AQA A LEVEL BIOLOGY REVISION TESTS WITH ALL ANSWERS.

AQA A LEVEL BIOLOGY REVISION v v v v




TESTS WITH ALL ANSWERS v v v v




Describe nhow nyou nwould nuse na nbiochemical ntest nto nshow nthat na nsolution
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ncontained na nnon-reducing nsugar, nsuch nas nsucrose. n[3] n- n ncorrect nanswer-,first
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nreducing nsugars ntest; nboil nwith ndilute nHCl nacid nthen nNeutralise nwith nNaHCǑ,
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nadd nbenedict nand nheat nto n95 ndegrees nC nbrick nred nppt nforms nif nreducing nsugar
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nis npresent
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Describe na nchemical ntest nyou ncould ncarry nout nto nshow nthat na npiece nof ncoconut
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ncontains nlipids. n[3] n- n ncorrect nanswer-(Crush nin) nethanol n/ nalcohol; nAdd n(to)
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nwater n(Order nof nadding nis ncritical nfor nthis npoint); nEmulsion n/ nwhite ncolour
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Explain nwhat nis nmeant nby na npolymer. n[1] n- n ncorrect nanswer-Molecule) nmade nup
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nof nmany nidentical/similar nmolecules/monomers/ nsubunits;
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Name nthe nreaction nwhich noccurs nwhen nstarch nis nbroken ndown ninto nmaltose. n[1]
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n- n ncorrect nanswer-Hydrolysis
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What nis nthe nformula nfor nlactose? n[2] n- n ncorrect nanswer-C12 n; nH22Ō1
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Describe nhow nβ-glucose nmolecule ndiffers nfrom na nmolecule nof nα-glucose. n[1] n- n
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ncorrect nanswer-H nat ntop nright nend n(instead nof nOH) n/ nOH nat nbottom n(carbon n1)
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Show ntwo nways nin nwhich nthe nstructure nof ncellulose nis ndifferent nfrom nthe
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nstructure nof nstarch. n[2] n- n ncorrect nanswer-Starch n1,4 nand n1,6 nbonds n/ nbranching
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nCellulose n1,4 nbonds n/ nno n1,6 nbonds n/ nstraight; nstarch nAll nglucoses n/monomers
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nsame nway nup ncellulose nAlternate nglucoses nupside ndown; nstarch nHelix n/
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ncoiled/compact ncellulose nStraight; nStarch nmonomer nAlpha nglucose nCellulose
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nmonomer nBeta nglucose
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, Describe nthe nstructure nof nstarch nand nexplain nhow nits nstructure nis nrelated nto nits
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nfunction. n[3] n- n ncorrect nanswer-Formed nfrom nα nglucose; nJoined nby
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ncondensation/ nby nthe nremoval nof na nwater nmolecule/ nglycosidic nbonds; nBetween
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n(carbons) n1 nand n4 n(and n1 nand n6); nCoiled nchain; ncompact; n(Allows) nstorage nof
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nlarge namount nin na nsmall nspace; nInsoluble nso nhas nno neffect non nosmosis/water
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npotential; nBranches; n(Allows) nrapid nbreakdown/release nof nglucose n/ nhydrolysis;
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The nstructure nof na nphospholipid nmolecule nis ndifferent nfrom nthat nof na ntriglyceride.
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nDescribe nhow. n[2] n- n ncorrect nanswer-triglyceride nhas nthree nfatty nacids nand
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nphospholipid nhas ntwo; nno nphosphate ngroup npresent nin ntriglyceride nbut npresent
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nin nphospholipid.
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What nis nan nunsaturated nfatty nacid? n[1] n- n ncorrect nanswer-Some n/ ntwo ncarbons
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nwith nonly none nhydrogen n/ n(double nbonds) nbetween ncarbon natoms n/ nnot
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nsaturated nwith nhydrogen;
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Describe nthe nstructure nof ncellulose nand nexplain nhow nits nstructure nis nrelated nto
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nits nfunction. n[3] n- n ncorrect nanswer-Alternate nβ-glucose nrotated n180o, nlong
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nstraight nchains, nMany nhydrogen nbonds njoin n(polysaccharide) nchains/molecules
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nto neach nother n/ nmakes nmicrofibrils n/ ngives ntensile nstrength;
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Which nelements nare nfound nin nproteins? n[1] n- n ncorrect nanswer-Carbon, nhydrogen,
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noxygen, nnitrogen n(sometimes nsulphur)
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Describe nhow nyou nwould nuse na nbiochemical ntest nto nshow nthat na nsolution
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ncontained nprotein. n[2] n- n ncorrect nanswer-Biuret n/ nalkali n+ ncopper nsulphate;
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nLilac/purple/mauve/violet;
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Which nbonds nare nfound nin na)Primary nstructure n[1]b)Secondary nstructure n[1]
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nc)Tertiary nstructure n[2] n- n ncorrect nanswer-a)Peptide nb) nHydrogen n(and npeptide)
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nc)Ionic, ndisulphide nbridges, nhydrophobic ninteractions n(hydrogen nand npeptide)
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Explain nhow na nchange nin nthe nprimary nstructure nof na nglobular nprotein nmay nresult
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nin na ndifferent nthree-dimensional nstructure. n[3] n- n ncorrect nanswer-Sequence nof
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namino nacids nchanges; ntertiary nstructure nchanges/folds nin na ndifferent nway; nbonds
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nform nin ndifferent nplaces n(not npeptide);
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Describe nhow ntwo-way nchromatography nis ncarried nout. n[2] n- n ncorrect nanswer-Run
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nchromatogram nthen nturn nthrough n90/right nangle; nWith na ndifferent nsolvent;
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Explain nthe nadvantage nof nusing ntwo-way nchromatography nto nseparate nshort
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npolypeptides. n[2] n- n ncorrect nanswer-Spreads nspots/polypeptides nout nmore/ nmake
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nsure nspot nonly ncontains none nsubstance;
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Explain nhow ninhibitors naffect nthe nrate nof nenzyme-controlled nreactions. n[6] n- n
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ncorrect nanswer-Statement nabout ntwo ntypes, ncompetitive nand nnon-competitive;
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nCompetitive: nSimilar nshape nto nsubstrate;Inhibitor ncan nenter/bind nwith nactive nsite
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n(of nenzyme);Non-competitive: nAffect/bind nto nenzyme nother nthan nat nactive nsite;
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