2024 Specimen Paper Answers (ThatBioTutor).docx

Credit:WrittenbythecollectiveeffortofourtutorsatThatBioTutor.Youarewelcometosharethesewithanyoneyou’dlike!Justdon’tsellthemforprofit:) SpecimenPaper2024(ThatBioTutorEdition) Question Ans Question Ans1 D 21 D2 B 22 C3 A 23 A4 B 24 B5 D 25 C6 C 26 B7 B 27 B8 B 28 D9 B 29 D10 C 30 C11 C 31 C12 A 32 B13 D 33 A14 D 34 C15 B 35 B16 D 36 A17 A 37 C18 A 38 C19 D 39 A20 A 40 B NeedpersonalisedguidanceforOLevelPureBio?Learnmorehere:www.thatbiotutor.comFormoretips:www.youtube.com/@thatbiotutor

Credit:WrittenbythecollectiveeffortofourtutorsatThatBioTutor.Youarewelcometosharethesewithanyoneyou’dlike!Justdon’tsellthemforprofit:) Q1. ai)Protease aii)● Thestomachhasahighlyacidicenvironment, duetopresenceofhydrochloricacid,whichisatpH2,theoptimumpHfortheproteaseinthestomach,● whilethesmallintestinehasaslightlyalkalineenvironmentduetohigherpHofbileandpancreaticjuiceandintestinaljuice. bi)Liverandmusclecells. bii)Glycogen c) ● Deaminationoccursattheliver, whereaminogroupsareremovedfromexcessaminoacidsandconvertedintourea.● Urealeavestheliverviathehepaticvein, entersakidneyviatherenalartery, whereitisforcedoutalongwithmostofthebloodplasmaduringultrafiltrationfromglomerulusintotheBowman’scapsule.● Ureatravelsthroughtheproximalconvolutedtubule,loopofHenle,distalconvolutedtubule,collectingduct.● Itistransportedinurinetothebladderviaaureter, thenexcretedwhenurineleavesthebodyviatheurethra. NeedpersonalisedguidanceforOLevelPureBio?Learnmorehere:www.thatbiotutor.comFormoretips:www.youtube.com/@thatbiotutor

Credit:WrittenbythecollectiveeffortofourtutorsatThatBioTutor.Youarewelcometosharethesewithanyoneyou’dlike!Justdon’tsellthemforprofit:)Q2.ai)● Thenetmovementofparticlesfromaregionofhigherconcentrationtoaregionoflowerconcentration,● downaconcentrationgradient. aii)● Thereisahigherconcentrationofoxygeninthealveolarairspacethaninthebloodcapillarieswhichcarrydeoxygenatedblood,creatingaconcentrationgradient. aiii)● Deoxygenatedbloodfromthebodyflowsintotherightatrium, thenpastthetricuspidvalveintotherightventricle.● Itispumpedoutofthepulmonaryarterytothelungs,whichbranchesintocapillariessurroundingalveoli.● Oxygenatedbloodthenreturnstotheheartviathepulmonaryvein, enteringtheleftatrium. bi)● Theloweroxygenconcentrationintheairwouldleadtoagentlerconcentrationgradientbetweenairinthealveoliairspaceandthebloodplasma,● Diffusionrateofoxygendecreases,hencetherewouldbereducedoxygenuptakefromthealveoliintotheblood. bii)● Moreredbloodcellswouldincreasetheratethatoxygencanbetransportedfromlungstomuscles,● somusclescanundergohigherratesofaerobicrespiration, releasingmoreenergyformuscularcontractions, allowingathletestosustainlongerperiodsofintenseactivitywithlessfatigue, enhancingtheirperformance. NeedpersonalisedguidanceforOLevelPureBio?Learnmorehere:www.thatbiotutor.comFormoretips:www.youtube.com/@thatbiotutor

Credit:WrittenbythecollectiveeffortofourtutorsatThatBioTutor.Youarewelcometosharethesewithanyoneyou’dlike!Justdon’tsellthemforprofit:)Q3. ai)(Chooseanyoneoftheshapes) aii)(Choo