BIOL 1107 1nd Edition Lecture 4 Outline of Last Lecture I. Polymer & Organic MacromoleculesII. Dehydration/CondensationIII. CarbohydratesIV. DisaccharidesV. Polysaccharides VI. Nucleic AcidsVII. Nitrogenous BaseOutline of Current LectureI. Nucleic Acid StructureII. LipidsIII. TriglyceridesIV. PhospholipidsV. SterolsVI. ProteinsCurrent LectureI. Nucleic Acid StructureRNA folds in on itself (duplexes)DNA forms double helices (contains hydrogen bonding)DNA, RNA hybrid helicesThese 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 basesII. LipidsIn cell membranes (lipid bilayer)All lipids do not dissolve well in waterThere are different types of lipidsLipids do not have a monomeric unitTwo classes of lipids: fatty acids, glycerolThere are some oxygens present in lipids but they are not abundantIII. TriglyceridesCharacteristics of triglycerides can varyJust depends on what fatty acids are attached Butter = saturated fatsPlants/Oils = unsaturated Interactions between moleculesIV. PhospholipidsQuestion: Draw what happens when phospholipid interacts with water. Two structures can be formed (shown below)BilayerMicelleV. SterolsCholesterol made from sterolsIf 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 themVI. ProteinsBody uses protein for a very wide variety thingsEnzymes that break things apart and put things togetherUsed in connective tissue and muscle tissueExample: 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
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