Biology paper 1- 2024 with legit
answers
The rratio rof rsaturated rto runsaturated rfatty racids rin ra rcell-surface rmembrane
rdetermines rthe rextent rof rthe rmembrane's rfluidity.
Suggest rand rexplain rwhy rthere rwas rmore rphagocytosis. r[3 rmarks] r-
rCORRECT✅✅1. rMore runsaturated rfatty racids rincreases rfluidity r(in r(cell-surface
rmembrane);
2. r(Making rcell-surface) rmembrane rmore rfluid/ rflexible;
3. rEasy rto rengulf;
Describe rthe rprocesses rof rfacilitated rdiffusion rand ractive rtransport.
[3 rmarks] r- rCORRECT✅✅2. r(Facilitated rdiffusion) rmovement rdown ra
concentration rgradient rvia rcarrier/channel
protein;
3. r(Active rtransport) rmovement ragainst ra
concentration rgradient rvia rcarrier rprotein rusing
ATP;
What rare rmicrovilli?
[1 rmark] r- rCORRECT✅✅(Highly) rfolded rcell(-surface) rmembrane;
Vitamin rA ris ra rfat-soluble rsubstance.
Micelles rare rinvolved rin rthe rprocess rof rvitamin rA rabsorption.
Describe rthe rprocess rof rvitamin rA rabsorption rinto rcells rlining rthe rileum.
[3 rmarks] r- rCORRECT✅✅1. rCombine/mix/join rwith rbile rsalts;
2. rMake r(more) rsoluble r(in rwater);
3. rDiffuses r(into rcells/ileum);
Describe rhow rwe rbreathe rin.
[3 rmarks] r- rCORRECT✅✅1. rDiaphragm r(muscle) rcontracts rpulling rdiaphragm
down;
2. rExternal rintercostal rmuscles rcontract
pulling/moving rribs rupwards/outwards;
3. r(Causes) rvolume rincrease rand rpressure
decrease rin rthoracic rcavity;
Use ryour runderstanding rof rosmosis rto rexplain rwhy rthe rair rpressure rin rthe
tube rincreased.
[3 rmarks] r- rCORRECT✅✅1. rMolasses/solution rhas ra rlower rwater rpotential
2. rWater rmoves rin r(across) rpartially/selectively rpermeable rbladder;
3. rIncreased r(molasses/solution) rvolume
answers
The rratio rof rsaturated rto runsaturated rfatty racids rin ra rcell-surface rmembrane
rdetermines rthe rextent rof rthe rmembrane's rfluidity.
Suggest rand rexplain rwhy rthere rwas rmore rphagocytosis. r[3 rmarks] r-
rCORRECT✅✅1. rMore runsaturated rfatty racids rincreases rfluidity r(in r(cell-surface
rmembrane);
2. r(Making rcell-surface) rmembrane rmore rfluid/ rflexible;
3. rEasy rto rengulf;
Describe rthe rprocesses rof rfacilitated rdiffusion rand ractive rtransport.
[3 rmarks] r- rCORRECT✅✅2. r(Facilitated rdiffusion) rmovement rdown ra
concentration rgradient rvia rcarrier/channel
protein;
3. r(Active rtransport) rmovement ragainst ra
concentration rgradient rvia rcarrier rprotein rusing
ATP;
What rare rmicrovilli?
[1 rmark] r- rCORRECT✅✅(Highly) rfolded rcell(-surface) rmembrane;
Vitamin rA ris ra rfat-soluble rsubstance.
Micelles rare rinvolved rin rthe rprocess rof rvitamin rA rabsorption.
Describe rthe rprocess rof rvitamin rA rabsorption rinto rcells rlining rthe rileum.
[3 rmarks] r- rCORRECT✅✅1. rCombine/mix/join rwith rbile rsalts;
2. rMake r(more) rsoluble r(in rwater);
3. rDiffuses r(into rcells/ileum);
Describe rhow rwe rbreathe rin.
[3 rmarks] r- rCORRECT✅✅1. rDiaphragm r(muscle) rcontracts rpulling rdiaphragm
down;
2. rExternal rintercostal rmuscles rcontract
pulling/moving rribs rupwards/outwards;
3. r(Causes) rvolume rincrease rand rpressure
decrease rin rthoracic rcavity;
Use ryour runderstanding rof rosmosis rto rexplain rwhy rthe rair rpressure rin rthe
tube rincreased.
[3 rmarks] r- rCORRECT✅✅1. rMolasses/solution rhas ra rlower rwater rpotential
2. rWater rmoves rin r(across) rpartially/selectively rpermeable rbladder;
3. rIncreased r(molasses/solution) rvolume
