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Exam (elaborations)

AQA AS Biology Paper 2 2025 | Questions & Mark Scheme

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Official AQA AS Biology Paper 2 from June 2025. Topics: cell biology, transport, enzymes, genetics, disease. Mark scheme included.

Institution
AQA AS Biology
Course
AQA AS Biology

Content preview

Pleasevwritevclearlyvinvblockvcapital
s.
Centrevnumbe Candidatevnumbe
r r

Surname v

Forename(s) v

Candidatevsignature
Ivdeclarevthisvisvmyvownvwork.



AS
BIOLOGY
Paperv2


Thursdayv22vMayv2025 Morning Timevallowed:v1vhourv30vminutes
Materials ForNExaminer’sNUse
Forvthisvpapervyouvmustvhave:
Question Mark
 avrulervwithvmillimetrevmeasurements
 avscientificvcalculator. 1
2
Instructions 3
 Usevblackvinkvorvblackvball-pointvpen.
4
 Fillvinvthevboxesvatvthevtopvofvthisvpage.
 Answervallvquestions. 5
 Youvmustvanswervthevquestionsvinvthevspacesvprovided.v Dovnotv 6
writevoutsidevthevboxvaroundveachvpagevorvonvblank pages. N
7
 Ifvyouvneedvextravspacevforvyourvanswer(s),vusevthevlinedvpagesvatvthev
endvofvthisvbook.v Writevthevquestionvnumbervagainstvyourvanswer(s). 8
 Showvallvyourvworking. 9
 Dovallvroughvworkvinvthisvbook.v Crossvthroughvanyvworkvyouvdovnot N
TOTAL
wantvtovbevmarked.

Information
 Thevmarksvforvthevquestionsvarevshownvinvbrackets.
 Thevmaximumvmarkvforvthisvpapervisv75.




7 401 /2
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0 1 vFigurev1vshowsvthevarrangementvofvsomevofvthevbloodvvesselsvinvavmammalianvci
rculavtoryvsystem.

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[2vmarks]

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at transportvdeoxygenatedvblood.
N


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Manyvanimalsvarevadaptedvtovtheirvenvironmentsvbyvhavingvdifferentvty
pesvofvhaevmoglobinvwithvdifferentvtertiaryvstructures.

Usingvyourvknowledgevofvthevstructurevofvproteins,vexplainvhowvdifferent type
N


svofvhaemoglobinvcanvhavevdifferentvtertiaryvstructures.
[3vmarks]




Questionv1vcontinuesvonvthevnextvpage




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IB/M/Jun25/7401/2

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IB/M/Jun25/7401/2

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Institution
AQA AS Biology
Course
AQA AS Biology

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Uploaded on
May 16, 2026
Number of pages
54
Written in
2025/2026
Type
Exam (elaborations)
Contains
Questions & answers
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