BIO120H1 Lecture 3: Lecture 3 readings.docx

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18 Apr 2012
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BIO120H1 Full Course Notes
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BIO120H1 Full Course Notes
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Water is the most abundant substance in cells. Unequal distribution of electron in water molecule. Hydrophilic molecules react with water (dna rna proteins included) Hydrocarbons because they have nonpolar bond with carbon, bond is fulfilled, and thus like will not dissolve unlike. Water can act as acid and base looking at equilibrium in the forwards and backwards reactions, backwards being the conjugate base and acid reacting. Ph stays around 7 in cell as buffers help keep it there. Four types of noncovalent attractions help bond molecules in cells: electrostatic attractions: Result from attractive forces between oppositely charged atoms. Readily form in case of two atoms with permanent dipoles but are strongest with fully charged molecules (ionic bonding). Water mucks everything up by reducing charge by them placing there own charge to make the molecules happy: hydrogen bonding: Hydrogen bonds to a highly electronegative molecule making the hydrogen have a positive charge and the other molecule very negative.

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