BIOCHEM - 1ST YEAR COMPLETE QUESTIONS AND ANSWERS.

BIOCHEM - 1ST YEAR COMPLETE QUESTIONS AND ANSWERS. All mamino macids mcontain ma mcentral mcarbon, ma mside mchain m(R mgroup), man mamino mgroup mand ma m__________ mgroup. m- mcorrect manswers mCarboxyl Amino macids mcan mundergo ma mproton mtransfer, mthus mgiving mboth ma m(+) mand m(-) mcharge. mThis mmolecular mstate mis mcalled mthe m________. m- mcorrect manswers mZwitterion Amino macid mthat mare munable mto mbe msynthesised mfrom mbiochemical mpathways mwithin ma mcell mhave mto mbe mconsumed mthrough mdietary mintake. mThese mare mcalled m_______ mamino macids. m- mcorrect manswers mEssential When mtwo mamino macids mjoin mtogether, mthey mare mjoined mby man maide mbond. mThis mis malso mreferred mto mas ma m_______ mbond. m- mcorrect manswers mPeptide Which mlevel mof mprotein mstructure minvolves mthe mamino macid msequence, mbut mnot mthe mfolding mof mthe mprotein? m- mcorrect manswers mPrimary Unfolding ma mprotein musing mheat mis ma mprocess mcalled m________. mThis mprocess mdoes mnot maffect mthe mprimary msequence mof mthe mprotein. m- mcorrect manswers mDenaturation If ma mneutral mamino macid mis mplaced min ma mvery mbasic menvironment m(pH m m10), mit mwill mlose ma mproton m(H+) mfrom mthe m__________ mfunctional mgroup. m- mcorrect manswers mCarboxyl m- mCOOH Disulphides mbonds mare mcovalent mbonds mbetween mtwo m_______ mamino macids. m- mcorrect manswers mCysteine The mprocess mof mbreaking mthe mbonds mbetween mamino macids mwithin ma mpolypeptide mis mcalled ma m______ mreaction. m- mcorrect manswers mHydrolysis All mamino macids mcontain mboth man macidic mcarboxyl mgroup mand ma mbasic m______ mgroup. m- mcorrect manswers mAmino Amino macids mnever mexist min mnature mas mneutral mmolecules; mrather mthey mundergo ma mproton mtransfer mto mform ma m______. m- mcorrect manswers mZwitterion Humans mare munable mto mproduce m_____ mof mthe mamino macids mrequired, mand mtherefore mthey mare mreferred mto mas messential mamino macids. m- mcorrect manswers m10 If man mamino macid mis mplaced min ma mvery macidic menvironment m(pH m m2) mwhich mfunctional mgroup mgains ma mproton m(H)? m- mcorrect manswers mCarboxyl mgroup The mamino macid mat mthe m"ends" mof mthe mpeptide mcan mbe meither ma mN-terminal mamino macid mor ma m________ mamino macid. m- mcorrect manswers mC-terminal Which mlevel mof mprotein mstructure mdescribes mthe m3D marrangement mof mlocalised mregions? m- mcorrect manswers mSecondary mstructure Each mturn min man malpha mhelix mcontains m____ m(number) mamino macid mresidues. m- mcorrect manswers m3.6 Some menzymes, msuch mas mpepsin, mbreak mdown mpolypeptides mby m______. m- mcorrect manswers mHydrolysis Various mprocesses, mincluding mheating, mcan machieve mdisruption mof msecondary, mtertiary, mand meven mquaternary mprotein mstructure. mThis mtype mof mchange min ma mproteins mshape mis mtermed m______ m. m- mcorrect manswers mDenaturation There mare m_____ mamino macids mthat mhumans mmust mobtain mfrom mdiet mand mcan't mproduce. m- mcorrect manswers m10 All mamino macids mcontain mthe macidic m_____ mgroup mand ma mbasic mamino mgroup m- mcorrect manswers mCarboxyl Amino macids mnever mexist min mnature mas mneutral mmolecules; mthey mundergo ma m______ mtransfer mto mfrom ma mzwitterion. m- mcorrect manswers mProton In mthe mFischer mprojections mwhen mL mand mD misomers mcan mbe midentified mby mthe mposition mof mNH3+ mgroup, m_____ misomers mare mconsidered mcommon mnaturally moccurring mamino macids. m- mcorrect manswers mL misomers If man mamino macid mis mplaced min man menvironment mwith mpH maround m6, mthey mwill mexist min mtheir m______ mform. m- mcorrect manswers mZwitterion Which mstructure mof mprotein mshows mthe msequence mof mamino macids mthat mform mthe mprotein? m- mcorrect manswers mPrimary ______ mbonds mare mcovalent mbonds mthat mhelp mstabilise mthe mtertiary mstructure mof mprotein. m- mcorrect manswers mDisulfide The mfirst mstep min mdigestion mof mprotein minvolves msome menzymes msuch mas mpepsin min ma mprocess mcalled m______. m- mcorrect manswers mHydrolysis Some menzymes mrequire man madditional mmolecule mto mbe mpresent min morder mfor mthe mreaction mto mtake mplace. mThis