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Exam (elaborations)

A LEVEL BIOLOGY PAPER 3 QUESTIONS AND ANSWERS

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A LEVEL BIOLOGY PAPER 3 QUESTIONS AND ANSWERS

Institution
2024_AQA: A-level BIOLOGY Paper 3
Course
2024_AQA: A-level BIOLOGY Paper 3

Content preview

Benedict'sxctestxc-xcanswer--Testxcforxcreducingxcsugars

PositivexcBenedict'sxcTestxc-xcanswer--Brickxcred

Biuretxctestxc-xcanswer--testxcforxcproteins

positivexcbiuretxctestxc-xcanswer--purple

testxcforxcnon-reducingxcsugarsxc-xcanswer--HeatxcwithxcBenedict's
Ifxcnegativexc(staysxcblue),xchydrolysexcsubstancexcwithxcHClxcandxcneutralisexcwithxcNaO
H.xc(orxchydrolysexcwithxcanxcenzyme)
HeatxcwithxcBenedict'sxcBrickxcredxcprecipitatexcindicatesxcnon-xcreducingxcsugar.

Emulsionxctestxc-xcanswer--
laboratoryxctestxcforxclipidsxcusingxcethanol;xcaxcwhitexcemulsionxcindicatesxcthexcpresencex
cofxcaxclipid.



Iodinexctestxc-xcanswer--Testxcforxcstarch

positivexcstarchxctestxc-xcanswer--iodinexcgoesxcfromxcbrownxctoxcblue/blackxcinxccolour

serialxcdilutionxc-xcanswer--
Dilutionxcofxcaxcsubstancexcseveralxctimesxcbyxcthexcsamexcamountxceachxctime

Planxcdiagramxc-xcanswer--
Showingxcthexcoutlinexcofxcareasxcofxceachxctissuexcbutxcshowingxcnoxcdetailxcofxccells

highxcpowerxcdiagramxc-xcanswer--Showingxcthexcdetailsxcofxcaxcsmallxcsamplexcofxccells

Howxctoxcdrawxccellxcwallsxc-xcanswer--Doublexclined




A LEVEL BIOLOGY PAPER 3
QUESTIONS AND ANSWERS
systematicxcerrorxc-xcanswer--
Errorxcthatxcshiftsxcallxcmeasurementsxcinxcaxcstandardizedxcway.xcDecreasesxcaccuracy.xc
Canxcresultxcinxcbias

randomxcerrorsxc-xcanswer--
occurxcbecausexcofxcrandomxcandxcinherentlyxcunpredictablexceventsxcinxcthexcmeasurem
entxcprocess

%xcchangexcinxcmassxc-xcanswer--(finalxcmass-initialxcmass)/initialxcmassxcxxc100
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  • a level biology paper 3 questions and answers
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