AQA A-level Biology Paper 1 June 2025 | Questions & Mark Scheme

Pleasevwritevclearlyvinvblockvcapitals.

Centrevnumber Candidatevnumber


Surname v




Forename(s) v




Candidatevsignature
Ivdeclarevthisvisvmyvownvwork.



A-level
BIOLOGY
Paper 1 v




Thursday 5 June 2025
v v v Afternoon Time allowed: 2 hours
v v v



Materials ForvExaminer’svUse
Forvthisvpapervyouvmustvhave:
Question Mark
 avrulervwithvmillimetrevmeasurements
 avscientificvcalculator. 1
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Instructions 3
 Usevblackvinkvorvblackvball-pointvpen.
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 Fillvinvthevboxesvatvthevtopvofvthisvpage.
 Answervallvquestions. 5
 Youvmustvanswervthevquestionsvinvthevspacesvprovided.v Dovnotvwritev 6
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 Thevmarksvforvthevquestionsvarevshownvinvbrackets.
 Thevmaximumvmarkvforvthisvpapervisv91.




7402 /1
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v outsidevth
Answervallvquestionsvinvthevspacesvprovided. e box




0 1 .v 1 Thevdigestionvandvabsorptionvofvlipidsvinvolves:
v




 emulsificationvbyvbilevsalts
 micelles.

Explainveachvofvthevfollowing.
[4vmarks]

Thevimportancevofvemulsificationvinvthevdigestionvofvlipidsv




Thevrolevofvmicellesvinvthevabsorptionvofvlipidsv




0 1 .v 2 Describevandvexplainvthevarrangementvofvphospholipidvmoleculesvinvthevcell-
surfacevmembrane.
[2vmarks]




6




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0 2 . 1 DescribevhowvmRNAvisvobtainedvfromvpre-mRNA. e box

[1vmark]




0 2 . 2 DescribevhowvRNAvpolymerasevjoinsvRNAvnucleotides.
[2vmarks]




Questionv2vcontinuesvonvthevnextvpage




Turnvoverv►

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0 2 . 3 Figurev1vshowsvthevenergyvcontainedvinvmoleculesvduringvanvenzyme- e box

controlledvreaction.

Figurev1




Whichvexpressionvrepresentsvthevactivationvenergyv(Ea)vofvthisvreaction?

Tickv()vonevbox.
[1vmark]


Av–vC


Dv–vC

Dv–
CvB
v




D




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