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Figure 4.0 Protein Figure 4.1 Abiotic synthesis of organic compounds under “early Earth” conditions Figure 4.2 The shapes of three simple organic molecules Figure 4.2x Shapes of Molecules Ethane Methane Ethene Figure 4.3 Valences for the major elements of organic molecules Figure 4.x1 Urea Figure 4.4 Variations in carbon skeletons Figure 4.4x Hydrocarbons: molecular models Butane Isobutane Hexane Cyclohexane Figure 4.5 The role of hydrocarbons in fats Figure 4.6 Three types of isomers Figure 4.6ax Structural isomers Figure 4.7 The pharmacological importance of enantiomers Table 4.1 Functional Groups of Organic Compounds Figure 4.8 A comparison of functional groups of female (estradiol) and male (testosterone) sex hormones Figure 4.8x1 Estrone and testosterone Figure 4.8x2 Male and female mallards Figure 4.8x3 Male and female peacocks Figure 4.8x4 Male and female sage grouse Figure 5.0 Spider’s web made of protein Figure 5.1 Building models to study the structure and function of macromolecules Figure 5.2 The synthesis and breakdown of polymers Figure 5.3 The structure and classification of some monosaccharides Figure 5.3x Hexose sugars Glucose Galactose Figure 5.4 Linear and ring forms of glucose Figure 5.5 Examples of disaccharide synthesis Figure 5.5x Glucose monomer and disaccharides Glucose monomer Sucrose Maltose Figure 5.6 Storage polysaccharides Figure 5.7a Starch and cellulose structures Figure 5.7b,c Starch and cellulose structures Figure 5.7x Starch and cellulose molecular models Glucose Glucose Cellulose Starch Figure 5.8 The arrangement of cellulose in plant cell walls Figure 5.x1 Cellulose digestion: termite and Trichonympha Figure 5.x2 Cellulose digestion: cow Figure 5.9 Chitin, a structural polysaccharide: exoskeleton and surgical thread Figure 5.10 The synthesis and structure of a fat, or triacylglycerol Figure 5.11 Examples of saturated and unsaturated fats and fatty acids Figure 5.11x Saturated and unsaturated fats and fatty acids: butter and oil Figure 5.12 The structure of a phospholipid Figure 5.12x Phospholipid Figure 5.13 Two structures formed by self-assembly of phospholipids in aqueous environments Figure 5.14 Cholesterol, a steroid Figure 5.14x Cholesterol Table 5.1 An Overview of Protein Functions Figure 5.15 The 20 amino acids of proteins: nonpolar Figure 5.15 The 20 amino acids of proteins: polar and electrically charged Figure 5.16 Making a polypeptide chain Figure 5.17 Conformation of a protein, the enzyme lysozyme Figure 5.18 The primary structure of a protein Figure 5.19 A single amino acid substitution in a protein causes sickle-cell disease Figure 5.19x Sickled cells Figure 5.20 The secondary structure of a protein Figure 5.21 Spider silk: a structural protein Figure 5.21x Silk drawn from the spinnerets at the rear of a spider Figure 5.22 Examples of interactions contributing to the tertiary structure of a protein Figure 5.23 The quaternary structure of proteins Figure 5.24 Review: the four levels of protein structure Figure 5.25 Denaturation and renaturation of a protein Figure 5.26 A chaperonin in action Figure 5.27 X-ray crystallography Figure 5.x3 James Watson and Francis Crick Figure 5.x4 Rosalind Franklin Figure 5.28 DNA RNA protein: a diagrammatic overview of information flow in a cell Figure 5.29 The components of nucleic acids Figure 5.30 The DNA double helix and its replication Table 5.2 Polypeptide Sequence as Evidence for Evolutionary Relationships