2018 TYS Answers (ThatBioTutor).docx

Credit:WrittenbythecollectiveeffortofourtutorsatThatBioTutor. Youarewelcometosharethesewithanyoneyou’dlike!Justdon’tsellthemforprofit:) TYSAnswers2018(ThatBioTutorEdition) IMPTNOTE:- Fordifferencesbetween2023and2024syllabus,seethislisthere.- *Shadedblack=outofsyllabusfrom2024onwards Question Ans Question Ans1 A 21 B2 A 22 D3 B 23 A4 B 24 D5 C 25 C6 D 26 C7* C 27 D8 A 28 B9 B 29 B10 A 30 A11 C 31* C12 B 32* D13 C 33* A14 D 34 C15 A 35 D16 B 36 A17 C 37 C18 C 38 B19* B 39 D20 D 40 D *Q31:Homologouschromosomes“formpairsinmitosisandmeiosis”isoutofsyllabus,buttherestoftheoptionsareinsyllabus. 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) ● Chromosome/chromatid (ii)● 3:Metaphase● 4:Anaphase (b)(i) ● Plant2. (ii)● Plant1:AA● Plant3:aa Stillwantmore?www.thatbiotutor.com- www.instagram.com/thatbiotutor/-www.youtube.com/@thatbiotutor- www.tiktok.com/@thatbiotutor

Credit:WrittenbythecollectiveeffortofourtutorsatThatBioTutor. Youarewelcometosharethesewithanyoneyou’dlike!Justdon’tsellthemforprofit:) Q2.(a)(i)Any3:● Thelivercarriesoutdetoxification,whereharmfulsubstancessuchasalcoholareconvertedintoharmlessones.● Hormonesarebrokendownattheliveraftertheyhavecausedtargetorganstocarryouttheresponse.● Theliverproducesbile,whichisthenstoredinthegallbladder. Bileaidsinfatdigestion.● Theliverstoresironfromthebreakdownofhaemoglobinofoldredbloodcells,tobeusedformakingnewredbloodcells.● Thelivercarriesoutdeamination,whereaminogroupsareremovedfromexcessaminoacidsandconvertedintourea.● Theliveraidsinbloodglucoseregulation,convertingglucosetoglycogenwhenbloodglucoseconcentrationistoohigh,andviceversawhenglucoselevelsaretoolow.● Theliversynthesisesbloodproteinssuchasprothrombinandfibrinogen. (ii)● C(pancreas) (iii)Name:● Bile Function:● Bilesaltsinbileemulsifylargefatdropletsintosmallerones,● increasingthesurfaceareatovolumeratioforpancreaticlipaseandintestinallipasetodigestfatsintoglycerolandfattyacids. (b)(i) ● 40°C (ii)● At60°C, thehightemperaturehasdenaturedrennin,theactivesiteisnolongercomplementarytoitssubstratehenceitisnolongerabletocausethemilktoformlumps. (c)● Whenmilkformslumps,itstaysinthestomachlongerforpepsinproteasetodigestmoremilkproteinsintoshortpolypeptides.● Moreshortpolypeptidesarebrokenintoaminoacidsinthesmallintestine,hencemoreaminoacidsareabsorbedintothebloodstreamforassimilationforthegrowthoftheyoungcow. Stillwantmore?www.thatbiotutor.com- www.instagram.com/thatbiotutor/-www.youtube.com/@thatbiotutor- www.tiktok.com/@thatbiotutor

Credit:WrittenbythecollectiveeffortofourtutorsatThatBioTutor. Youarewelcometosharethesewithanyoneyou’dlike!Justdon’tsellthemforprofit:) Q3.(a)(i) ● 3minutes. (ii)● Astemperatureincreasesfrom15to19°C, timetakenforbloodtoclotdecreasessharplyfrom24to13min.● Astemperatureincreasesfurtherfrom19to35°C, ti