madditional mmolecule mis mcalled ma m________. m- mcorrect manswers mCo-factor Enzymes mthat mare mhighly mspecific mfor ma msingle msubstrate mare mbest mdescribed mas mthe m_______ mmodel mof menzyme/substrate minteraction? m- mcorrect manswers mLock-and-key Which mgroup mof menzymes mdo mreductases mbelong mto? m- mcorrect manswers mOxidoreductases The mtransfer mof ma mphosphate mgroup mto ma mmolecule mis mcatalyzed mby mwhich mclass mof menzyme? m- mcorrect manswers mKinase Which menzyme mcontrol mis mcharacterised mby mthe mbinding mof ma mregulator mmolecule mto mthe menzyme mcausing ma mconformational mchange mthat mincreases mthe mability mof mthe mactive msite mto mbind msubstrate. m- mcorrect manswers mPositive mallosteric mcontrol Does ma mcompetitive minhibitor mbind mto mthe mactive msite mof mthe mtarget menzyme? m- mcorrect manswers mYes Is mnoncompetitive minhibition ma mform mof mreversible mor mirreversible minhibition? m- mcorrect manswers mForm mof mreversible minhibition Pepsinogen mis man mexample mof man menzyme mthat mis mproduced min mits minactive mform mand mlater mundergoes mmodification mto mmake mit mactive. mThese mtypes mof minactive mprecursors mof menzymes mare mcalled m______. m- mcorrect manswers mZymogen Enzymes mperform mthe mrole mof m_______? m- mcorrect manswers mBiological mcatalysts What mis mthe mclassification mof menzymes mthat mcleve mbonds mwith mwater? m- mcorrect manswers mHydrolases Which mgroup mof menzyme mcan mbe msaid mto mcreate mbonds maccompanied mby menergy mrelease mfrom ma mhydrolysis mreaction? m- mcorrect manswers mLigases What mfunctional mgroup mdo mkinase menzymes mtransfer? m- mcorrect manswers mPhosphate mgroup Which mtype mof menzyme mcontrol mis mcharacterised mby mthe mbinding mof ma mregulator mmolecule mto mthe menzyme mcausing ma mconformational mchange mthat mdecreases mthe mability mof mthe mactive msite mto mbind msubstrate? m- mcorrect manswers mNegative mallosteric mcontrol Does ma mnon-competitive minhibitor mbind mto mthe mactive msite mof mthe mtarget menzyme? m- mcorrect manswers mDoesn't mbind mto mactive msite Enzymes mthat mcatalyse mthe maddition mor mremoval mof ma mmolecule mto mcreate mor mremove ma mdouble mbond mare mclassified mas m_____? m- mcorrect manswers mLyases Enzymes mthat mcatalyse mbond mformation maccompanied mby menergy mrelease mfrom ma mhydrolysis mreaction mare mclassified mas m_____ m? m- mcorrect manswers mLigases Enzymes mthat mcan mact mon ma mwide mrange mof msubstrates mand mcan madjust mto mthe mshape mof msubstrate mare mexplained mby mthe m_____ mmodel mof menzyme/substrate minteraction. m- mcorrect manswers mInduced-fit The mtemperature mthat menzymes moften mhave mtheir mmaximum mreaction mrate mis maround m______? m- mcorrect manswers m37 mc ______ mcontrol mis mcharacterised mby mthe mbinding mof ma mregulator mmolecule mto mthe menzyme mcausing ma mconformational mchange mthat mdecreases mthe mability mof mthe mactive msite mto mbind msubstrate. m- mcorrect manswers mNegative mallosteric mcontrol _____ mbind mand mstop mthe menzyme mwhich mpermanently mstop mits mactivity. m- mcorrect manswers mIrreversible minhibitor A mnucleoside mis mcomposed mof ma mmonosaccharide mand ma m______ m- mcorrect manswers mNitrogen mcontaining mbase Which mgroup mof mnitrogen-containing mbases mis mknown mfor mtheir m1-ring mstructure? m- mcorrect manswers mPyrimidine What mis mthe mfull mname mof mthe mmonosaccharide mfound min mRNA? m- mcorrect manswers mD-ribose True/False m- mSteroids mand mphospholipids mare mnot mable mto mbe mbroken mdown minto msmaller mcomponents mvia mhydrolysis. m- mcorrect manswers mFalse How mmany mnucleotides mare mused min mRNA? m- mcorrect manswers mFour What mtype mof mreceptor mis mthe mnicotinic macetylcholine mreceptor? m- mcorrect manswers mIon mchannel What moccurs mwhen macetylcholine mbinds mto mthe mnicotinic macetylcholine mreceptor? m- mcorrect manswers mOpening mof mthe mchannel mand mrelease mof mions What mis mthe mterm mused mto mdescribe mthe mfact mthere mare mmultiple mcodons mencoding mfor mthe msame mamino macid? m- mcorrect manswers mRedundancy dAMP mis man mabbreviation mfor mwhich mnucleotide? m- mcorrect manswers mDeoxyadenosine m5' mmonophosphate