AQA BIOL5 ~ 17th June 2013 ~ A2 Biology

any1 explain neuromuscular junction in muscle thanks

I've been told by lots of people that 4 topics in depth is enough an essay... any thoughts?

I'd love an essay on, ATP, water, or enzymes :P

Correct

is uses of water likely?

1. action potential arrives at synaptic knob
2. calcium ions diffuse in
3. vesicles fuse with pre synaptic membrane
4. release neurotransmitters
5. neurotransmitters fuse across synaptic cleft
6. neurotransmitters bind with receptors on post-synaptic membrane
7. triggers an action potential in post-synaptic membrane with calcium ions again

remember is it is a cholinergic synapse, the neurotransmitter is called ACh, and is broken down by AChE and reabsorbed

sorry if i made any mistakes

what are some ideas for the uses of water in an essay?

Im thinking;
water as electron donor in photolysis in electron transport chain of photosynthesis
water needed in sweat for thermoregulation
in plants to keeps cells turgid
dilution of urea
there are things about water potential and osmosis;
movement of water into plant roots
cholera and loss of water
blood glucose and water potential

hmmm not much

Question 5- b, jUNE 2011 .... If there is already one recognition site on the plasmid, and only 3 fragments are produced, doesn't it mean that there is only one recognition site on the unknown piece of DNA?
Thanks

http://filestore.aqa.org.uk/subjects/AQA-BIOL5-W-QP-JUN11.PDF

apparently we need to cover three of the four units, and have around 3 or 4 topics

and 2 beyond the spec stuff

any1 explain neuromuscular junction in muscle thanks
thx

done the ATP and inorganic ions essay plans - is there any others i should reaaaaaally be doing?

Is it worth the effort of relearning the lungs, Bcells and Tcells