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Exam (elaborations)

BIOLOGY PAPER 3 2024 QUESTIONS AND ANSWERS

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BIOLOGY PAPER 3 2024 QUESTIONS AND ANSWERS

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

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BIOLOGY PAPER 3 2024 QUESTIONS
AND ANSWERS

1.1xcDescribexchowxcstimulationxcofxcaxcPacinianxccorpusclexcproducesxcaxcgeneratorxcpot
ential.
[3xcmarks]xc-xcanswer--
1.xcthexcstretchxcmediatedxcsodiumxcionsxcchannelsxcinxcthexcmembranexc
2.xcincreasexcpressurexcwhichxcdeformsxcthexcsensoryxcneuronexclamellae.
3.xcsodiumxcionxcchannelsxcopenxcandxcsodiumxcdiffusesxcin.xcthexcinsidexcofxcthexcmembra
nexcbecomesxcmorexcpositivexcleadingxctoxcaxcgeneratorxcpotential

4.4)xcAllxcnewxccardiomyocytesxcproduced:
xcConnexin-

43,xcaxcchannelxcproteinxcthatxcallowsxcelectricalxcimpulsesxctoxcpassxcbetweenxccardiomy
ocytes
xcGATA-

4,xcaxctranscriptionalxcfactorxcthatxcstimulatesxcthexcexpressionxcofxcgenesxcforxcactinxcandxc
myosin.

SuggestxchowxcproductionxcofxcConnexin-43xcandxcGATA-
4xccouldxcgivexcthexcresultxcseenxcinxcthexcc-KIT+xcgroupxcinxcFigurexc6xc(onxcpagexc13).
Doxcnotxcincludexcdetailsxcofxctranscriptionxcorxctranslationxcinxcyourxcanswer.
[2xcmarks'xc-xcanswer--
1.xcallowsxcimpulsesxctoxcpassxctoxcthexcapexxcofxcthexcheartxcthroughxcpurkynexctissuexc
2.xcmorexcactinxcmyosinxcbridgesxcarexcformedxcasxctherexcarexcmorexcbindingxcsitesxconxcth
excactin

5.2)xcInxc1997,xcthexcscientistsxcrecordedxcthexchighestxcspeciesxcrichness,xcbutxcthexclowe
stxcvaluexcofxcdxcoverxcthexc29xcyears.

Describexcandxcexplainxchowxcthesexcresultsxcforxc1997xcwerexcpossible.
[2xcmarks]xc-xcanswer--
1.xctherexcwerexc48xcdifferentxcspeciesxcinxc1997xcwhichxcwasxcthexcyearxcwithxcthexclargestx
cnumberxcofxcspecies

2.xchoweverxc1xcspeciesxcwasxcpresentxcinxcaxcveryxclargexcquantity.

6.1)xcGivexctwoxctypesxcofxccellxcthatxccanxcstimulatexcanxcimmunexcresponse.
[2xcmarks]xc-xcanswer--1.xcpathogensxc
2.antigenxcpresentingxccell

6.6)xcInxcmice,xconexctypexcofxcautoimmunexcdiseasexcisxcinheritedxcasxcaxcdominantxcallele
.xcWouldxcthexcHardy-
Weinbergxcprinciplexcholdxctruexcforxcaxcpopulationxcofxcmice,xcsomexcofxcwhichxchadxcthisxc
autoimmunexcdisease?
Explainxcyourxcanswer.
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2024_AQA: A-level BIOLOGY Paper 3
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2024_AQA: A-level BIOLOGY Paper 3

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  • biology paper 3 2024 questions and answers
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