Exam02_2009-VanDemark_Key - Name_ Student# (not SS#) _...

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Name_________________________ Student# (not SS#) _________________________ Biological Sciences 1000--Biochemistry EXAM 2 – Part 1 (VanDemark) November 3, 2009 1. Read each question carefully. 2. Print your name on each page. 3. Write in ink only & write legibly. 4. Remember to sign the class list when you turn in your exam. 5. Use a sheet of blank paper (at rear of exam) to cover your answers as you work. Calculators are NOT allowed. Physical Constants that may or may not be helpful today. Boltzmann constant, k = 1.381 x 10 -23 J/K Avogadro’s number, N = 6.022 x 10 23 mol -1 Faraday’s constant, F = 96.48 kJ V -1 mol -1 Gas constant, R = 8.315 J/mol K 25 ° C = 298 K ln 10 = 2.3; log 10 = 1; log 1 = 0
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Multiple Choice Questions Please mark your selection for the best choice CLEARLY (2 points each). (This section is worth 28 points total.) 1. When two carbohydrates are epimers: A) one is a pyranose, the other a furanose. B) one is an aldose, the other a ketose. C) they differ in length by one carbon. D) they differ only in the configuration around one carbon atom. E) they rotate plane-polarized light in the same direction. 2. When the linear form of glucose cyclizes, the product is a(n): A) anhydride. B) glycoside. C) hemiacetal. D) lactone. E) oligosaccharide. 3. In glycoproteins, the carbohydrate moiety is always attached through the amino acid residues: A) asparagine, serine, or threonine. B) aspartate or glutamate. C) glutamine or arginine. D) glycine, alanine, or aspartate. E) tryptophan, aspartate, or cysteine. 4. Peripheral membrane proteins: A) are generally noncovalently bound to membrane lipids. B) are usually denatured when released from membranes. C) can be released from membranes only by treatment with detergent(s). D) may have functional units on both sides of the membrane. E) penetrate deeply into the lipid bilayer. 5. The shortest α helix segment in a protein that will span a membrane bilayer has about _____ amino acid residues. A)
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This note was uploaded on 04/03/2011 for the course BIOSCI 1000 taught by Professor Bledsoe during the Fall '08 term at Pittsburgh.

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Exam02_2009-VanDemark_Key - Name_ Student# (not SS#) _...

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