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LECTURE PRESENTATIONS For CAMPBELL BIOLOGY, NINTH EDITION Jane B. Reece, Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Robert B. Jackson Chapter 4 Carbon and the Molecular Diversity of Life Lectures by Erin Barley Kathleen Fitzpatrick © 2011 Pearson Education, Inc. Overview: Carbon: The Backbone of Life • Why is carbon considered the Backbone? • How does it become a part of living systems? • What processes are critical to the cycle of carbon? © 2011 Pearson Education, Inc. Figure 4.1 Concept 4.1: Organic chemistry is the study of carbon compounds • CHNOPS © 2011 Pearson Education, Inc. Organic Molecules and the Origin of Life on Earth • Stanley Miller’s - abiotic synthesis of organic compounds • Experiments support the idea that abiotic synthesis of organic compounds, perhaps near volcanoes, could have been a stage in the origin of life © 2011 Pearson Education, Inc. Figure 4.2 EXPERIMENT “Atmosphere” CH4 Water vapor Electrode Condenser Cooled “rain” containing organic molecules H2O “sea” Sample for chemical analysis Cold water Concept 4.2: Carbon atoms can form diverse molecules by bonding to four other atoms • Electron configuration – is the key to an atom’s characteristics – determines the kinds and number of bonds an atom will form with other atoms © 2011 Pearson Education, Inc. Figure 4.3 Name and Comment Molecular Formula (a) Methane CH4 (b) Ethane C2H6 (c) Ethene (ethylene) C2H4 Structural Formula Ball-andStick Model Space-Filling Model Figure 4.4 Hydrogen (valence 1) Oxygen (valence 2) Nitrogen (valence 3) Carbon (valence 4) Figure 4.UN01 Urea Figure 4.5a (a) Length Ethane Propane Figure 4.5b (b) Branching Butane 2-Methylpropane (commonly called isobutane) Figure 4.5c (c) Double bond position 1-Butene 2-Butene Figure 4.5d (d) Presence of rings Cyclohexane Benzene Hydrocarbons • Hydrocarbons organic molecules consisting of only carbon and hydrogen can undergo reactions that release a large amount of energy © 2011 Pearson Education, Inc. Figure 4.6 Nucleus Fat droplets 10 m (a) Part of a human adipose cell (b) A fat molecule Isomers • Isomers are compounds with the same molecular formula but different structures and properties – Structural isomers have different covalent arrangements of their atoms – Cis-trans isomers (geometric) have the same covalent bonds but differ in spatial arrangements – Enantiomers are isomers that are mirror images of each other © 2011 Pearson Education, Inc. Figure 4.7 (a) Structural isomers (b) Cis-trans isomers cis isomer: The two Xs are on the same side. trans isomer: The two Xs are on opposite sides. (c) Enantiomers CO2H CO2H H NH2 CH3 L isomer NH2 H CH3 D isomer Figure 4.7a (a) Structural isomers Figure 4.7b (b) Cis-trans isomers cis isomer: The two Xs are on the same side. trans isomer: The two Xs are on opposite sides. Figure 4.7c (c) Enantiomers CO2H H CO2H NH2 CH3 L isomer NH2 H CH3 D isomer Figure 4.8 Drug Condition Ibuprofen Pain; inflammation Albuterol Effective Enantiomer Ineffective Enantiomer S-Ibuprofen R-Ibuprofen R-Albuterol S-Albuterol Asthma The Chemical Groups Most Important in the Processes of Life • Functional groups involved in chemical reactions The number and arrangement give each molecule its unique properties © 2011 Pearson Education, Inc. Figure 4.UN02 Estradiol Testosterone ATP: An Important Source of Energy for Cellular Processes • One phosphate molecule, adenosine triphosphate (ATP), is the primary energytransferring molecule in the cell • ATP consists of an organic molecule called adenosine attached to a string of three phosphate groups © 2011 Pearson Education, Inc. Figure 4. UN05 Reacts with H2O Adenosine Adenosine ATP Inorganic phosphate ADP Energy