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Exam 2 (2007) - University of Houston BCHS 3304 Exam II...

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1 University of Houston BCHS 3304 Exam II Instructor Dr. Briggs Mar. 06, 2007 Printed Name___ANSWER KEY _______ LAST, FIRST Multiple choice, 2 pts each (100 pts) – Circle letter (i.e. a., b., c., d., or e.) of the most correct answer, then mark it on the Scantron sheet with a #2 pencil. Mark BOTH the exam AND the Scantron sheet. A Ramachandran plot can be found at the end of the exam. 1). Binding of oxygen to the heme in either myoglobin or hemoglobin requires: a). A heme-heme dimer complex. b). A iron liganded to a tyrosine. c). His F8 linked to the iron d). His E7 linked to the iron e). The iron in the +3 oxidation state 2). What is the N M nomenclature for an alpha helix? a). 2.2 7 b). 4.4 16 c). 3.6 13 d). 3 13 e). None of the above. 3). What percentage of CO 2 is transported by hemoglobin via formation of carbamates? This question is not worded clearly enough so answers “a” and “c” will be marked as correct. 4). What is the effect on hemoglobin at high altitudes when the 2,3-BPG concentration in the blood rises from 5 mM to 8 mM?
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2 5). The slope of the Hill plot for oxygen binding to hemoglobin changes and becomes greater than 1 as compared to the slope of the Hill plot for oxygen binding to myoglobin which is always 1: 6). What is the ionic strength, I, of a 9M solution of Ca 3 (PO 4 ) 2 ? a). 135 M b). 45 M c). 270 M d). 450 M e). 180 M I=0.5*Sum(c i *Z i 2 )=0.5*{[3*9M]*(2) 2 + [2*9M]*(-3) 2 }=0.5{108+162} = 135M 135M [Ca 2+ ] [PO 4 3- ] (These were inadvertantly given as 270, 90, 540, 900, and 360 M on the exam but I gave the correction, as above, on the board and announced it) 7). Calculate the length in angstroms of a 1024-residue segment of the α -keratin coiled-coil. 8). The φ dihedral angle of a peptide bond is described by rotation about the bond
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