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2.3: Carbon-Based Molecules. Carbon-based molecules are the foundation of life. Bonding Properties of Carbon. Carbon forms covalent bonds with up to four other atoms, including other carbon atoms. 1. 2. 3, 4. Structure of carbon-based molecules…. Three general types: straight chain.

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2.3: Carbon-Based Molecules


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    1. 2.3: Carbon-Based Molecules

    2. Carbon-based molecules are the foundation of life.

    3. Bonding Properties of Carbon • Carbon forms covalent bonds with up to fourother atoms, including other carbon atoms. 1 2 3, 4

    4. Structure of carbon-based molecules… • Three general types: • straight chain H  H   Cl H   H      |   |    |   |    |H - C- C - C - C - C - H      |   |    |  |    |     H   H   H  H   H          3-chloropentane

    5. Structure of carbon-based molecules… • Three general types: 2. Branched chain

    6. Structure of carbon-based molecules… • Three general types: 3. Ring

    7. Many carbon-based molecules are made of many small subunits bonded together. • Monomers are the individual subunits. • Polymers are made of many monomers.

    8. Four Types of Carbon-Based Molecules Carbohydrates Lipids Proteins Nucleic Acids ALL four are found in LIVING things.

    9. Carbohydrates • Organic molecules made of the elements carbon, hydrogen, and oxygen(CHO) • Includes sugars and starches • Pasta, bread, and fruit are high in carbohydrates

    10. Structure of Carbohydrates • Monomer • Monosaccharides • “saccharide” means sugar • simple sugars • Glucose, galactose, fructose

    11. Structure of Carbohydrates • Disaccharide • Two monosaccharide molecules bonded together • Sucrose, or table sugar, made of one glucose and one fructose molecule

    12. Structure of Carbohydrates • Polymer • Polysaccharides • Chains of monosaccharides • starches, cellulose, and glycogen

    13. Function of Carbohydrates • Can be broken down to provide energy for cells. • Glucose-main source of energy for cells, product of photosynthesis • Provide us with energy • Sugar rush then crash • Some carbohydrates are part of cell structure. • Cellulose-makes up the cell wall of plant cells

    14. LIPIDS • Organic molecules made of the elements carbon, hydrogen, and oxygen (CHO) • Nonpolar molecules • Do not dissolve in water • Include fats, oils, cholesterol, and wax

    15. Structure of Lipids • Fatty acids bonded to glycerol. • Glycerol-3 hydroxyl groups • Fatty acids-long carbon chains • Two different types of fatty acids found in fats and oils: • Saturated fatty acids • Unsaturated fatty acids

    16. Two Types of Fatty Acids

    17. Functions of Lipids • Used for long term energy storage • Make up cell membranes • Phospholipidbilayer • Used to make hormones • Testosterone (males) & estrogen (females) • Insulate and waterproof organisms • Cutin-waxy substance that coats leaves of plants to help prevent water loss

    18. Lipid Polymer-Phospholipid • Consists of glycerol, two fatty acids (nonpolar tails) and a phosphate group (polar head of molecule) • Makes up ALL cell membranes

    19. Lipid Polymer-Triglycerides • Consists of glycerol and three fatty acids • Type of fat found in your blood. • Your body uses them for energy. • You need some triglycerides for good health. • But high triglycerides can raise your risk of heart disease and may be a sign of metabolic syndrome

    20. Nucleic Acids • EXTREMELY long carbon-based molecules made of carbon, hydrogen, oxygen, nitrogen, and phosphorus (CHONP)

    21. nitrogen-containing molecule,called a base A phosphate group deoxyribose (sugar) Structure of Nucleic Acids • Monomer • Nucleotide • made of a five-carbon sugar, phosphate group, and a nitrogen base. • 5 kinds: Adenine, Thymine, Cytosine, Guanine, & Uracil • Polymers • DNA-Deoxyribonuleic Acid • RNA-Ribonucleic Acid

    22. DNA RNA Function of Nucleic Acids • DNA stores genetic information • RNA builds proteins using information from DNA

    23. Proteins • Large organic molecules made of carbon, hydrogen, oxygen, and nitrogen (CHON) • Essential to all life • Foods high in proteins: • Poultry, fish, eggs, beans, nuts, peanut butter, milk

    24. Structure of Proteins • Monomer • Amino acid • Contain an amino group and a carboxyl group • Interact to give a protein its shape and function • Peptide bonds form between amino acids to form chains • Organisms use 20 different amino acids to build proteins • Your body makes 12, others come from food you eat

    25. Structure of Proteins • Polymer • Protein • Also called polypeptide • Each protein has a different arrangement of amino acids • Incorrect amino acid sequence and/or arrangement changes the protein’s structure and function

    26. Function of Proteins • Building and connecting materials of living things • Collagen-forms bones, tendons, ligaments, and cartilage • Take part in chemical reactions and transport materials • Hormones, antibodies, and enzymes

    27. Function of Proteins • Longer-lasting energy source than carbohydrates because broken down more slowly • Involved in eyesight, digestion, etc. as well

    28. 2.5: Enzymes Enzymes are catalysts for chemical reactions in living things.

    29. Chemical Reactions • Substances are changed into different substances by breaking and forming chemical bonds • Reactants are changed to form products • Cell growth, reproduction, interaction with the environment, and response to stimuli are the result of a chemical reaction Reactants  Products

    30. Catalysts • Lowers activation energy • Speed up chemical reactions

    31. Activation Energy • Energy that needs to be absorbed for a chemical reaction to start • Energy reactants need in order to react • Break bonds and form new ones

    32. Rate of Chemical Reactions • Biochemical reactions must occur at certain speeds, or rates, in order to be useful. • Rate of a reaction depends on: • Temperature • Concentration of the chemicals • Surface area

    33. Enzymes as Catalysts • Enzymes are proteins • Makes reactions that happen in cells possible • Lower activation energy and speed up reaction rate • Without enzymes, many reactions would not happen • Others would occur too slowly for the organism to survive • Enzyme will not be used up or changed during the reaction

    34. substrates (reactants) enzyme Substrates bind to anenzyme at certain places called active sites. Structure of Enzymes • Gives reactants a site where they can come together to react • Substrates-reactants affected by enzyme • Substrates bind to the active site • Shape of substrate and active site are complimentary, or opposite • Fit together like a lock and key

    35. Substrates bind to anenzyme at certain places called active sites. The enzyme bringssubstrates together and weakens their bonds. The catalyzed reaction formsa product that is releasedfrom the enzyme. Lock and Key Model Illustrates how enzymes function

    36. Structure of Enzymes • Allows only certain reactants to bind to the enzyme • An organism may have thousands of different enzymes • Each is specific to one chemical reaction • An enzyme’s function depends on its structure.

    37. Functions of Enzymes • Energy-releasing enzymes power cell functions • Enzymes in nerve cells produce neurotransmitters to carry impulses from nerves to muscles • Muscle cells have enzymes that are triggered in response to the neurotransmitters

    38. Functions of Enzymes • Blood contains enzyme carbonic anhydrase • Catalyzes reaction in your blood where carbon dioxide combines with water to form carbonic acid • Makes reaction one million times faster so that carbon dioxide does not build up in your blood, which could be fatal • Enzyme lipase in the pancrease • Speeds up digestion of lipids

    39. Functions of Enzymes • Disruptions in homeostasis can prevent enzymes from functioning. • Enzymes function best in a small range of conditions. • Changes in temperature and pH can break hydrogen bonds. • Destroyed at temperatures above 50˚C • Work best at pH of 7