A2 Biology OCR June 2015 Revision Thread

At least you didn't answer the behavior question with just learned and innate and not the specific behaviors..

but i swear it said like different types of nuclear divisions HELP PLEASE

Did no one put meiosis 1 and meiosis 2 for the first question?? Because I'm such in the description above the question it said it was happening in the testes so it completely threw me!

It was insight learning and not operant conditioning, OC is learning by reward and punishment whereas insight learning is using reasoning and judgement from past experiences

nicotine makes platelets in blood sticky hence increases blood clots forming. If such event occurs in an artery supplying blood to the brain, there is reduced blood flow to the brain, they don't have sufficient oxygen to respire hence brain cells die

I think it may have just been mitosis and meiosis. The first part of the graph only divided in half, but the second section divided in half and then half again ie. the two stages of meiosis to make the haploid cells.
i'm not 100% just a suggestion, as that's what I put although it's probably wrong.

It was insight learning and not operant conditioning, OC is learning by reward and punishment whereas insight learning is using reasoning and judgement from past experiences

yeah thats is literally exactly what i wrote but was unsure about the increased hypertension? what did you write?

I said mitosis and meiosis. Cause if you looked on the numbers up the side of the graph. On the first one, it started at 2n(the diploid amount) doubled to 4 and went back to 2 (mitosis) where the second one doubled to 4, dropped down to 2 and halfed again producing a haploid amount of chromosomes. (Meiosis)

For high blood pressure i said haemorrage

Dunno how to spell it

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For high blood pressure I said that the artery endothelium could get either damaged - leading to atherosclerosis - or it could rupture meaning that the blood wouldn't be able to reach the brain... do you think that is right or not?

Yeah I put the same hahaha I agree. I think they tried to through people off by saying it as in the testes so people would have automatically put meiosis 1&2

Lmao did it say it was in the testes???? Shows how much I read the questions haha!!!

Lmao did it say it was in the testes???? Shows how much I read the questions haha!!!

For high blood pressure I said that the artery endothelium could get either damaged - leading to atherosclerosis - or it could rupture meaning that the blood wouldn't be able to reach the brain... do you think that is right or not?

What do you guys think the A grade boundary will be?

I talk about receptors and proteins being damagaed loooooool AS IFFFFF please tell my why im so stupid
what do you think c will be out of 100 please