Exam_2-04_key - HO-CH2-CH=CH(CH2)12-CH3|CH-NH-C-stearic...

Unformatted text preview: HO-CH2-CH=CH-(CH2)12-CH3|CH-NH-C-stearic acid|CH2-O-P-O-cholineOOBMB 401-March 5, 2004- Exam 2. 100 points; 4 points per question; one answer per question.Kuo section1. Select the correct statement.a.Cyclization of glucose results from the reaction between C1 and one of the hydroxyl groups within the backbone.b.Xylulose is a aldopentose.c.Cyclization of fructose is an irreversible process resulting in a non-reducing end.d.Glucose and galactose are enatiomers.2. Select the WRONG structure of disaccharides.a.Lactose: galactose-¡-1,4-glucoseb.Sucrose: glucose-¡-1,2-fructosec.Maltose: glucose-¡-1,4-glucosed.Cellobiose: glucose-¢-1,4-glucose3. Select the correct statement about the polysaccharides.a.Chitin is made of N-acetylglucosamine joined by ¡-glycosidic bonds.b.Glycogen is the main structural polysaccharides of animal livers.c.Glucose ¡(1-->6) linkages create the branching points of amylopectin.d.Cellulose is one of the main energy storage polymers of plants.4. Which of the following is linoleic acid [18:2 (9,12)]?a.C-C-C-C-C-C-C-C-C-C=C=C=C-C-C-C-C-COOHb.C-C-C-C-C-C-C-C-C=C-C-C=C-C-C-C-C-COOHc.C-C-C-C-C-C=C-C-C=C-C-C-C-C-C-C-C-C-COOHd.C-C-C-C-C-C=C-C-C=C-C-C-C-C-C-C-C-COOH5. Which of the following names best describes the structure shown below?a.Phosphotidylcholineb.Sphingomyelinec.Cholesterold.Glycosphingolipid6. Which of the following description is WRONG?a.Bile acids are critical for absorbing lipids by intestine.b.Androgen and estrogen are essential for sexual development and functions.c.Mineraldocorticoids are important for carbohydrate and lipid metabolism.d.Cholesterol is the common precursor for all steroids.7. Select the WRONG statement.a.Peripheral membrane proteins can be extracted without disrupting the membrane bilayer structure.b.Glycosyl phosphatidylinositol is usually conjugated via N-linked bonds involving the ¡-amino groups.c.Fatty acids can be attached to proteins via thioester bonds to anchor the conjugated proteins to the membrane....
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