AQA A2 Biology BIOL5 - 17th June 2015

my favourite question was a 3 marker asking the advantage of people not having the desire to eat when their stomach was full, same as the mouse and dopamine one you were talking about above.

And honestly 2 of the marking points were to prevent obesity and vomiting...
but it will be over in 2 days

Oh wow yeah I forgot about that one! Crazy times. I think I might have missed a mark on it too because I neglected to state the completely obvious, haha.

And that's the only fact that's getting me through. Especially since that will be all my exams finished then.

Not ready for BIOL5 at all.

What do you guys think the synoptic essay will be now that our exam has been rewritten?

it's been re written WHAT?


Posted from TSR Mobile

could someone explain to me why the presynaptic neurone at a synpase has many mitochondria, im not sure what the extra ATP is used for, any help?

could someone explain to me why the presynaptic neurone at a synpase has many mitochondria, im not sure what the extra ATP is used for, any help?

Used to recombine the broken down acetyl and choline from the acetylcholinesterase back into acetycholine

As far as I'm aware it's to do with the extra processes involved with the passage of the action potential across the synapse. The presynatptic neurone needs to be able to perform many condensation reactions on the acetyl coenzyme A and the choline (which I think is what makes the acetyl choline) and this requires energy. Also forming the lysosomes to hold the acetylcholine in requires energy. There's probably also some active transport going on somewhere I would presume of acetyl coenzyme A and choline back into the presynaptic knob once the aceylcholinesterase has hydrolysed them.

Anyone know what year dna technology was asked in the essay?


Posted from TSR Mobile