01:119:115 Lecture Notes - Lecture 3: Chloroform, Glycogen, Phospholipid

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Lecture 3 - biological molecules: biological importance of carbon. Living organisms consist mostly of: 70-90% water. Carbon chains = skeletons of most organic molecules. Structure of functional groups is key to molecular function. Any h can be replaced by a functional group = change in function. Forms hydrogen bonds with water making it hydrophilic. Ethanol, the alcohol present in alcoholic beverages. Two o"s very close together = very electronegative. H+ (proton) is easily released acidic. Two -sh groups can react forming stable cross-links . Parts of phospholipids and nucleic acids (dna, rna) Large complex molecules with thousands of atoms. Polymer - molecule made of many similar monomers. 3 of the 4 classes of life"s organic molecules form polymers. Carbs (monomer = monosaccharide (glucose) glycosidic bonds) Proteins (monomer = amino acid peptide bonds) Nucleic acids (monomer = nucleotide diphosphoesther bond) Lipids (only have a few molecules to make the macromolecule so it doesn"t define as a polymer ester bonds)

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