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The Molecular Basis of Life: Part III

Lipids and Nucleic Acids
by

Timothy Riggs

on 30 September 2014

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Transcript of The Molecular Basis of Life: Part III

The Molecular Basis
of Life: Part III Lipids and Nucleic Acids large molecules composed mostly of
carbon and hydrogen with small amounts of oxygen lipids =
fats, oils, waxes
and steroids Lipids are insoluble
in water. Why? Since lipids are nonpolar they are not attracted by polar water molecules. What do we mean by
polar and nonpolar? A molecule that has
a positive and a negative end is said to be a polar molecule. common lipid =
3 fatty acids
one glycerol saturated fatty acid:
carbons connected by single bonds

unsaturated fatty acids:
a double bond is present somewhere in the carbon chain

polyunsaturated fatty acid:
more than one double bond is present in the carbon chain Cells use lipids for:
energy storage
insulation
protective coverings
major component of cell membranes Lipids Nucleic
Acids nucleic acids are:
important organic compounds
stores cellular information in the form of a code
polmers made of subunits called nucleotides Nucleotides consists of:
hydrogen
oxygen
nitrogen
and phosphorus The atoms of nucleotides are arranged in three groups:
a nitrogenous base
a simple sugar
a phosphate group DNA
(a.k.a. deoxyribonucleic acid)
is a nucleic acid! DNA is the master copy of an organism's genetic information.
What's in this information? DNA code:
contains instructions to form enzymes
contains instructions to form structural proteins
determines how an organism looks and acts
is passed on from one generation to the next RNA is another important nucleic acid! RNA is
ribonucleic acid. RNA copies DNA for use in making proteins! The differences between
RNA and DNA are minor
but they are very important!
Full transcript