well yeah you are correct but you gave me an EXAMPLE of negative feedback, i need its definition.....(Original post by ConnorB)
a process of homoeostasis such as Vasolidation or Sweating which maintains constant internal temperature from small deviations in the external environment?
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Edexcel A2 Biology Unit 5 (6BIO5) - 22/06/2011- OFFICIAL THREAD ! watch
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- 21-06-2012 20:13
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- 21-06-2012 20:13
(Original post by iesians)
yup we do !
someone on this page posted a 100% correct answer chk it out !
Does anyone else think that Transcription factors will come up in the pre-release? -
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- 21-06-2012 20:13
Has anyone got notes on GM's ? only topic I know **** about
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PlatypusPigeon
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- 21-06-2012 20:16
(Original post by ConnorB)
Well it's not too much extra to learn :P
Does anyone else think that Transcription factors will come up in the pre-release? -
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- 21-06-2012 20:18
(Original post by ConnorB)
Well it's not too much extra to learn :P
Does anyone else think that Transcription factors will come up in the pre-release?
Care to explain what Transcription factors are etcc. -
sunshinesmile10
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- 21-06-2012 20:18
(Original post by iesians)
well yeah you are correct but you gave me an EXAMPLE of negative feedback, i need its definition.....
Homeostatic systems involve receptors, a communication system and effectors. The receptors detect the change in level and the effectors counteract the change. Negative feedback only works within limits i.e when the change is small ...
hope this helps -
sunshinesmile10
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- 21-06-2012 20:21
(Original post by ZTSR)
Yes yes yes. I think it will previously has in one of the old article questions.
Care to explain what Transcription factors are etcc.
An example given in the CGP guide is the thyroid hormone recpetor. Ideally, it slows down the transcription of a protein that controls metabolism. Howver, when thyroxine binds to it, it speeds up the rate, acting as an activator. More protein is produced and increase body temperatur
EDIT: just saw you didnt actually want to know. Sorry, but its out there nowLast edited by sunshinesmile10; 21-06-2012 at 20:23. -
avataraang
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- 21-06-2012 20:23
Hey guys!
So I have been revising a lot, did lots of past papers, did go through all the spec. points but the one thing always holding me back in biology is the HSW.
I just can't seem to know what the mark scheme wants, especially if you have to apply your knowledge to an unfamiliar scenario (which always comes up!)
Can someone please give me advice on how to overcome this tomorrow? I will give rep points to those who give good advice, as I really need an A/A* in tomorrows paper.
Good luck! -
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- 21-06-2012 20:26
(Original post by PlatypusPigeon)
Outline role of transcription factors which lead to higher expression of PRDM16 in BAT than WAT, i'm sensing that...
certain transcription factors present in BAT initiate the transcription of a gene which codes for the production of PRDM16 by binding to the promoter region in the DNA. the transcribed mRNA is then translated into a functional PRDM16 protein. WAT does not have those transcription factors which are needed for the production of PRDM16 protein. -
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- 21-06-2012 20:28
PRDM16 is a protien right ? but article says it is KNOCKED OUT ?! only a gene can be knocked out ? i dont get it ! and is there a hormone or somethign which initiates the production of PRDM16 ..?
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PlatypusPigeon
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- 21-06-2012 20:28
(Original post by avataraang)
Hey guys!
So I have been revising a lot, did lots of past papers, did go through all the spec. points but the one thing always holding me back in biology is the HSW.
I just can't seem to know what the mark scheme wants, especially if you have to apply your knowledge to an unfamiliar scenario (which always comes up!)
Can someone please give me advice on how to overcome this tomorrow? I will give rep points to those who give good advice, as I really need an A/A* in tomorrows paper.
Good luck!
Sorry there's no magical answer to it, it's just applying your knowledge and in most cases revising a markscheme which is stupid if you ask me but that's Snab for you! -
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- 21-06-2012 20:30
where have you been...............
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- 21-06-2012 20:30
Can someone explain q2a in june 11 and why the shoot goes right and not left to the light.
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PlatypusPigeon
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- 21-06-2012 20:32
hmmm would this be a good answer to it :-
certain transcription factors present in BAT initiate the transcription of a gene which codes for the production of PRDM16 by binding to the promoter region in the DNA. the transcribed mRNA is then translated into a functional PRDM16 protein. WAT does not have those transcription factors which are needed for the production of PRDM16 protein. -
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- 21-06-2012 20:33
gonna sound like a very stupid question lol but is ETC process and oxidative phosphorylation the same thing?
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PlatypusPigeon
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- 21-06-2012 20:36
(Original post by user3456)
gonna sound like a very stupid question lol but is ETC process and oxidative phosphorylation the same thing? -
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- 21-06-2012 20:36
(Original post by user3456)
gonna sound like a very stupid question lol but is ETC process and oxidative phosphorylation the same thing?
IT INVOLVES ETC and chemiosmosis. -
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- 21-06-2012 20:38
(Original post by PlatypusPigeon)
ETC and chemiosmosis make up oxidative phosphorylation, may be best not the label them as the same! Without ETC you wouldn't have the energy to move protons down the gradient and form ATP from ATPase :P -
pandoraclaire
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- 21-06-2012 20:39
(Original post by rohitbd)
Can someone explain q2a in june 11 and why the shoot goes right and not left to the light. -
PlatypusPigeon
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- 21-06-2012 20:40
(Original post by iesians)
i dont get that bit !! why is ENERGY needed to move something DOWN its gradient, isnt it only needed to move somethign AGAINST its gradient ..?hmmmmmmmmmmmm
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