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AQA BIOL5 ~ 17th June 2013 ~ A2 Biology

http://filestore.aqa.org.uk/subjects/AQA-2410-W-TRB-GOA-SEQ.PDF

EDIT: Negged? Just pointing out the official guidance on what AQA is suggesting the essay titles may be related to.

Just gave you a thumbs up.

Reply 1121

F1's Finest

21

Original post by erniiee

Congrats. Was it the June 12 paper?

Am I the only one a bit worried about what the grade boundaries will be this year? :lol:

they went from 69 to 71 to 76 for an A* :eek:

Do you have any way of remembering which is temporal and which is spatial? I can't think of anything handy haha

All looks right to me except it releases potassium IONS into the cell, not phosphate molecules. Heres a nice summary of the Na+/K+ pump I found:

•

The pump, while binding ATP, binds 3 intracellular Na⁺ ions.

•

ATP is hydrolyzed, leading to phosphorylation of the pump and subsequent release of ADP.

•

A conformational (shape) change in the pump exposes the Na⁺ ions to the outside. The phosphorylated form of the pump has a low affinity for Na⁺ ions, so they are released.

•

The pump binds 2 extracellular K⁺ ions. This causes the dephosphorylation of the pump, reverting it to its previous conformational state, transporting the K⁺ ions into the cell.

•

The unphosphorylated form of the pump has a higher affinity for Na⁺ ions than K⁺ ions, so the two bound K⁺ ions are released. ATP binds, and the process starts again.

Spatial, I just remember it as space, so there's space for more pre-synaptic neurones.

Temporal is just the other one! (more neurotransmitter released in a short space of time).

Reply 1122

F1's Finest

21

Guys, I'm starting to do a mind map for what to discuss in an essay on cycles.

Would predator-prey relationships be classed as a cycle? Or is it too vague a concept?

It would be a nice way to bring in some ecology to the essay :s-smilie:

Reply 1123

Beth_L_G

10

Original post by James A

Guys, I'm starting to do a mind map for what to discuss in an essay on cycles.

Would predator-prey relationships be classed as a cycle? Or is it too vague a concept?

It would be a nice way to bring in some ecology to the essay :s-smilie:

'twas in The mark scheme so yep put it in :smile:

Reply 1124

F1's Finest

21

Original post by Beth_L_G

'twas in The mark scheme so yep put it in :smile:

So it was in a recent paper? Damn, which paper was this? I'm on TSR via my mobile.

Thanks :smile:

Reply 1125

Mocking_bird

11

Original post by James A

So it was in a recent paper? Damn, which paper was this? I'm on TSR via my mobile.

Thanks :smile:

June 2011.

"A cycle is a biological pathway or processes in which the end product of one cycle becomes the starting point for the next cycle. Write an essay about cycles in biology"

Reply 1126

F1's Finest

21

Original post by Mocking_bird

June 2011.

"A cycle is a biological pathway or processes in which the end product of one cycle becomes the starting point for the next cycle. Write an essay about cycles in biology"

Reply 1127

king101

3

Original post by erniiee

Congrats. Was it the June 12 paper?

Am I the only one a bit worried about what the grade boundaries will be this year? :lol:

they went from 69 to 71 to 76 for an A* :eek:

Do you have any way of remembering which is temporal and which is spatial? I can't think of anything handy haha

All looks right to me except it releases potassium IONS into the cell, not phosphate molecules. Heres a nice summary of the Na+/K+ pump I found:

•

The pump, while binding ATP, binds 3 intracellular Na⁺ ions.

•

ATP is hydrolyzed, leading to phosphorylation of the pump and subsequent release of ADP.

•

A conformational (shape) change in the pump exposes the Na⁺ ions to the outside. The phosphorylated form of the pump has a low affinity for Na⁺ ions, so they are released.

•

The pump binds 2 extracellular K⁺ ions. This causes the dephosphorylation of the pump, reverting it to its previous conformational state, transporting the K⁺ ions into the cell.

