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AQA A - LEVEL BIOLOGY 2023 PAPER 2 WITH ANSWERS $9.89   Add to cart

Exam (elaborations)

AQA A - LEVEL BIOLOGY 2023 PAPER 2 WITH ANSWERS

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  • Course
  • AQA BIO
  • Institution
  • AQA BIO

AQA A - LEVEL BIOLOGY 2023 PAPER 2 WITH ANSWERS Limitingzfactorszforzphotosynthesisz-zCORRECTzANSWER-lightzintensity,zcarbonzdioxidezconcentrationzandztemperature Describezchloroplastsz-zCORRECTzANSWER--granazarezstackedzintoz100szdisczcalledzthylakoids:zlightzdependent -stroma:zlightzindepe...

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  • October 2, 2024
  • 12
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers
  • effectors
  • receptorsz
  • structurezofzactinz
  • AQA BIO
  • AQA BIO
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LmstopAchiever
AQA A - LEVEL BIOLOGY 2023 PAPER 2 WITH
ANSWERS
Limitingzfactorszforzphotosynthesisz-zCORRECTzANSWER-
lightzintensity,zcarbonzdioxidezconcentrationzandztemperature



Describezchloroplastsz-zCORRECTzANSWER--
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-stroma:zlightzindependent



Givez4zadaptationszofzchloroplastsz-zCORRECTzANSWER-1-
zfluidzofzstromazhaszallzenzymesztozcarryzoutzlightzindependent


2-zstromalzfluidziszmembranezboundzinzchloroplasts

3-zthezfluidzsurroundzthezgranazsozproductszofzlightzdependentzcanzreadilyzdiffusezintozstroma

4-zcontainszbothzDNAzandzribosomeszforzproteinsztozbezmanufacturedzquicklyzinzlightzindependent



Stimulusz-zCORRECTzANSWER-
azdetectablezchangezinzthezenvironmentzofzanzorganismzthatzleadsztozazresponse



receptorsz-zCORRECTzANSWER-specificztozoneztypezofzstimuluszandzdetectzazstimulus



Effectorsz-zCORRECTzANSWER-musclezorzglandszthezproducezazresponse



Reflexzarcz-zCORRECTzANSWER-stimulus

receptors

sensoryzneurone

CNSz(centralznervouszsystem)

Motorzneurone

Effectors

, Taxisz-zCORRECTzANSWER-Azresponsezwhosezdirectionziszdeterminedzbyzthezdirectionzofzthezstimulus



Kinesisz-zCORRECTzANSWER-wherezanzorganismzchangeszthezspeedzandzratezatzwhichzitzchangeszdirection



Tropismz-zCORRECTzANSWER-Azgrowthzresponsezofzazplantzinzresponseztozazdirectionalzstimulus



Describezrodzcellsz-zCORRECTzANSWER--
zManyzconnectztoz1zsinglezsensoryzneuronezwhichzcauseszazgreaterzpotentialzbyzrhodopsinztozbezbrokenzd

ownz

-zDetectzveryzlowzlightzintensityz

-Lowzvisualzacuityzaszmanyzcellszconnectztozazsinglezbipolarzcell



Describezconezcellsz-zCORRECTzANSWER--Lesszsensitiveztozlight,zbutzfasterzresponse

-Responsiblezforzdayzlightzfinezvisionzandzcolourzvisionz(PhotopiczVision)

-approx.6zmillionzcones

-
Iodopsinzrequireszazhigherzlightzintensityzforzitztozbreakzdownzandzaszazresulyzeachziszsensitiveztozdifferentz
wavelengthszinzcells.

-zGoodzvisualzacuity



Temporalzsummationz-zCORRECTzANSWER-
wherez1zpresynapticzneuronezreleaseszlotszofzneurotransmitterzrepeatedlyztozreachzthezthresholdzvalueza
ndztriggerzanzactionzpotential



spatialzsummationz-zCORRECTzANSWER-
severalzpresynapticzneuroneszreleasezneurotransmittersztozreachzthezthresholdzvaluezofzthezpostynapticzn
euronezandztriggerzanzactionzpotential



RefractoryzPeriodz-zCORRECTzANSWER-
theztimezfollowingzanzactionzpotentialzduringzwhichzaznewzactionzpotentialzcannotzbezinitiated

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