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Chapter 2: Atoms and Molecules of Ancient Earth

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Presentation on theme: "Chapter 2: Atoms and Molecules of Ancient Earth"— Presentation transcript:

1 Chapter 2: Atoms and Molecules of Ancient Earth
Water: what’s the big deal? Polarity of water: *Hydrogen bonding *Cohesion water transport in plants adhesion

2 Water is the solvent of life
*solution *solvent *solute *aqueous solution *polar and ionic molecules can be dissolved in water

3 Chapter 2: Chemical Components of Cells
Hydrophilic and hydrophobic substances *hydrophilic *hydrophobic The dissociation of water molecules H2O H+ + OH- Acids and bases *acid *base

4 Chapter 2: Chemical Components of Cells
The pH scale

5 Chemical Components of Cells
*Organic chemistry *Carbon atoms *Tetrahedral shape Methane: Ethane: Ethylene:

6 Chemical Components of Cells
Variations in carbon skeletons (hydrocarbons): Hydrocarbons in fats *Isomers OH catechol hydroquinone

7 Chemical Components of Cells
*structural isomers *geometric isomers *enantiomers Example of enantiomers:

8 Macromolecules *macromolecule *most macromolecules are polymers
monomer The making and breaking of polymers: Dehydration reaction: Hydrolysis:

9 Macromolecules *Proteins Polypeptide Protein

10 *Synthesis of a polypeptide

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