BCH 361 Exam 1 Questions And
Answers
___rconformationrisralwaysrfavoredrduertorlackrofrstericrclashesr-rCORRECTrrANSWER-
trans
___rforrliferarerencodedrinrnucleicracidr-rCORRECTrrANSWER-instructions
___risrbyrfarrthermostrabundantrelementr(byrmass)rafterrtakingroutrwater,rfollowedrbyr____r-
rCORRECTrrANSWER-C
N,O,H
3Drstructurer-rCORRECTrrANSWER-aminoracidrsequencerdeterminesr____
acidr-rCORRECTrrANSWER-protonrdonor
alpharCrandrCrbondrrotationr-rCORRECTrrANSWER-ψr(psi)
alpharhelixr-rCORRECTrrANSWER-backbonerfoldsrintorhelicalrconformationr
ψr=r-60
φr=r-70rtor-100
alpha-CrandrNrbondrrotationr-rCORRECTrrANSWER-φr(phi)
alpha-keratinrisrcomposedrofr-rCORRECTrrANSWER-tworright-
handedralpharhelicesr(stabilizedrbyrintra-strandrH-bond)rintertwinedrtorformrarleft-
handedrsuperrhelixrcalledrarcoiled-coil
alpha-keratinrisrfoundrinr-rCORRECTrrANSWER-
foundrinrwool,rhair,rnail,rhorn,rfeather,randrepithelialrcells
aminoracidrsequencerofrcollagenr-rCORRECTrrANSWER-everyrthirdrresiduerisrglyciner
prolinerandrhydroxyprolinerarerabundant
, AnfinsenrPrincipler-rCORRECTrrANSWER-
ther3Drconformationradoptedrbyrtherproteinrisrlargelyrdecidedrbyrtherproteinsraminoracidrseq
uence
AnfinsenrPrincipler-rdenaturedrproteinsr-rCORRECTrrANSWER-
canrretainractivityrafterrarfewrdaysratrpHr7.4
anti-parallelrbetarsheetsr-rCORRECTrrANSWER-
neighboringrstrandsrhaverdifferentrorientationr
(h-bondrlinesrarerparallel)
Atomicrcompositionrofrorganismsr-rmajorityrconsistsrofrfourrtypesrofratomsr-
rCORRECTrrANSWER-hydrogen,roxygen,rcarbon,rnitrogen
backbonerofrpeptidesr-rCORRECTrrANSWER-N,ralpha-
C,rCrfromreachraminoracidrtorformrlinearrchain
baser-rCORRECTrrANSWER-protonracceptor
Beta-sheetsr-rCORRECTrrANSWER-formedrbyradjacentrBeta-
strandsrlyingrnextrtoroneranotherrthroughrhydrogenrbondsr
siderchainsrarerplacedraboverorrbelowr
Φ=-70rtor-100
ψ=90rtor110
buffersr-rCORRECTrrANSWER-compoundsrwhoserpKarisrclosertordesiredrpH
stabilizerpHrbyrconvertingrconjugaterbasertorconjugateracidr(orrvicerversa)
c-terminusr-rCORRECTrrANSWER-freercarboxylrgroup
Carbohydrates,rlipids,rproteins,randrnucleicracidsr-rCORRECTrrANSWER-
moleculesrseenrinrallrorganisms
cellrmembraner-rCORRECTrrANSWER-
separatesrthercellrcontentsrfromrtheroutsiderworld;rcontentsrincluderorganellesr(heldrinrplac
erbyrthercytoskeleton)randrthercytosol
cellrwallr-rCORRECTrrANSWER-rigidrexteriorrlayerrofrplantrcells
centralrvacuoler-rCORRECTrrANSWER-membrane-enclosedrsacrinrplantrcells
Chloroplastr-rCORRECTrrANSWER-
Siterofrphotosynthesisrinrgreenrplantsrandralgae;rhasritsrownrDNA
collagenrbondingr-rCORRECTrrANSWER-hydrogenrbondrisrabsentrwithinrtherchainr
withinrallrthreerchains,rglycinercanrfitrinrtherinteriorrandrformrinterchainrhydrogenrbonds
