AAAAAA_with_Key - CODE - AAAAAA - BMB462, Fall 2007 -...

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CODE - AAAAAA - BMB462, Fall 2007 - Biochemistry II 1 Exam I Name: 2.5 pt Lipids are best defned as: 1 . A ± biomolecules that are soluble in organic solvents but poorly soluble in water. B ± biomolecules that are ±ound in membranes. C ± biomolecules with the molecular ±ormula CH 3 (CH 2 ) n CH 3 . D ± biomolecules that contain ±atty acids in ester linkages. E ± biomolecules that contain ±used hydrocarbon rings. 1) A true false false false false 12.5 pt Match each description on the right with the correct structure on the le±t. An individual structure can be used as an answer more than once and not all structures need be used as answers. A B C D E . cis -9-Octadecenate 2 A ± B ± C ± D ± E ± . released ±rom membrane phospholipids as a prostaglandin precursor 3 A ± B ± C ± D ± E ± . 18:1(Δ 9 ) 4 A ± B ± C ± D ± E ± . an omega-6 ( ω -6) ±atty acid 5 A ± B ± C ± D ± E ± . palmitoleate 6 A ± B ± C ± D ± E ± 2) D 3) B 4) D 5) B 6) E 2.5 pt What statement about sphingolipids is FALSE ? 7 . A ± All sphingolipids have a trans double bond. B ± All sphingolipids have a hydroxyl group on C3. C ± All sphingolipids have an amino group on C2. D ± All sphingolipids have a phosophodiester bond connecting C1 and the head group. 7) D false false false true
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CODE - AAAAAA - BMB462, Fall 2007 - Biochemistry II 2 Exam I 2.5 pt Which statement about the general properties of membranes is FALSE ? 8 . A ± Membranes are typically about 6 to 10 mm thick. B ± Membrane phospholipids have a roughly cylindrical pro±le (the cross sectional area of the head group and acyl side chains are similar). C ± Cholesterol is a membrane lipid found in the plasma membrane of mammals. D ± Phosphotidylcholine and phosphotidylserine are important components of mammalian membranes. E ± Membrane lipids are amphipathic. 8) A true false false false false Use this lipid to answer the next ±ve questions. 2.5 pt The lipid pictured above is best described as . 9 . A ± monogalactosyldiacylglycerol. B ± cardiolipin. C ± sphingomyelin. D ± phoshatidylethanolamine. E ± phosphatidylcholine. 2.5 pt Which phospholipase would be required to release arachidonate and initiate eicosanoid signaling? 10 . A ± phospholipase C B ± phospholipase A2 C ± digestive lipase D ± phospholipase A1 E ± phospholipase D 2.5 pt The cellular function of the lipid pictured above is best described as . 11 . A ± a membrane lipid B ± a thromboxane C ± a steroid hormone D ± energy storage E ± all of the above 2.5 pt Replacing the fatty acids in this lipid with a and a would DECREASE the melting point of this lipid. 12 . A ± 18:3(Δ 9,12,15 ) and 24:0 B ± 20:4(Δ 5,8,11,14 ) and 24:0 C ± 18:3(Δ 9,12,15 ) and 16:0 D ± 20:4(Δ 5,8,11,14 ) and 12:0 E ± 20:0 and 18:0
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CODE - AAAAAA - BMB462, Fall 2007 - Biochemistry II 3 Exam I 2.5 pt Predict which of the following lipids would likely elute from an absorption chromatography column AFTER the lipid seen here. The absorption chromatography column uses silica gel as the stationary phase and increasingly polar solvents as the mobile phase. 13
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This note was uploaded on 03/26/2008 for the course BMB 462 taught by Professor Staff during the Spring '08 term at Michigan State University.

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AAAAAA_with_Key - CODE - AAAAAA - BMB462, Fall 2007 -...

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