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ameliestia
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#4141
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#4141
(Original post by Anaiza)
what are the differences between a cholinergic synapse and a neuromuscular junction
cholinergic synapses are just a specific example of a synapse, to instead of a general neurotransmitter, its a neurotransmitter called ACh.

also they have cleft in the post synaptic membrane which contain AChE to break down ACh so it can be reabsorbed by the presynaptic membrane
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pinkfairyarmadillo
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#4142
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#4142
(Original post by Anaiza)
what are the differences between a cholinergic synapse and a neuromuscular junction
A cholinergic synapse uses acetylcholine as its neurotransmitter, so does a neuromuscular junction so a neuromuscular junction is a form of cholinergic synapse.
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rommy123
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#4143
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#4143
so glad this exam is in the afternoon, gives me time to go through my notes and past papers in the morning
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HeraXD
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#4144
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#4144
has anyone seen an essay plan around for 'importance of shapes fitting together' from june 12 and the 'dna in science and technology' it'd be really helpful!! thanks
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master y
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#4145
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#4145
(Original post by ahmmm)
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.
it's an afternoon exam thoughgt!
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Tikara
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#4146
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#4146
(Original post by kingster123)
hey do you know the release of calcium ion causes muscle contraction is it cause it binds with troponin ,which gets realesed from the myosin head so that actin can bind and contract
calcium binds to troponin, causing tropomyosin to move and expose the myosin head binding sites

edit: looking above - yeah I forgot to mention Ca2+ activates myosin atpase also
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Jake1313
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#4147
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#4147
(Original post by Nati36)
I thought that any bacteria that took the marker gene with the plasmid would be blue?
Well, any bacteria that take up the normal plasmid will be blue. But you are looking for the bacteria which have taken up the recombinant plasmid( the plasmid which has the new gene attached e.g. The insulin gene) which will not be blue.
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JacobG
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#4148
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#4148
anyone have a nice document with lots of plans for essays summarised ?
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F1's Finest
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#4149
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#4149
The Unit 5 content ain't the problem, it's the questions before the essay that want you to remember stuff in unit 1,2 and 4 that annoys me (even though I am well guarded on the essay side of things)!
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imawasteman
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#4150
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#4150
should i start revising now i havent done any yet
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mbisababe
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#4151
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#4151
(Original post by Anjna)
what is the definition of refractory period ??
arp - absolute refractory period....
ABSOLUTELY NO WAY CAN AN ACTION POTENTIAL HAPPEN! Cause theres one already happening

rrp - relative refractory period
youre gonna need a preeeeeety big stimulus for another action potential to happen!

proper definition tho...its basically the time after an action potential has occurred (after excitation). At first it is completely inexcitable (arp) and then less excitable (rrp)
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Tikara
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#4152
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#4152
(Original post by Anjna)
what is the definition of refractory period ??
the period when Na+ channels are closed, so the axon membrane cannot be depolarised and an action potential behind the last one is not achieved.
I think it's about 0.2 ms long
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imawasteman
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#4153
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#4153
and what are they gonna make us write about in the essay wat do i need to revise
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safis
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#4154
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#4154
What topics could you use for ATP in regards to dreaded essay?
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mbisababe
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#4155
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#4155
I'm thinking the essay may be on ATP...an essay on that topic hasnt come up yet and it seems the most logical thing to have a question on next...any other ideas?
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ameliestia
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#4156
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#4156
(Original post by imawasteman)
and what are they gonna make us write about in the essay wat do i need to revise
pretty sure we're all gunning for atp here
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Anjna
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#4157
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#4157
what is the function/role of corpus luteum ?
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LitGeek94
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#4158
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#4158
(Original post by Jake1313)
Changes shape of troponin, this moves the tropomyosin filament, exposing the myosin head binding side. Allowing the myosin head to bind.
Remember that calcium ions also activate ATPase, this hydrolyses ATP which is used for returning the myosin head to its original position.
I thought the ATP is used to provide energy for the actin to return to original position after being pulled along by myosin?
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kingster123
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#4159
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#4159
(Original post by Jake1313)
Changes shape of troponin, this moves the tropomyosin filament, exposing the myosin head binding side. Allowing the myosin head to bind.
Remember that calcium ions also activate ATPase, this hydrolyses ATP which is used for returning the myosin head to its original position.
hey can you also explain the how resting potential is obtained and then an action potentiol .. i know it but cant word properly
thank s
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mbisababe
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#4160
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#4160
(Original post by safis)
What topics could you use for ATP in regards to dreaded essay?
P(l)ASMA...

p - processes (monosaccardies->disaccardies, amino acids->polypeptides etc)
a - active transport (atp changing the shape of the carrier protein)
s - secretion (atp used to make lysosomes that get rid of waste)
m - movement (muscles)
a - activation of molecules (ie reducing activation energy)

also you have other things such as respiration and photosyntheis
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