AQA BIOL5 ~ 17th June 2013 ~ A2 Biology

oh my i just remembered that i actually have a mock for this bio 5 exam tomorrow

Good luck

Has anyone done any practice for the essay?

thanks i just hope there is hardly anything on dna especially not the essay questions

me

No, unfortunately not. It is the only thing I'm concerned about, and I need to finish the final topic (16). I do not know how I'm supposed to tackle this essay, if anyone does, I would love a cheeky pm or a quote. We're still doing topic 14 as a class so it won't be a while yet till I get to do anything substantial in terms of the essay. That being said, I've managed to salvage a booklet which sort of identifies synoptic topics and gives a rough idea of how to approach the essay.

Have you?

We've just been given one as homework - about using DNA in science and technology. I'll have a go at it tomorrow :/

I think an essay's quite a subjective way of marking biology...I could take my essay in completely the opposite direction to what they're looking for. I'd rather just have more questions

When I was in class today we were going through some sample essays,
anybody like to discuss this particular one?

Negative feedback in organisms - (from a legacy paper actually)
so far with regards to A2 topics
1/ regulation of blood glucose
2/ temperature (thermoregulation)
3/ control of heart rate
4/ blood pressure (part of heart rate)

What else do you guys reckon, (AS related probably?)

Yes, as far as I am aware you are correct

Ok. If I remember correctly (I better be correct! ), the impluse(s) during a reflex arc, avoids the CNS because it would slow down the rate at which the reflex occurs. The brain is generally only told about the reflex/stimulus after it has occurred. This is a survival adaptation; it avoids the brain being overloaded with information and means that we avoid harmful stimuli much more quickly as the neurone pathway is shortned. For example, you put your hand on a burning stove, there is no need for your brain to process "should I take my hand off, or should I not?", you just automatically do it to survive. AFTER your hand has been removed (the effector has completed it's role), your brain is informed and you realise what has happened. (Take a look at page 146, "importance of relfex arc" in the AQA textbook)

Just because an impulse goes to the brain, it doesn't mean you can render the resultant action or effect as being under concious control.... Look at it like this, you do not actively choose whether your heart rate increases or decreases once the sinoatrial nodes and respective centres of the medulla oblongata are stiumlated. Their effect is involuntary... (Go over page 147 "control of heart rate in the AQA textbook)

A coordinator, does just that - coordinates. At its simplest it aligns the information from a stimulus and (decides upon) the actions of an effector. I look at a coordinator as a sort of sorting station, it translates the information from a receptor and makes it readable for an effector, using the nervous system to transfer this information in the form of impulses.

I really should be asleep right now; apologises for any mistakes or spelling errors I have made. I hope this has helped, if anything just quote me.

OMG ive just been using the nt book!! and i NEED an A in biol 4 and 5 this june!!

I don't have the gcp should i buy it?

When I was in class today we were going through some sample essays,
anybody like to discuss this particular one?

Negative feedback in organisms - (from a legacy paper actually)
so far with regards to A2 topics
1/ regulation of blood glucose
2/ temperature (thermoregulation)
3/ control of heart rate
4/ blood pressure (part of heart rate)

What else do you guys reckon, (AS related probably?)

Is there anything that's AS related that you could write?

When I was in class today we were going through some sample essays,
anybody like to discuss this particular one?

Negative feedback in organisms - (from a legacy paper actually)
so far with regards to A2 topics
1/ regulation of blood glucose
2/ temperature (thermoregulation)
3/ control of heart rate
4/ blood pressure (part of heart rate)

What else do you guys reckon, (AS related probably?)

x

When I was in class today we were going through some sample essays,
anybody like to discuss this particular one?

Negative feedback in organisms - (from a legacy paper actually)
so far with regards to A2 topics
1/ regulation of blood glucose
2/ temperature (thermoregulation)
3/ control of heart rate
4/ blood pressure (part of heart rate)

What else do you guys reckon, (AS related probably?)

If you don't get 140 UMS, you better call up AQA!

Hey - you said you got this from a legacy paper. Do you know which ones contain these essay questions/titles?

hey guys

so i did the mock exam and it turns out to be the specimen paper, and i did the essay on the causes of variation and its biological importance

How did you find the paper?