BIOL 1107 1nd Edition Lecture 4 Outline of Last Lecture I Polymer Organic Macromolecules II Dehydration Condensation III Carbohydrates IV Disaccharides V Polysaccharides VI Nucleic Acids VII Nitrogenous Base Outline of Current Lecture I II III IV V VI Nucleic Acid Structure Lipids Triglycerides Phospholipids Sterols Proteins Current Lecture I Nucleic Acid Structure RNA folds in on itself duplexes DNA forms double helices contains hydrogen bonding DNA RNA hybrid helices These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute Question DNA molecules are composed of two strands One strand of a molecule is shown below What is the sequence of the other strand 5 G C A T G T C A A 3 3 C G T A C A G T T 5 5 and 3 show polarity and they have to be complementary Remember polarity when asked to draw complementary bases II Lipids In cell membranes lipid bilayer All lipids do not dissolve well in water There are different types of lipids Lipids do not have a monomeric unit Two classes of lipids fatty acids glycerol There are some oxygens present in lipids but they are not abundant III Triglycerides Characteristics of triglycerides can vary Just depends on what fatty acids are attached Butter saturated fats Plants Oils unsaturated Interactions between molecules IV Phospholipids Question Draw what happens when phospholipid interacts with water Two structures can be formed shown below Bilayer Micelle V Sterols Cholesterol made from sterols If you eat before blood sample is taken lot of fat will be present in plasma sample How does the body transport lipids in blood Proteins bind to fatty acids which transport them VI Proteins Body uses protein for a very wide variety things Enzymes that break things apart and put things together Used in connective tissue and muscle tissue Example When you cook an egg ovalbumin protein is denatured Proteins are very important for signaling What is the monomeric unit of protein Amino acids Know what categories amino acids belong to Amino acids are nonpolar Structure of Amino Acids
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