AQA A2 Biology BIOL5 - 17th June 2015

Yes maybe but I would struggle to put much unit 5 into that.
I'd go with endotherms and ectotherms, rod and cone cells maybe because some species can only see in black and white light?
Hmm, any ideas?

Can someone explain to me where you would find actin and myosin in these: dark band, light band, hone and z line?

I'm getting really confused with action potentials and summations and the All-or-nothing principle, can anyone help?

And do you think there's much point learning about things in unit 1 such as pressure changes in cardiac Cycle for the essay? Because I don't see how an essay title could allow you to write about it!

Hi, does anyone know why the answer to question 5b in the June 2011 paper is 2? How would you know that both restriction sites are in the DNA fragment and not else where in the plasmid? Thanks

Hi, does anyone know why the answer to question 5b in the June 2011 paper is 2? How would you know that both restriction sites are in the DNA fragment and not else where in the plasmid? Thanks

Just doing that now too, was about to ask the same thing, did you do the first question? Again it says cut once but two fragments? Always 1 less than I think?

Yes- it's used in paternity testing as 50% of DNA is from Mother and 50% from Father, so you can compare the base sequences- hence it's also used in breeding of animals. Then also used in forensics to identify a criminal

Hi ive just done this paper! they key is they are using another plasmid not the same one. we also get told there's 3 pieces but there's only one binding site shown on the known plasmid. To get 3 pieces the plasmid needs to be cut 3 times,so we therefore know that there is 2 in the unknown DNA. it took me a while to work out but i hope this helps and makes sense !

Just doing that now too, was about to ask the same thing, did you do the first question? Again it says cut once but two fragments? Always 1 less than I think?

So there are 3 cuts, but you don't include one as they already know about that one/not in the DNA they are trying to sequence? Thanks

My teacher is really high up in aqa and she said that what happened in psychology with some doing the reserve and some not is never happened before so hopefully if it happens tomorrow they'll just lower the grade boundaries overall so it's easier for us

Hi ive just done this paper! they key is they are using another plasmid not the same one. we also get told there's 3 pieces but there's only one binding site shown on the known plasmid. To get 3 pieces the plasmid needs to be cut 3 times,so we therefore know that there is 2 in the unknown DNA. it took me a while to work out but i hope this helps and makes sense !