Answers
___rconformationrisralwaysrfavoredrduertorlackrofrstericrclashesr-rCORRECTrrANSWER-
trans
___rforrliferarerencodedrinrnucleicracidr-rCORRECTrrANSWER-instructions
___risrbyrfarrthermostrabundantrelementr(byrmass)rafterrtakingroutrwater,rfollowedrbyr____r-
rCORRECTrrANSWER-C
N,O,H
3Drstructurer-rCORRECTrrANSWER-aminoracidrsequencerdeterminesr____
acidr-rCORRECTrrANSWER-protonrdonor
alpharCrandrCrbondrrotationr-rCORRECTrrANSWER-ψr(psi)
alpharhelixr-rCORRECTrrANSWER-backbonerfoldsrintorhelicalrconformationr
ψr=r-60
φr=r-70rtor-100
alpha-CrandrNrbondrrotationr-rCORRECTrrANSWER-φr(phi)
alpha-keratinrisrcomposedrofr-rCORRECTrrANSWER-tworright-
handedralpharhelicesr(stabilizedrbyrintra-strandrH-bond)rintertwinedrtorformrarleft-
handedrsuperrhelixrcalledrarcoiled-coil
alpha-keratinrisrfoundrinr-rCORRECTrrANSWER-
foundrinrwool,rhair,rnail,rhorn,rfeather,randrepithelialrcells
aminoracidrsequencerofrcollagenr-rCORRECTrrANSWER-everyrthirdrresiduerisrglyciner
prolinerandrhydroxyprolinerarerabundant
, AnfinsenrPrincipler-rCORRECTrrANSWER-
ther3Drconformationradoptedrbyrtherproteinrisrlargelyrdecidedrbyrtherproteinsraminoracidrseq
uence
AnfinsenrPrincipler-rdenaturedrproteinsr-rCORRECTrrANSWER-
canrretainractivityrafterrarfewrdaysratrpHr7.4
anti-parallelrbetarsheetsr-rCORRECTrrANSWER-
neighboringrstrandsrhaverdifferentrorientationr
(h-bondrlinesrarerparallel)
Atomicrcompositionrofrorganismsr-rmajorityrconsistsrofrfourrtypesrofratomsr-
rCORRECTrrANSWER-hydrogen,roxygen,rcarbon,rnitrogen
backbonerofrpeptidesr-rCORRECTrrANSWER-N,ralpha-
C,rCrfromreachraminoracidrtorformrlinearrchain
baser-rCORRECTrrANSWER-protonracceptor
Beta-sheetsr-rCORRECTrrANSWER-formedrbyradjacentrBeta-
strandsrlyingrnextrtoroneranotherrthroughrhydrogenrbondsr
siderchainsrarerplacedraboverorrbelowr
Φ=-70rtor-100
ψ=90rtor110
buffersr-rCORRECTrrANSWER-compoundsrwhoserpKarisrclosertordesiredrpH
stabilizerpHrbyrconvertingrconjugaterbasertorconjugateracidr(orrvicerversa)
c-terminusr-rCORRECTrrANSWER-freercarboxylrgroup
Carbohydrates,rlipids,rproteins,randrnucleicracidsr-rCORRECTrrANSWER-
moleculesrseenrinrallrorganisms
cellrmembraner-rCORRECTrrANSWER-
separatesrthercellrcontentsrfromrtheroutsiderworld;rcontentsrincluderorganellesr(heldrinrplac
erbyrthercytoskeleton)randrthercytosol
cellrwallr-rCORRECTrrANSWER-rigidrexteriorrlayerrofrplantrcells
centralrvacuoler-rCORRECTrrANSWER-membrane-enclosedrsacrinrplantrcells
Chloroplastr-rCORRECTrrANSWER-
Siterofrphotosynthesisrinrgreenrplantsrandralgae;rhasritsrownrDNA
collagenrbondingr-rCORRECTrrANSWER-hydrogenrbondrisrabsentrwithinrtherchainr
withinrallrthreerchains,rglycinercanrfitrinrtherinteriorrandrformrinterchainrhydrogenrbonds
