MOVING FROM ECOLOGY TO BIOCHEMISTRY. BIOCHEMISTRY LEVELS OF ORGANIZATION Organisms Organ Systems OrgansTissues CellsMoleculesAtoms Subatomic Particles.

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Presentation transcript:

MOVING FROM ECOLOGY TO BIOCHEMISTRY

BIOCHEMISTRY LEVELS OF ORGANIZATION Organisms Organ Systems OrgansTissues CellsMoleculesAtoms Subatomic Particles

BIOLOGICAL BONDS (CONCEPT 2.3) TYPES OF BONDS & INTERACTIONS COVALENT BONDS IONIC BONDS HYDROGEN BONDS HYDROPHOBIC & HYDROPHILIC INTERACTIONS VAN DER WAALS INTERACTIONS

COVALENT BONDS VALENCE ELECTRONS ARE SHARED BY TWO ATOMS THERE ARE TWO TYPES POLAR – SHARED UNEQUALLY NONPOLAR – SHARED EQUALLY (O=O, H-H)

IONIC BONDS SOME ATOMS ATTRACT VALENCE ELECTRONS SO UNEQUALLY THAT THE MORE ELECTRONEGATIVE ATOM STEALS THE ELECTRON AWAY FROM THE LESS ELECTRONEGATIVE

HYDROGEN BONDS THE SLIGHTLY POSITIVE HYDROGEN ATOM OF A POLAR MOLECULE IS ATTRACTED TO THE SLIGHTLY NEGATIVE ATOM OF ANOTHER MOLECULE WATER IS POLAR

HYDROPHOBIC & HYDROPHILIC INTERACTIONS HYDROPHOBIC – “WATER-FEARING” NONPOLAR MOLECULES NO AFFINITY FOR WATER HYDROPHILIC – “WATER-LOVING” POLAR MOLECULES HAVE AN AFFINITY FOR WATER

VAN DER WAALS INTERACTIONS WEAK INTERACTIONS BETWEEN MOLECULES OR PARTS OF MOLECULES THAT RESULT FROM TRANSIENT LOCAL PARTIAL CHARGES WAIT. WHAT? VIDEO

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