Chapter 2: Atoms and Molecules of Ancient Earth

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Presentation transcript:

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

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

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

Chapter 2: Chemical Components of Cells The pH scale

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

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

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

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

Macromolecules *Proteins Polypeptide Protein

*Synthesis of a polypeptide

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