Exam 2 (2008)

Exam 2 (2008) - -: Exam I Universify of Houston BCHS 3304...

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--: I Universify of Houston BCHS 3304 Exam II Instructor Dr. Briggs Mar. 04,2008 Printed Name DrA O . +, Al 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. l). In a protein, the most conformationally restricted amino acid is _; the least conformationally restricted is -. a). Trp, Gly b). Met, Cvs fD. Pro. ctv Yl. n..-en .j. Alu. p.o 2). What is the Ny nomenclarure for alf;)relix? al.2.2, V [T]. 4.4,^ \-(. ^ - -" ( Ch J.6tz v d).3rs e). None ofthe above. .,,', \# I Nsi( 6ei5 ;" 3). About 5o/o of the CO2 produced during respiration forms carbamates via N-termini of hemoglobin chains. ' What percentage of the total CO2 exchanged in the lungs is from transport by hemoglobin via formation of carbamates? a). jVo b\.2s% ,0) 50% YI lsy, e). 100% 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? a). More CO2 is released. b). The concentration ofglucose increases. c). More hemoglobin is degraded. @ tvtore oxygen is released. e). The myoglobin concentrations are low. l.i:,iil,, ffi liiri t (J '; t ls*____*_*_ , _1 ' a,r.r; lr ErgG"f
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't--t I t l 5). Which of the following is not true about enz).'rnes? +,h, u$-{ s{. @ nnrymes catalyzethe reaction in only tle forward direction. b). Enrymes are often very specific for their substrates. c). Enzyme activities can often be regulated. d). Enzymes typically act under milder conditions of temperature and pH than chemical catalysts. e). Enzymes typically catalyze reactions at much higher rates than chemical catalysts. 6). What is the ionic strength, I, of a 9M solution of (NH+)zSO+ ? { lfio),qq i \'<{t\ g. 13.s M /bD27 M 11. +stvt d).54M e). 90M -T- 7,' g r"t zl.i&f; - {aM Y 3M Z G,f) = b; l_E 2 t{ I e\ 7). Calculate the length a). s01 A b). 71oA 1c) tzo A '{7. lsz A e). 1002 A in angstroms of a 50l-residue segment of the cr-keratin coiled-coil. r*t.t *[t)L r gM bol r.es;J.r* k ' 1-*'L ,. F,i, eu -_ b,5 y*Jrlp.* / *,+*., t8 t)6 710 , oLL t, l, : a:24 2 U fi 8). The $ dihedral angle of a peptide bond is described by rotation about the bond a). that is between the N and C atoms. /iar ., ( bl\that is between the Ccx and N atoms. c). that is between the Ca and C atoms. f d). that is between the Co and CB atoms. e). none ofthe above. 9). The ry dihedral angle of a peptide bond is described by rotation about the bond a). that is between the N and C atoms. b). that is between the Ccr and N atoms. 4h tnat is between the Ccr and C atoms. \f tnat is between the Ccr and CB atoms. .j.
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Exam 2 (2008) - -: Exam I Universify of Houston BCHS 3304...

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