A2 Biology OCR June 2015 Revision Thread

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Wow, that's actyally insane... Have you spoken to your teachers?

Yeah and they've said they can't do anything about it and that's that basically.

Luckily, I only need just A*s as opposed to full UMS but that's still a challenge in itself.

Reply 181

acd55

which old spec past papers correspond to each unit?
and which parts of the new spec are missing from the old spec or what does the old spec have that the new spec doesn't?
cheers :smile:

Reply 182

carina_jasmine

Can someone help me with genomes and genetic sequencing, i'm so confused!!

I just need an outline of how it works and how the things are linked like sanger, BAC, PCR, electrophoresis and all that stuff...the text book makes no sense to me at all!!

Reply 183

lovekitty123

Is starting revision for a2 bio this time of year too late :frown:

?

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Reply 184

SulTob

Please does anyone have AS biology ocr official textbook and is willing to sell?

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Reply 185

AnnekaChan173

Original post by smozsolution

Yeah and they've said they can't do anything about it and that's that basically.

Luckily, I only need just A*s as opposed to full UMS but that's still a challenge in itself.

"I just need an A*"
Sorry I think I just cried a little.

Original post by lovekitty123

Is starting revision for a2 bio this time of year too late :frown:

?

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No. I started at this time last year and I did okay. You'll probably have to devote more time to Unit 5 though, since it's flipping huge.

Original post by adekunle

Please does anyone have AS biology ocr official textbook and is willing to sell?

Posted from TSR Mobile

Bit late in the year? I sold mine early, sorry. Amazon is pretty good, and they're quite cheap too if you get it secondhand

Reply 186

lovekitty123

Original post by AnnekaChan173

No. I started at this time last year and I did okay. You'll probably have to devote more time to Unit 5 though, since it's flipping huge

What did u get last year if you don't mind me asking? And how did u study?

Reply 187

AnnekaChan173

Original post by lovekitty123

What did u get last year if you don't mind me asking? And how did u study?

An A, and I mainly stared at my notes while doing past paper questions. Didn't do it to time conditions until much later for some reason. I didn't really have much of a plan of action last year hahaha

Reply 188

lovekitty123

Original post by AnnekaChan173

Thats really good! Ill be so happy with an A in bio lol, it a killer. Is this for AS or A2?

Reply 189

AnnekaChan173

Original post by lovekitty123

Thats really good! Ill be so happy with an A in bio lol, it a killer. Is this for AS or A2?

AS hahahahaha, back with biology was manageable! Now it's all horrid.

Reply 190

games211

what do we need to know about peritoneal dialysis?

Reply 191

ChoccyPhilly

Original post by games211

what do we need to know about peritoneal dialysis?

Outline how it works and compare its effectiveness with normal dialysis e,g more convenient but chance of infection

Reply 192

smozsolution

Original post by AnnekaChan173

"I just need an A*"
Sorry I think I just cried a little

Oh don't worry, I die inside a bit when it comes to bio revision and I realise the momentous task ahead of me haha!

Reply 193

games211

Original post by ChoccyPhilly

Outline how it works and compare its effectiveness with normal dialysis e,g more convenient but chance of infection

I know what it is but I don't understand how it works :frown:

Its a permanent tube surgically inserted into the abdomen.
Dialysis fluid is pumped into the tube :frown:

Reply 194

Kell_

If we get an 8 mark on
Explain that coenzyme A carries acetate from the link reaction to the Krebs cycle
:eek3:

Reply 195

Hmht

Original post by Kell_

If we get an 8 mark on
Explain that coenzyme A carries acetate from the link reaction to the Krebs cycle
:eek3:

What would you write for 8 marks??

Reply 196

ChoccyPhilly

Original post by Kell_

If we get an 8 mark on
Explain that coenzyme A carries acetate from the link reaction to the Krebs cycle
:eek3:

Trying desperately to break down that question. Perhaps we outline the link reaction then waffle on about enzymes and how coenzymes actually work etc.

I do hate Ocr sometimes

Reply 197

Kell_

Original post by Hmht

What would you write for 8 marks??

Original post by ChoccyPhilly

Trying desperately to break down that question. Perhaps we outline the link reaction then waffle on about enzymes and how coenzymes actually work etc.

I do hate Ocr sometimes

I've found something on Page 97 of the Heinemann purple book which I think it wants us to say, but I'm struggling to see how we'd be awarded eight marks for it.

Fatty acid-CoA complex is transported into the mitochondrial matrix where it is broken down into 2-carbon acetyl groups that are attached to CoA. During this breakdowm, by the B-oxidation pathway, reduced NAD and reduced FAD are formed. The acetyl groups are released from the CoA and enter the Krebs Cycle.

Then I'd explain the theory of a general coenzyme.