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havana-affair
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#4101
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#4101
Is it worth the effort of relearning the lungs, Bcells and Tcells
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ameliestia
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#4102
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#4102
(Original post by kingster123)
any1 explain neuromuscular junction in muscle thanks
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
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gingerandice
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#4103
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#4103
what time are people sleeping today?
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LitGeek94
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#4104
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#4104
I've been told by lots of people that 4 topics in depth is enough an essay... any thoughts?
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ahmmm
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#4105
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#4105
(Original post by master y)
:afraid:
my sleeping pattern is as ****ed up as tulisa constavovolvolas so ill be getting to sleep around 3 - gotta be up at 6, in college for 8:30 to revise till this exam. ****ed.
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ameliestia
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#4106
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#4106
(Original post by LitGeek94)
I've been told by lots of people that 4 topics in depth is enough an essay... any thoughts?
apparently we need to cover three of the four units, and have around 3 or 4 topics

and 2 beyond the spec stuff
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ahmmm
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#4107
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#4107
(Original post by Tikara)
I'd love an essay on, ATP, water, or enzymes :P
loads of people have said water, is it likely? might revise that too just in case
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ahmmm
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#4108
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#4108
anybody got any off spec stuff for water, inorganic ions or ATP !?
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LitGeek94
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#4109
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#4109
(Original post by stoppy123)
Correct :nod:
THANK YOU for the help!!
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EllieSp
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#4110
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#4110
(Original post by ahmmm)
is uses of water likely? :eek:
maybe... but this is aqa and they like to be unpredictable.
:mad:
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kingster123
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#4111
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#4111
(Original post by ameliestia)
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


oh thanks i was wondering if you had to put sarcolemma and tbubles in your answer
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Nati36
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#4112
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#4112
(Original post by EllieSp)
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
hydrolysis maybe, by-product of many reactions (photosynthesis)
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Jake1313
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#4113
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#4113
(Original post by kdk)
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...W-QP-JUN11.PDF
No there is two, as the DNA is circular.
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LitGeek94
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#4114
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#4114
(Original post by ameliestia)
apparently we need to cover three of the four units, and have around 3 or 4 topics

and 2 beyond the spec stuff
I heard the out the spec stuff only needs to be a paragraph... even then, I can't do it lol
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Tikara
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#4115
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#4115
(Original post by kingster123)
any1 explain neuromuscular junction in muscle thanks
thx
Where a motor neuron meets a muscle fibre. Same principles as synapses but the post synaptic membrane is now a sarcolemma (muscle cell membrane).

Like most synapses acetylcholinesterase breaks down the acetylcholine for reabsorption after stimulating the Na+ channels to open.

And the nerve impulse travels through the membrane to cause the release of Ca2+ from the sarcoplasmic reticulum (causing contraction)
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chloeahern
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#4116
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#4116
(Original post by ahmmm)
done the ATP and inorganic ions essay plans - is there any others i should reaaaaaally be doing?
please please please could you post your plan for the inorganic essay plan as im struggling! other people have also said 'the importance of water' is an essay that is likely to come up
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F1's Finest
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#4117
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#4117
sarcoplasm
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_jamie
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#4118
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#4118
(Original post by havana-affair)
Is it worth the effort of relearning the lungs, Bcells and Tcells
I'd learn a lung disease because it could be useful on an essay title about disease or transfer across membranes.
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Andrewjames6
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#4119
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#4119
anyone else sit bio4 in january and has forgotten the specific details of respiration and photosynthesis?
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starfish232
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#4120
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#4120
could someone please explain the answers to 9d(i) and 9d(ii) for the June 2010 paper. I don't understand why the answers are what they are.

Also, Q1(b), one of the answers is 'Gravity' and I don't understand why that is?

http://filestore.aqa.org.uk/subjects...W-QP-JUN10.PDF
http://filestore.aqa.org.uk/subjects...W-MS-JUN10.PDF
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