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A2 Biology OCR June 2015 Revision Thread

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So what did people put for k on the graph question? (I thought that was disgusting) I put the mean number of all the patients but doubt that was right

Reply 2521

NilaJ

Original post by annnnnnnn

Oh Mann! Good luck!

Thanks, I think it will be difficult but not impossible. It doesn't even matter what I do, I just have to do my best and its the grade boundaries that will decide. I don't need the A* for uni, but I think I've worked my butt off and deserve it for myself!

Good luck to you too!

Reply 2522

Giggy88

Original post by thequackingduck

I wrote kupffer cells; location: liver

I wrote that then changed it to stem cells; bone marrow right at the end. Kupffer cells break them down, not make them.

I wrote the same but without the corrections :frown:

(((

Reply 2523

hamza3256

what did u guys write for incomplete breakdown of glucose question?

Reply 2524

Nellie97

Original post by ojstratton

I don't think it was +ve feed back becuase the beta cells are not a target tissue of insulin. I thought it was a subtle hint at the refractory period in action potentials so said it took time for calcium ions to be pumped out of the membrane and potassium ions to re-establish the resting p.d.

ohhh yeah i think you're right actually, why didn't i think of that :frown:

Reply 2525

kewla1

Original post by Hilton184

Pathogen causes fever, which is increase in body temperature.

Why does fever cause shivering.

Now shivering increases body temperature further so that's not the reason. This question was so difficult! I put shivering means increased respiration to produce more ATP to for protein synthesis to produce antibodies to destroy pathogen. Was really unsure about this.

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hi thanks, i put that (from previous q) that fever causes increased sweating which could make u colder etc so you shiver to generate energy and increasy body temp? do u reckon it'd be okay

Reply 2526

mrchemistry

That exam was so easy! Ocr please make exams harder so they're actually a challenge, and at least test on stuff which we won't know about lol!

Said no one ever.

After that I've waved goodbye to any hopes and dreams I had of a medical career.

Ps: anyone who is a genius, don't make an unofficial markscheme. It will kill me even more.

Reply 2527

Follett

Original post by Hilton184

That's exactly what I put because I remember a past paper question where it spoke about b/T lymphocytes requiring atp

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Reply 2528

annnnnnnn

[QUOTE=NilaJ;56745021]Thanks, I think it will be difficult but not impossible. It doesn't even matter what I do, I just have to do my best and its the grade boundaries that will decide. I don't need the A* for uni, but I think I've worked my butt off and deserve it for myself!

Good luck to you too!
I'm similar! I don't need it but I want it! Feel like I can do it after 100% GCSE and 93% AS too! Obv A2 is a lot harder but still I'm gonna try :smile:

thank you!

Reply 2529

zXx AJL xXz

I also put that glucose is hydrolysed by glycolysis, my teacher said it would have been 'oxidised' but as I put by glycolysis I would probably get the mark :smile:

Reply 2530

tomzorz

I got scared by people saying "pathogen q", I thought I missed a label question on the insulin question or something :colondollar:

Reply 2531

RichBitch

Original post by AnnekaChan173

Tough paper imo, maybe like 42/3 for an A? The dialysis section tho m8m8m8m8m8

I know right!!!

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Reply 2532

Hilton184

Original post by kewla1

hi thanks, i put that (from previous q) that fever causes increased sweating which could make u colder etc so you shiver to generate energy and increasy body temp? do u reckon it'd be okay

Ahh yes that's a good point actually. I'm not sure, I think it depends what mood the examiners are in when writing the mark scheme for the answers to these suggest questions if I'm honest.

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Reply 2533

NilaJ

Original post by Follett

Anyone know why peritoneal has to be done 4 times a day and haemodilaysis 3 a week?

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Well the fluid reaches equilibrium with the body as there is no counter current system, so I think its because not all of the toxic chemicals are removed, in haemo they are all filtered out but in peri it has to be done repeatedly as concentrations decrease steadily. Its basically far less efficient and they lied, its being phased out as they think it might be dangerous!

Reply 2534

Nellie97

Original post by bmunro

So what did people put for k on the graph question? (I thought that was disgusting) I put the mean number of all the patients but doubt that was right

i put standard deviation but don't think what i put was right :frown:

some of my friends said range???? horrible question though

Reply 2535

raach.14

Original post by hamza3256

What cells make red blood cell and the location.

I wrote kupffer cells; location: liver

I wrote this as well. Most people in my class wrote hepatocytes and the liver but apparently it's stem cells and bone marrow, which makes sense!

Reply 2536

kewla1

Anyone know why peritoneal has to be done 4 times a day and haemodilaysis 3 a week?

I said how peritoneal fluid thing has to be taken out after 4-6 hours? is this right

Reply 2537

Jesspecially4u

Original post by NilaJ

Thats not even in F214, and I don't think that its in AS in a big way either, thats just a biology thing, how were we supposed to know it would come up! Luckily I knew about the bone marrow from other reading but still it was really unfair even if it was only 1 mark.

Yeah, I keep telling myself it was only one mark. :tongue:

I can't believe how little there was of the actual F214 content though. I was all prepared to be writing 6 markers on the loop of Henle and photophosphorylation! :s-smilie: