..ooo AT&T; 3:24 PM 8 3296. blackboard.uncfsu.edu ¢ 16. Which vitamin is derived
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..ooo AT&T; 3:24 PM 8 3296. blackboard.uncfsu.edu ¢ 16. Which vitamin is derived from cholesterol B12 17. Identify the molecule(s) derived from sterols Arachidonic acid Phosphatidylglycerol Vitamin D Short Answer Questions 18. Circle the fatty acid in each pair that has the higher melting (a) 18:009 182 912 (b) 18:0 18:109 (c) 18:0 16:0 19. Describe the dependence of the melting point of a fatty acid upon (a) chain length and (b) unsaturation. 20. Match the compounds on the left with the important roles they play listed on the right. (Answers are used only once) (a) prostaglandins blood clotting (b) sphingolipidsnecessary for sight (d) vitamin A important component of myelin 21. Match each of these vitamins with its biological role: Vitamins A, D. E, K blood clotting Vision _ Ca.. and phosphate metabolism -prevention of oxidative damageExplanation / Answer
16-D. 17-vitamine D
20- vitA- neccesary for vision
prostaglandins -mediates pains & inflammation
sphingolipids-important component of myclin membrane
Thromboxanes- blood clotting
21-
A- vision
D- Ca+2 & phosphate metabolism
K- blood clotting
E-prevent oxidative damage
19-Fatty acids are carboxylic acids with long hydrocarbon chain (C=10 to30).
Unsaturation -Fatty acid with unsaturation have low melting point.Presence of one or more double bonds in the hydrocarbon chain in unsaturated fatty acids results in one or more "bends or Kink" in the molecule. The geometry of the double bond is almost always a cis configuration in fatty acids. and so these molecules do not have a stable repeating array or crystalline lattice . The intermolecular interactions are weaker in unsaturated molecules. As a result, the melting points are much lower for unsaturated fatty acids.
Chain length -when lenth of fatty acid increases melting point also increases due to increase of C-atom in molecule.
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