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A2 Biology OCR June 2015 Revision Thread

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Thank you

do these notes cover everything? I've used the textbook for Excretion and Photosynthesis, after that it just seems too long lol

Yeah pretty Much because this is basically just the spec with answers so it's very efficient 😉

Reply 1261

baffledchick

Original post by YouAgain

Yeah pretty Much because this is basically just the spec with answers so it's very efficient 😉

Thank you!! I'll memorise them and then do past papers :smile:

Just need a B in this but my mocks haven't been going well for this unit, I thought it was pretty simple but..

Reply 1262

biologygirl22

are there any predictions yet??
:tongue:

Reply 1263

TheLegalDealer

Can anyone tell me the function of the Distal convuluted tubule and how to answer a question that asks "outline the sequencing of a genome" because I see people on about BACs which is not stated in my book

Many thanks

Reply 1264

Beni24

Whats an example of a positive feedback? i

Reply 1265

biologygirl22

Original post by Beni24

Whats an example of a positive feedback? i

releasing oxytocin during childbirth

Reply 1266

seph_muriel

Original post by lilmizh05

Hey does anyone have the June 2014 paper for F215?

http://www.thebiotutor.com/past-papers3.html

All the recent biology papers +mark schemes :smile:

Reply 1267

tewas

Original post by TheLegalDealer

DCT uses active transport to adjust the concentration of the fluid (urine) before entering the collecting duct. This ensures that the fluid in the collecting duct will have a high water potential so deeper into the medulla, there will be a steep water potential gradient so water can be reabsorbed by osmosis.

Reply 1268

mushyD

Someone tell me what topic areas/questions that could be asked on f214

Reply 1269

Hilton184

Original post by Student23478

Usually They come up in tix boxes but how the hell do we know what to tick??? I get really confused with Q like that

Do you have an example question like this?

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Reply 1270

AnnekaChan173

Original post by Beni24

Whats an example of a positive feedback? i

Dropping body temp -> Hypothermia too. Oxytocin is safer though.

Reply 1271

Beni24

Original post by AnnekaChan173

Dropping body temp -> Hypothermia too. Oxytocin is safer though.

Okay thank you, Do you know if they can ask us 7 markers?

Reply 1272

Hilton184

Original post by AnnekaChan173

Dropping body temp -> Hypothermia too. Oxytocin is safer though.

Why does drop in body temp causes further drop in body temp? Surely we'd role off the standard answer about how drop in temp detected by thermoregulartory centre in hypothalamus and then talk about the ways in which body temperature is increased again, hence negative feedback? Or am I misunderstanding something?

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Reply 1273

AnnekaChan173

Original post by Beni24

Okay thank you, Do you know if they can ask us 7 markers?

On positive feedback? No, I'd be surprised if we even got a two/three on positive feedback tbh. Easily though for a change in body temperature negative feedback loop.

Reply 1274

ImogenWillis

What is the hardest past paper??

Reply 1275

maisie__x

Original post by Beni24

Whats an example of a positive feedback? i

Just to further ease your mind we don't actually need to know an example, just the definition :smile:

Reply 1276

maisie__x

Original post by ImogenWillis

What is the hardest past paper??

Both June 2011 and June 2014 you only had to get 40 marks to get an A, the lowest it's ever been so i'd assume they're the ones people found the hardest

Reply 1277

TheLegalDealer

How would i answer "outline the sequencing of a genome " i have no clue how to and people are banging on about BACs which ive never heard of , Help me Please !!!!!!

Reply 1278

ImogenWillis

Original post by maisie__x

Both June 2011 and June 2014 you only had to get 40 marks to get an A, the lowest it's ever been so i'd assume they're the ones people found the hardest

Thanks, do you know which papers would be the best ones to look over or do before the exam to prepare??

Reply 1279

ImogenWillis

Original post by TheLegalDealer

How would i answer "outline the sequencing of a genome " i have no clue how to and people are banging on about BACs which ive never heard of , Help me Please !!!!!!