of shapes based on their programmed function

10. Lipids Fats, oils, and waxes Hydrophobic molecules Typically, fats and waxes are solid at room temperature, oils are liquid FAT = glycerol + fatty acid

11. Nucleic Acids DNA: deoxyribonucleic acid Located in chromosomes in nucleus of eukaryotic cells String of nucleotides in a paired chain

12. i Organic molecules needed by body in minute amounts Required for many metabolic processes Water soluble - B and C, cannot be stored Fat soluble – A D E K, too much can be harmful Vitamins