2019 TYS Answers (ThatBioTutor).docx

Credit:WrittenbythecollectiveeffortofourtutorsatThatBioTutor. Youarewelcometosharethesewithanyoneyou’dlike!Justdon’tsellthemforprofit:) TYSAnswers2019(ThatBioTutorEdition) IMPTNOTE:- Fordifferencesbetween2023and2024syllabus,seethislisthere.- *Shadedblack=outofsyllabusfrom2024onwards Question Ans Question Ans1 B 21 C2 D 22 D3 C 23 B4 B 24 D5 D 25 D6 B 26* A7 B 27 D8 C 28 D9 B 29 A10 A 30 A11 D 31 C12 B 32* C13 B 33* A14 C 34 D15 D 35 D16 A 36 D17 C 37 D18* C 38 A19 C 39 B20 D 40* C Stillwantmore?www.thatbiotutor.com- www.instagram.com/thatbiotutor/-www.youtube.com/@thatbiotutor- www.tiktok.com/@thatbiotutor

Credit:WrittenbythecollectiveeffortofourtutorsatThatBioTutor. Youarewelcometosharethesewithanyoneyou’dlike!Justdon’tsellthemforprofit:) Q1.(a)(i) ● Aistheplasmamembrane.● Itispartiallypermeableandregulatesthemovementofsubstancesinandoutofthecell. (ii)● BisaribosomethatisstuddedontheRoughEndoplasmicReticulum.● ItsynthesisesproteinsattheRoughEndoplasmicReticulumwhicharemeantforsecretionoutofthecell. (b)● Theliverisinchargeofvariousmetabolicprocessessuchasthebreakdownofhormones/excessaminoacidsintourea/harmfulsubstancessuchasalcohol/synthesisofbilesynthesisofbloodproteins,whichrequiresalotofenergy.● Hencelivercellsneedmanymitochondriatogeneratelargeamountsofenergyviaaerobicrespiration. (c)Choose2:● Cellwall● Chloroplasts● Largecentralvacuole (d)● Microvilliincreasesurfaceareatovolumeratioofthesmallintestineincontactwiththecontentsofthelumen,● Forfasterabsorptionofdigestedfoodsubstancessuchasglucoseandaminoacidsfromthelumenintoepithelialcells. Stillwantmore?www.thatbiotutor.com- www.instagram.com/thatbiotutor/-www.youtube.com/@thatbiotutor- www.tiktok.com/@thatbiotutor

Credit:WrittenbythecollectiveeffortofourtutorsatThatBioTutor. Youarewelcometosharethesewithanyoneyou’dlike!Justdon’tsellthemforprofit:) Q2.(a)● ChambersAandBhavethethinnestwallsof3mmastheyaretheatriaoftheheart,● Andonlyneedtopumpbloodashortdistanceintotheventricleshencedonotneedtobethatmuscular.● ChamberChasathicknessof5mmasitistherightventricle,andDwhichistheleftventricleisof12mm.● Conlyneedstopumpbloodtothelungs,whereasDneedstopumpitaroundthewholebodytoafurtherdistanceandathigherpressure,hencerequiringthickermuscularwalls. (b)● Thisallowsoxygenatedanddeoxygenatedbloodtomix,sobloodpumpedouttheaortaaroundthebodywillbelessoxygenated,● Cellsaroundthebodyreceivelessoxygenforaerobicrespirationtoreleaseenergy,thepersonwillfeelingeasilyfatigued/weak/shortofbreath/fainting/dizzy. (c)● Adiethighinsaturatedfats/sedentarylifestyle/smoking. Stillwantmore?www.thatbiotutor.com- www.instagram.com/thatbiotutor/-www.youtube.com/@thatbiotutor- www.tiktok.com/@thatbiotutor

Credit:WrittenbythecollectiveeffortofourtutorsatThatBioTutor. Youarewelcometosharethesewithanyoneyou’dlike!Justdon’tsellthemforprofit:) Q3.(a)● Aswaterpotentialofmesophyllcellsislowerthanthatofthexylem,● Watermovesfromxylemvesselsat(1)intomesophyllcellsat(2)byosmosistoreplacethewaterlost.● Waterthenmovesoutofmesophyllcells,formin