BIOCHEMISTRY II REVIEW 3 - BIOCHEMISTRY II Exam 3 STUDY...

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BIOCHEMISTRY II Exam 3 STUDY GUIDE Chapter 8 Lipids What are the unique structural features of fatty acids? 1.) Essential to energy metbolism 2.) Energy economy of the cell 3.) Provides energy reserves (triglycerides) 4.) Lipohilic bile aids aid in lipid solubilization 5.) Critical roles incell physiology What is meant by saturated and unsaturated fatty acid? Saturated (solid fats) EX: butter, beef fat / Unsaturated (natural oils) EX: olive oil, corn oil No double bond Monosaturated fatty acid Hydrocarbon chain 1 double bond - cis Steric acid Oleic acid C-18 C-18 Lower T m (more liquid at room temp.) What is an essential fatty acid? Known as EFAs or the good fats, are Omega-3 fatty acids (linolenic acid), Omega-6 fatty acids (linoleic acid) What is a trans‐fatty acid? An unsaturated fatty acid with a Trans arrangement of the carbon atoms adjacent to its double bonds. Such acids occur esp. in margarines and cooking oils as a result of the hydrogenation process What type of chemical bonds link fatty acids to glycerol? 1
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Chemically , fats are generally triesters of glycerol and fatty acids . ... In other fats, a carbon atom may instead bond to only one other hydrogen atom What is saponification? Alkali hydrolysis of tryglycerols yields to formation of glycerol and free fatty acids (salt free fatty acids-soap) as products. Why lipids are the biomolecules of choice for storage of metabolic energy? A) Are soluble in water. B) Yield a large amount of energy Why diets high in trans‐fatty acids and saturated fatty acids are not good for health? Saturated and Trans fats—increase the risk for certain diseases. Why/how unsaturated fatty acids provide fluidity to membranes? An unsaturated fat has at least one unsaturated fatty acid whereas a saturated fat has none. Because the double bonds of the unsaturated fatty acids introduce kinks in the hydrocarbon backbone, unsaturated fats will not pack into a regular structure and thus remain fluid at lower temperatures. A saturated fat will pack well and be a solid a low temperatures. Where are the fats stored in the body? Fats are stored within specialised cells called adipocytes. Why membranes with unsaturated fatty acids are more flexible and fluid? Membranes with unsaturated fatty acids in their components are more flexible and fluid because: a) unsaturated fatty acids pack closely together to form What is a glycerolphospholipid? Glycerophospholipids or phosphoglycerides are glycerol -based phospholipids . They are the main component of biological membranes . What are the common head groups in glycerolphospholipid? 2
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Hydrophilic head groups (1 polar head group linked through phosphate group. What is a sphingolipid? Class of
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This note was uploaded on 04/12/2011 for the course BIOL 3362 taught by Professor Candas during the Spring '09 term at University of Texas at Dallas, Richardson.

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BIOCHEMISTRY II REVIEW 3 - BIOCHEMISTRY II Exam 3 STUDY...

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