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Edexcel A2 Biology Unit 4(6BIO4) 13/06/11 - OFFICIAL THREAD !

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What is carbon fixation? What does it produce? Does it produce GP?

yeah, its basically the Light Independant reactions of photosynthesis or Calvin cycle. RuBP combines with CO2 to form GP and then GP reduced to to GALP by naDPh2 and ATP is all part of carbon fixation!

Reply 441

mrozzi

Original post by imaam

What is carbon fixation? What does it produce? Does it produce GP?

carbon fixation occurs in the calvin cycle, Rubp and CO2 are catalysed by the enzme Rubisco producing 2GP

Reply 442

touran22

some one please go over Brine Shrimp experiment!

Reply 443

Schoolio93

Original post by lily92

CH5? Mines Chemistry by Design.. I see your doing medicine, nice! So I'm guessing you need 3A's?

I need AAAC (chem, math, german, bio) for imperial and A*AA (chem, maths, bio) for cambridge.

Reply 444

Schoolio93

what does selective pressure mean?

Reply 445

PsyChris

Original post by mooniibuggy

Excellent

i woul like to , but isnt that going to impair your performance for tomorrow

Reply 446

darkiee

Original post by imaam

What is carbon fixation? What does it produce? Does it produce GP?

Ribulos Bisphospate is a 5C compound when carvon fixation happens with enzyme using Rubisco and the new 6C people is unstable and break into 2 3C called gylcerate phosphate (GP)

Reply 447

darkiee

Original post by PsyChris

i woul like to , but isnt that going to impair your performance for tomorrow

Psychris its an afternoon paper so it doesnt bother me

(edited 12 years ago)

Reply 448

mooniibuggy

Original post by PsyChris

i woul like to , but isnt that going to impair your performance for tomorrow

True but we can wake up later cos the exam's in the afternoon.

I'm tired all the time anyway so it probably won't affect me lol :tongue:

Reply 449

PsyChris

Original post by mooniibuggy

True but we can wake up later cos the exam's in the afternoon.

I'm tired all the time anyway so it probably won't affect me lol :tongue:

good point, sorry im too scared to try that for the first time ill do it for a **** exam that doent count like general studies

Original post by darkiee

Psychris its an afternoon paper so it doesnt bother me

fair enough, why are u referring to my username in every comment darkiieee??

Reply 450

darkiee

Original post by PsyChris

fair enough, why are u referring to my username in every comment darkiieee??

I address people with thier name ini, Its respect :biggrin:

Reply 451

PsyChris

Original post by darkiee

I address people with thier name ini, Its respect :biggrin:

its just sounds really formel, like im being adressed by my teacher, anyway respect darkiee, gd luck for ur exams

Reply 452

darkiee

Original post by PsyChris

its just sounds really formel, like im being adressed by my teacher, anyway respect darkiee, gd luck for ur exams

LOOL, okay I shall stop, I hope everything goes well tomorow

yes all nighter

Thanks for the answers! Has anyone ever learnt cistrons - it was an answer in the jan 2011 paper which ive never heard of in my life!!

Reply 455

darkiee

Original post by imaam

Thanks for the answers! Has anyone ever learnt cistrons - it was an answer in the jan 2011 paper which ive never heard of in my life!!

My teacher claims its new stuff required to b learnt at AS Level, something to do with DNA

Reply 456

InItToWinItGetIt?

Original post by imaam

Thanks for the answers! Has anyone ever learnt cistrons - it was an answer in the jan 2011 paper which ive never heard of in my life!!

you could have got it by deduction, but yeah never heard of it until the jan 11 paper.

Reply 457

Rothers

Original post by Schoolio93

what does selective pressure mean?

A pressure put on organisms by the environment, either biotic or abiotic factors which lead to the most well adapted organisms to that specific environment to survive most effectively and pass on their alleles, all via the process of natural selection.

Isn't it glorious!? :smile:

Reply 458

HELPME-ology

kinda scared now...

im awake but duno if its best to revise as an all nighter/till im tired
jus in case none of it was worth it?!
but then kinda dnt wanna regret not takin the time to study etc

hmmmm....

unit 5 better be goooood cos this unit has totally ruined me so far! :/