Carbon and the Molecular Diversity of Life. Chapter 4
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1 Carbon and the Molecular Diversity of Life Chapter 4
2 CARBON Carbon is has ability to form large and complex, molecules Aspirin molecular formula? A triglyceride
3 Organic chemistry is study of carbon compounds Ethanol Hemoglobin
4 (Wohler 1828) organic molecules can be synthesized from inorganic Don t need a kidney to make urea!
5 Stanley Miller 1953 CH 4 Water vapor Atmosphere Electrode sparks Organic molecules can arise spontaneously (abiotic synthesis) primitive sea conditions Condenser Cold water Cooled water containing organic molecules Sample contains amino acids, hydrocarbons
6 Miller Evidence for evolution Physical/natural laws govern all natural phenomena New Scientist Stanley Miller s exp
7 Carbon forms diverse molecules by bonding to 4 other atoms usually H, O, N Name (a) Methane Molecular Formula Structural Formula Ball-and-Stick Model Space-Filling Model (b) Ethane (c) Ethene (ethylene)
8 Molecular Diversity Arises from Carbon Chains Carbon chains form organic molecules Why are these called hydrocarbons? Ethane Propane 1-Butene 2-Butene (a) Length (c) Double bonds Butane (b) Branching 2-Methylpropane (commonly called isobutane) Cyclohexane (d) Rings Benzene
9 Hydrocarbons hydrophobic undergo reactions that release large amount of energy (ex. Fossil fuels) Ex. fats C 3 H O 2 4 H 2 O + 3 CO 2 + Energy
10 Hydrocarbon: Fat is a fuel reserve in animals A triglyceride = why?
11 Isomers same molecular formula, but different atom bonding Structural isomers
12 Stereoisomer are handed Thalidomide, given for morning sickness in Europe in late 1950s. Sedative. Found to be teratogen Was found in some animals that only the S stereoisomer is teratogenic but turns out they both are.
13 Functional groups are key to function of biological molecules Estradiol Testosterone Both steriods, both have 4 fused rings, note functional groups
14 The 7 functional groups most important in life: 1. Hydroxyl group OH
15 2. Carbonyl group C=O
16 3. Carboxyl group -COOH Acetic acid Acetic acid Acetate ion
17 4. Amino group -NH2 Amino STRUCTURE Amines NAME OF COMPOUND EXAMPLE Glycine Acts as a base; can pick up an H + from the surrounding solution (water, in living organisms). FUNCTIONAL PROPERTIES Because it also has a carboxyl group, glycine is both an amine and a carboxylic acid; compounds with both groups are called amino acids. (nonionized) (ionized) Ionized, with a charge of 1+, under cellular conditions.
18 5. Sulfhydryl group -SH Thiols Cysteine Cysteine is an important sulfur-containing amino acid. Two sulfhydryl groups can react, forming a covalent bond. This cross-linking helps stabilize protein structure. Cross-linking of cysteines in hair proteins maintains the curliness or straightness of hair. Straight hair can be permanently curled by shaping it around curlers, then breaking and re-forming the cross-linking bonds.
19 6. Phosphate group -PO 4 Phosphate STRUCTU RE Organic phosphates NAME OF COMPOU ND EXAMPL E Glycerol phosphate In addition to taking part in many important chemical reactions in cells, glycerol phosphate provides the backbone for phospholipids, the most prevalent molecules in cell membranes. Contributes negative charge to the molecule of which it is a part (2 when at the end of a molecule; 1 when located internally in a chain of phosphates). Has the potential to react with water, releasing energy. FUNCTION AL PROPERTI ES
20 7. Methyl group -CH 3 STRUCTURE Methyl EXAMPLE 5-Methyl cytidine 5-Methyl cytidine is a component of DNA that has been modified by addition of the methyl group. Addition of a methyl group to DNA, or to molecules bound to DNA, affects Arrangement of expression of genes. methyl groups in male and female sex hormones affects their shape and function.
21 ATP: Energy for Cellular Processes adenosine attached to a string of 3 phosphates
22 1 phosphate split off to form ADP + energy
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