Bio lectures 2-5.doc

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7 Nov 2012
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BIO LECTURE ONE
Not important
BIO LECTURE TWO- Sept 15th
CELL BIOLOGY
SKIM CHAPTER 2 IN TEXT
Cancer research taking us to the fundamental workings of cells
cancer cells are just doing what they are designed to do; cells have always been
successful at dividing so what makes us think we can stop them
we are trying to subvert their ability to do what they are programmed to do
General Focus of these next few lectures: ORIGIN OF CELLS AND HOW CELLS
DIVIDE
-lecture of the mayo example
CLICKER QUESTION: Why do water molecules have an uneven distribution of + and -
charge?
a) Oxygen is quite electronegative
b) Two hydrogens and only one oxygen
c) Water dissociates into OH- and H+
d) Electrons are pulled to other molecules
Answer: A)
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oxygen has a large nucleus, high affinity for electrons being shared in a water molecule
so electrons spend more time orbiting oxygen, making them slightly more negative and
the hydrogens slightly positive making water polar
-the polarity makes individual water molecules attract each other. THEY LIKE TO
STICK TOGETHER (ie doesn’t like to be gas)
-the oxygen (-) end of one water molecule attracts the hydrogen (+) end of another
water molecule
-this means that water is liquid at ambient temperatures on earth (ie because of high
polarity and intermolecular attraction)
-attraction between water molecules squeezes out the oil which is less dense so it ends
up floating on the top
-stearic acid, long hydrocarbon, no polarity, very equal distribution of electrons
-basically its a fatty acid
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-because this molecule is straight, its saturated ie look for it in animal fats
-oleic acid, unsaturated fatty acid, look for it in olive oil, plant oils etc
-ie liquid at room temp because of the kink, they don’t pack well together
-3 fatty acids hooked to glycerol creates a triglecide
-this one has straight chains attached therefore saturated fatty acid
-whole triglyercide molecule is still non-polar
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