AQA A2 BIOL5 22nd June 2012

Anyone got the 2012 jan paper and mark scheme?

Anyone got the 2012 jan paper and mark scheme?

I live in manchestaaaaa...lol And I find it jokes how people on tsr are always comparing the north and south of the country as though they're different countries. people from London sometimes say "up norff" haha. You?

North Yorkshire man myself, never been to Manchester but I find the accent amusing; no offense intended

:O 7 pages!! my teacher told me to write 2 sides, and if really pushed for content then 3 sides

We've been encouraged to spend like 40 minutes. About 4 sides?

You've never been to Manc before? you're a rarity then lol, but the north is pretty much the same all around, apart from the accent.

How's bio 5?

This thread just made me remember how much content there actually is in this unit. It's a hell of a lot! Nelson Thornes seriously needs to review the AQA book, espech the genetics section. As good as it is (helped me get that A in bio alone), it does contains a lot of conflicting information.

Well so far I've seen:

- Inorganic ions
- Energy transfers
- ATP
- Structure and functions of proteins
- Variation

I think those are the most that were talked about so far!

Can someone please explain why partial digestion of DNA fragment leads to DNA fragments adding up to more than the orignal DNA length? I understand you have larger fragments but why do you have more DNA quantity? thanks!

Which parts conflict seen as that book is probrably going to be my only source of bio revision/consolidation?

As far as I understand it, the process involves many different strands of DNA. When they're only partially digested, some strands will have been cut at all the right points and some strands won't have been properly digested yet.

If all of the strands were digested, then they'd all have been cut at the same points and the fragments would all add up to the original length. If partial digestion occurs, some fragments haven't been cut at the right places yet and consequently there are pieces of bigger lengths, so the fragments together add up to more than the original length.

does the action potential involve any active transport???

Yep! The Sodium-Potassium pump actively transports sodium ions out and potassium ions in. 2 potassium ions are pumped for every 3 sodium ions