•

The unphosphorylated form of the pump has a higher affinity for Na⁺ ions than K⁺ ions, so the two bound K⁺ ions are released. ATP binds, and the process starts again.

Thank you

Posted from TSR Mobile

Reply 1128

Tikara

Original post by Mocking_bird

Yep

ahh okee thanks mate :biggrin:

Do you also know if action potential and nerve impulse are the same thing? I'm finding it a bit hard to understand

Reply 1129

Tikara

Original post by thescientist17

I know it's a bit early but I'm going to try and revise as I go along so I thought there should be a place ready for any questions anyone might have as we go along and learn the content. :smile:

Also a place to discuss ISAs/ EMPAs, in my opinion the worst part!

For now, here's the answers to the exam style questions:

These are awesome- the comments are especially helpful thanks so much! :adore:

Reply 1130

king101

3

Anyone think this is a good idea;
For someone (me) that has forgotten EVERYTHING SYNOPTIC RELATED i.e. everything from unit 1-4 (yeah I have bad long term memory lol) get the A2 NT Unit 5 section, and go through it, whenever it says 'Link' look at the synoptic and just revise them sections.
I have already began it, just finished stuff about the hear/cardiac cycle. Once I've finished it, Ill post it on this thread.

Posted from TSR Mobile

Reply 1131

Gulzar

2

For the essay can you include topics that are completely off the specification such as excretion in kidneys? Would that count as the extra reading?

Reply 1132

Beth_L_G

10

Original post by Gulzar

For the essay can you include topics that are completely off the specification such as excretion in kidneys? Would that count as the extra reading?

As long as its related to the question you can write about anything that's not on the spec

Reply 1133

erniiee

13

Original post by James A

Spatial, I just remember it as space, so there's space for more pre-synaptic neurones.

Temporal is just the other one! (more neurotransmitter released in a short space of time).

Ah okay. I'm thinking of temporal = temper..so one neurone getting up in my grill ahaha

Original post by Mocking_bird

June 2011.

"A cycle is a biological pathway or processes in which the end product of one cycle becomes the starting point for the next cycle. Write an essay about cycles in biology"

Pisses me off so much when I read that in papers, its like go away AQA, I'm not doing English :rant:

Original post by king101

Thank you

Posted from TSR Mobile

No prob. Gotta love wikipedia!

Reply 1134

JenLivYoung

Original post by Beth_L_G

As long as its related to the question you can write about anything that's not on the spec

Just make sure you know it in enough detail to talk about it and don't just throw in a random line about it :smile:

Reply 1135

noreaction

what do people find hard ???

i find
the last bit on DNA really hard
in vitro
in vivio
geen cloning

and muscles very hard

and the oestrogen cycle

Reply 1136

Minnie me

Original post by noreaction

what do people find hard ???

i find
the last bit on DNA really hard
in vitro
in vivio
geen cloning

and muscles very hard

and the oestrogen cycle

Same here, but I find muscles ok

Me :biggrin:

Reply 1137

Mocking_bird

11

Original post by noreaction

what do people find hard ???

i find
the last bit on DNA really hard
in vitro
in vivio
geen cloning

and muscles very hard

and the oestrogen cycle

I dislike all the action potential stuff to be honest. It'll be alright once I get it memorised but yeah.

Reply 1138

noreaction

Original post by Mocking_bird

I dislike all the action potential stuff to be honest. It'll be alright once I get it memorised but yeah.

oh i think that bit is ok

how confident are you on the dna bit towards the end and the essay in general

how can i better myself if i have no lessons to go to ??

Reply 1139

F1's Finest

21

Original post by erniiee

Ah okay. I'm thinking of temporal = temper..so one neurone getting up in my grill ahaha

Pisses me off so much when I read that in papers, its like go away AQA, I'm not doing English :rant:

No prob. Gotta love wikipedia!

Temper hahaha.

AQA BIOL5 ~ 17th June 2013 ~ A2 Biology

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