Exam_2-03_key - BMB 401 Exam 2 Kuo Section: 4 points each....

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BMB 401 Exam 2 Kuo Section: 4 points each. Total of THIS part = 32 points. 1. Which of the following is a ketopentose? a. ribose b. glucose c. fructose d. ribulose 2. Select the correct statement regarding sugar cyclization. a. Aldohexoses tend to cyclize to form furanoses b. The predominant form of cyclic glucose results from the reaction between C5-hydorxyl and C1-carbonyl oxygen. c. The anomeric carbon refers to C6 of glucose that is not part of the cyclic ring. d. Cyclization of glucose is irreversible. 3. Choose the correct statement regarding disaccharides. a. Maltose is composed of two D-glucose molecules joined via the -(1,4) glycosidic bond. b. Lactose is formed between two molecules of D-galactose. c. Fructose is composed of one molecule of D-glucose and one molecule of L-fructose. d. Cellobiose has two D-glucose molecules joined via an α -(1,6) glycosidic bond. 4. Choose the correct statement regarding polysaccharides. a. Chitin is made of repetitive unit of D-glucose. b. Cellulose is broken down to maltose by carnivores. c. The alpha linkage between the glucose subunit of starch makes the starch molecules adapt a helix structure in solution. d. The branching point of glycogen has a β -(1,6) glycosidic bond. 5. Select the correct statement about fatty acids. a. Saturated fatty acids contain C=C double bonds. b. The head group of a fatty acid is usually buried in a hydrophobic environment. c. The C=C double bonds in natural fatty acids are usually in a cis-conformation. d. Free fatty acids are frequently found in animal adipose tissues. 6. Select the WRONG statement. a. Phosphotidylcholine is one of the most abundant phospholipid in biological membrane. b. Phosphotidic acid contains a phosphate group at the C3 position of diacylglycerols.
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c. Phosphotidylethanolamine is a major precursor for second messengers such as diacylglycerol in signal transduction. d. Some snake venom contains phospholipase that attack the fatty acid moiety of glycerophospholipids in cell membrane. 7. Select the correct statement regarding sphingolipids. a. Niemann-Picks disease results from a super active sphingomyelinase mutant that wipes out sphingomyelin molecules at the nervous system. b. A fatty acid forms an amide linkage with the C2 nitrogen of sphingosine to form ceramide. c. Glycosphingolipids contain one or more sugar in alpha-glycosidic linkage to the C1 hydroxyl of ceramide. d.
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Exam_2-03_key - BMB 401 Exam 2 Kuo Section: 4 points each....

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