Final_Practice_Exam_ans

Final_Practice_Exam_ans - Spring 2004 BCHS 3304 Final Exam...

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Spring 2004 BCHS 3304 Final Exam Review- 1). The T R transition of hemoglobin upon binding of oxygen to the heme has been thoroughly investigated. On a thermodynamic level, this T R transition can be described as (primarily) an enthalpically driven process. Which of the following phenomena in the T R transition of hemoglobin is the likely enthalpic driving force? a). Movement of the heme iron into the plane of the heme upon oxygen binding. b). The binding of oxygen by the distal histidine (E7). c). The exclusion of water from the oxygen-binding pocket. d). The breaking of pre-existing and making of new C-terminal salt bridges at the α / β interfaces. e). The occlusion of the heme pocket by valine (E11). : (d), the breaking of pre-existing and making of new C-terminal salt bridges at the α / β interfaces is the enthalpic driving force for the T R transition in hemoglobin. 2). At a pH more acidic than its isoelectric point, a protein will carry: a). no ionic charge b). a net positive charge c). a net negative charge d). a positive charge equal to the negative charge e). I have no clue, where am I, who are all of these people (b), at a pH more acidic than its isoelectric point, a protein will carry a net positive charge. 3). Match the following protein with its appropriate characteristic. a). Collagen I). 2 right-handed α -helices forming a left-handed b). Chymotrypsin coiled structure (c) c). α -Keratin II). Left-handed proline helices (a) d). RNase A III). oxonium intermediate (g) e). Silk Fibroin IV). catalyzes 2 ADP  AMP + ATP (j) f). Creatine Kinase V).stabilizes collagen structure using ascorbic g). Lysozyme acid (h) h). Prolyl Hydroxylase VI). catalytic triad (b) i) Carbonic Anhydrase VII). pair of catalytic histidine residues (d) j). Adenylate Kinase VIII). solubilizes CO 2 as bicarbonate anion (i) k). IgG Antibody IX). antiparallel β -sheet structure comprised of primarily small, aliphatic residues (e) X). maintains the muscle “energy reserve” (f) XI). Sandwiched β -sheet structure with high-affinity ligand binding loops. (k)
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4). Which of the following statements accurately describes the nature of a biologically active protein? a). A biologically active protein is composed of a branching sequence of amphoteric, L-amino acids joined together by resonant amide bonds between neighboring residues, each exhibiting free rotation. b). A biologically active protein is composed of a non-branching sequence of amphipathic, D- amino acids joined together by resonant amide bonds between neighboring residues, with each exhibiting no free rotation. c). A biologically active protein is composed of a non-branching sequence of amphoteric, L-amino acids joined together by resonant amide bonds between neighboring residues, with each exhibiting no free rotation. d). A biologically active protein is composed of a branching sequence of amphipathic, D-amino
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This note was uploaded on 10/07/2010 for the course BCHS BCHS 3304 taught by Professor Legge during the Spring '09 term at University of Houston.

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Final_Practice_Exam_ans - Spring 2004 BCHS 3304 Final Exam...

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