PHOTOSYNTHESIS

Showing 1 to 20 of 20

Lets go for it .... All the plantt stuff we've done... Light dependant/dependant reactions :)

Posted: 21-12-09 23:42 by Matthew Maguire

Matty is COOL. ....LOL

Right! Light DEpendant!

Takes place in thylakoid membrane (Y)

When a photon of light hits photo system II, the electrons get EXCITED (hahaha) or "move to a higher energy level" - Banisha '09.

The electrons then travel down the Electron Transport Chain, losing energy as they do. This generates....drumroll ATP!!!!

o0o0o and Photolysis takes place to replace the lost electrons! This process gives off O2 as waste, WIN FOR HUMANS!

Well enough from me, somebody else can man up and do it. lol

Posted: 22-12-09 19:09 by Lauren Carry

Erm.... Lovely... Thanks Lauren I'll have Mr Celvin Melvin :D

Ok...

Carbon dioxide binds with ribulose bisphsospate (5 carbon).

This reaction is catalysed by rubisco.

This forms two lots 3-phosphoglycerate, by splitting into 2 smaller molecules it means that these products are more immediate and avaliable for a reaction.

3-phosphoglycerate then undergoes a reduction to make triose phosphate.

This includes the addtion of NADPHred which forms NADPH

It also includes the formation of ATP from ADP+Pi

TP is a 5-carbon molecule, 1-carbon from every cycle contributes to the production of a hexose sugar or other organic substances.

As for the rest of the TP this gets rejuvenated into RuBp.

Posted: 23-12-09 23:22 by Matthew Maguire

This includes the addtion of NADPHred which forms NADPH <------ wunt that jus be NADPH to form NADP because im sure NADPHred isnt like real and its jus NADPH or NADPred

Posted: 23-12-09 23:58 by Robert Austick

... I did that mistake on purpose :P

Posted: 24-12-09 12:11 by Matthew Maguire

sure u did

Posted: 27-12-09 19:30 by Robert Austick

I'll go back to light DEpendent... so starting from where Lauren finished...

Right when the electrons move along the transport chain they lost energy.. this energy is used to transport H+ into urrmm argghhh WHATS IT CALLED!!!!! urrrm THYLAKOID! so that then has a higher conc. of H+ than urm blaah the stroma.. this forms a proton gradient across the membrane..

H+ move down the gradient in the stroma via ATP synthase.. the energy from this movment makes ATP

Right going back to the start... where the electrons move to PS1.. light energy is absorbed by electrons.. making them excited.. la la la...higher energy level and all that stuff.. la la electrons are transfered to NADP along with H+ to form NADPH

and i think thats done now..

1 question for Lauren.. my favourite question :P

Whats ATP and NADPH actually used for in the Calvin cycle? :P

Posted: 02-01-10 21:38 by Banisha Nayyar

banisha you nerd with the question

Posted: 03-01-10 17:21 by Robert Austick

:D go on rob have a crack at it

Posted: 03-01-10 20:38 by Banisha Nayyar

NADP is used to fasilitate the reduction(?) reaction bewteen G3P to TP this is done by suplying the extra protons needed.
ATP is used to supply energy and to proved an extra phosphate to ribulose monophosphate for it to be able to turn back to ribulose bisphosphate i think

im sure ive missed some thing out tho

Posted: 03-01-10 21:22 by Robert Austick

Hmmm.... NADP(red) This is a co-enzme... Erm.. used to take protons from Calvin Melvin to the light dependant reaction to provide the proton gradient and an electochemical gradient to enable ATP sythesase to occur... Chemiosmosis is the process.

Posted: 03-01-10 21:52 by Matthew Maguire

Rob... think you meant NADPH allows G3P to be reduced to TP, and thats why it goes to NADP because thats been oxidised... well done :)

Posted: 04-01-10 17:47 by Banisha Nayyar

same **** lol i jus wanted to see if matty saw the mistake cos he put one in purpose for me aparently so i was returning the favour but he dint get it but you did well done!!!! you won the game!

Posted: 04-01-10 17:51 by Robert Austick

LOL wow you guys are beyond cool :D

Posted: 04-01-10 19:06 by Lauren Carry

Ok.. yes that is right, but the initial principle is to complete the cycle... NAPH is used for photophosphorolation in the light dependant reaction... Otherwise we wont be able to get to Calvin?

Posted: 04-01-10 22:15 by Matthew Maguire

I drew myself a lovely spazzed-down diagram of this yesterday. It's great :D lol.

Posted: 05-01-10 11:05 by Lauren Carry
Posted: 05-01-10 19:17 by Lauren Carry

int ther sum **** also where some electrons or sumat like that go to a higher energy level n then sum stuff happens n nadph is made n then the electrons go to a higher energy level again n atp is made because ov atp synthesaze or sum baba cos i dunno that bit . D: HEEEEELLLLPPPPP IF IM WRONG!!!!!!!!!!!!!!!

Posted: 10-01-10 02:08 by Robert Austick

Lol Keeno Robb! 02.08 A.M !!! :P

Erm... Photophosphorolation.... Water molecules are split to give electrons, Hydrogen ions disassociate from NADP+... The electons will go through a number of electron carriers... This allows Hydrogen ions to travel across a membrane. This is because of the concentration gradient of Hydrogen ions... Higher conc. to lower conc. These hydrogen ions then drive ATP sythesase by releasing energy as they go back down the gradient. This energy is used to bind ADP+Pi= ATP :D ... Now the ATP will go into use in drving the Calvin cycle and so will the NADP which is recycled back into Calvin to make NADP+ again. :D

Hope That made sense Robb! Please correct me if I'm wrong :)

Posted: 11-01-10 22:38 by Matthew Maguire

cheers :) n i was ill n couldnt sleep man so shhhhh

Posted: 13-01-10 09:50 by Robert Austick