bibc100handout1

bibc100handout1 - BIBC 100 DI1 Ruby Liu hyliu@ucsd.edu...

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BIBC 100 DI1 Ruby Liu hyliu@ucsd.edu Office hour by appointment. Water - hydrogen bond - o water tends to hydrogen bond with another water molecule and that is why water remains liquid under room temperature. o Partial positive charge and partial negative charge of water molecule. H is electron poor (parital positive) and O is relatively electron strong (partial negative). Hydorgen always bond to the atoms that have F, O, or N. Never see hydrogen bonding with carbon. Why? Because Carbon is not electronegative and you cannot induce partial positive on H and partial negative on C, thus cannot induce hydrogen bonding. Hydrogen bond is strongest when you have linear bonding. Weaker when the bonding are bended. A molecule’s ability to form hydrogen bond determines the moelcule’s solubility in water. Also, the number of hydrogen bonds determine the strength of the bonding. That is why AT is easier to break than GC. Because AT has 2 strong H bonds and GC has 3 strong H bonds. - Hydrophobic effect o When you have chains of fatty acids, you will find that these fatty acids tend to cluster together. This is due to hydrophobic effect. However, don’t get tricked by the name. Hydrophobic effect occurs not because fatty acids “like” to get together and form a cluster. Hydrophobic effect occurs because water molecules seek for greatest disorder (entropy), and this seeking for disorder leads to
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bibc100handout1 - BIBC 100 DI1 Ruby Liu hyliu@ucsd.edu...

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