Biomolecules 1 Macromolecules in Organisms There are four major classes of macromolecules found in living things: Carbohydrates Lipids Proteins Nucleic Acids 2 Carbohydrates • Used for immediate and stored energy, and as a building material in the cell. • Contain elements C,H,O 3 Three Groups of Carbohydrates •Monosaccharides - “one sugar” •Disaccharides - “two sugars” •Polysaccharides - “many sugars” 4 Monosaccharides: • “One Sugar” • Simplest of all sugars • Can vary in the # of carbon (C) atoms, but the ratio of 2H:1O is always present. 5 Glucose • Glucose – 6 carbon monosaccharide that is the preferred energy source for most organisms including humans. • Chemical Formula is C6H12O6 6 Disaccharides •Two monosaccharides covalently bonded together •Examples 1) Sucrose - table sugar 2) Lactose - milk sugar 3) Maltose - grain sugar 7 Polysaccharides Many monosaccharides covalently bonded together. Divided into 2 groups based on function: *Energy storage polysaccharides and structural polysaccharides 8 Examples of Polysaccharides Glucose Monomer Starch Glycogen Cellulose 9 Storage Polysaccharides •Long polymers of glucose broken down as needed for energy. • EXAMPLES - Glycogen - Starch 10 Glycogen • Storage form of glucose in animals • Stored in liver and muscle cells in humans. **Glycogen & starch are similar in structure because BOTH are made of glucose monomers* 11 Starch • Storage form of glucose in plants • Plant cells store starch for energy • Potatoes and grains are major sources of starch in the human diet *Glycogen & starch are similar in structure because BOTH are made of glucose monomers* 12 Structural Polysaccharides • Used as a building material in many organisms EXAMPLES - Cellulose - Chitin 13 Cellulose •It is a major component of plant cell walls •Polymer made up of glucose monomers 14 Cellulose Humans & other animals cannot break down cellulose for energy. Still important as a source of fiber. Bacteria have enzymes to break down cellulose 15 Chitin • Major component of fungi cell walls as well as the exoskeleton of arthropods & insects. 16 TEST YOUR KNOWLEDGE!!!! 1. Which of the following is NOT one of the 4 biomolecules? A) Nucleic Acids B) Lipids C) Nutrients D) Carbohydrates TEST YOUR KNOWLEDGE!!!! 2. What is the name of the preferred energy source of most organisms? A) Sucrose B) Lipids C) Lactose D) Glucose TEST YOUR KNOWLEDGE!!!! 3. Polymers make up monomers. A) True B) False Lipids • Known for their insolubility in water. • Known as hydrophobic –”water fearing” • Made up of C,H,and O • Our bodies need lipids for energy, storage, insulation, and cushioning 20 Function of Lipids • Fats store energy, • Insulate the body, • Cushion and protect organs, • Serve as a component of the cell membrane. 21 Three Groups of Lipids • Fats & Oils • Phospholipids • Steroids 22 Fats & Oils •Made up of glycerol + 1 or more fatty acid tails. 23 Fats & Oils • Referred to as fat if lipid is solid at room temp. Usually from animal source. • Referred to as an oil if lipid is liquid at room temp. Usually from a plant source. 24 Fats & Oils •Classified as saturated or unsaturated •Saturated fats have been linked to heart disease. 25 Phospholipids • Primary component of all cell membranes. • Have a head that is polar • & attracted to water (hydrophilic) Have 2 fatty acid tails that are nonpolar and do not attract water (hydrophobic) 26 Steroids Ex: Cholesterol - found in cell membranes of animal cells Cholesterol Estrogen Used for hormone production & animlal cell structure. Testosterone 27 Four Types of Proteins Storage Structural Contractile Transport 28 Proteins • Molecular tools of the cell • Functions include: structure (building cells), • support, movement, hormones, enzymes, and metabolism. Contain C,H,O, and N 29 Proteins •Amino Acids – – Monomers of proteins are amino acids There are 20 amino acids that combine in different numbers, orders, and arrangements to form proteins. Proteins as Enzymes • One very impt function of proteins is to serve as enzymes •Enzymes trigger chemical reactions by serving as a catalyst •A catalyst triggers chemical reactions without being used up in the process. •Organisms could not maintain homeostasis without functioning enzymes 31 Nucleic Acids Nucleic Acids •Nucleic acids are polymers of monomers called nucleotides 33 Nucleic Acids - Nucleotides •Store and carry out the genetic code. •Contain information for heredity and for making all the body’s proteins. •Contain the elements C,H,O,N, and P 34 Deoxyribonucleic Acid •DNA –Contains the genetic code for the cell. 35 Ribonucleic Acid •RNA –Carries out the instructions in DNA. 36 Adenosine Tri-Phosphate •ATP – Provides usuable energy in all cells. 37 Macromolecules Concept Map Section 2-3 Carbon Compounds include Carbohydrates Lipids Nucleic acids Proteins that consist of that consist of that consist of that consist of Sugars and starches Fats and oils Nucleotides Amino Acids which contain which contain Carbon, hydrogen, oxygen Carbon, hydrogen, oxygen which contain which contain Carbon,hydrogen, oxygen, nitrogen, phosphorus Carbon, hydrogen,oxygen, nitrogen, 38 TEST YOUR KNOWLEDGE!!!! 1.Which of the following is NOT a function of lipids? A) Transport B) Insulation C) Energy D) Cushioning TEST YOUR KNOWLEDGE!!!! 2) The monomers of protein are A) B) C) D) Nucleotides Amino Acids Enzymes Steriods