Question

Rate My Answer Please Out of 10. (10 Being the best)


b) Describe two structural features of the chloroplast that allow it to perform its functions and do them efficiently. [4 C]

The First Feature will be the PS2 and PS1 which allow the Light reactions to take place. In the Light Reactions H2O molecules are broken down into Hydrogen, Oxygen and 2 Electrons. At first, electrons jump to an excited state and then back down until they reach the Final electron acceptor, in this case it would be FeoPhitin. The electrons are then transported throughout the Thylakoid..

Answer 1

through different Electron Carriers *Pq, Pc* and end up into the PS1 where they replace those electrons. The electrons that were given up in PS1 make there way to Ferrodoxin and then to NADH Reductase where NADH reduces to NADHP and then makes its way onto the Calvin Cycle. Meanwhile When Electrons are being pumped through the various electron transport Chains (Bf-6 phosphate), Pq, Pc, Protons are being pumped into the Thylakoid Lumen. These H protons will be used in the Phosphorylation of ATP with the use of the ATP synthase (ADP + Pi = ATP).
The Second Feature will be the Calvin Cycle. In this Cycle CO2 molecules with be "Fixed" onto RuBP (a 5 carbon molecule) to make a unstable 6 carbon molecule. This unstable 6 carbon molecule will break off into 2 '3 carbon Molecules' Which are PEP. Then with the help of ATP breaking into ADP giving off its Phosphate group and the oxidation of NADPH (its helping by giving its energy), G3P will be made. When G3P is made it will be transferred out of the Calvin Cycle and off to make either Glucose, Sucrose, or Other essential Nutrients. Most of the G3P will actually be put back into the Calvin Cycle for the Reproduction of RuBP. This reaction uses various reactions which include the use of H2O and ATP.

Answer 2

pheophytin*, photosynthesis doesn't use NAD+ it uses NADP+

Answer 3

but overall it's good

Answer 4

Oh that was my mistake, I meant NADPH since it obviously is used in the Calvin Cycle...And thanks. I think that would get a perfect other than that small mistake

Answer 5

also you mentioned PEP, is it caboxylase? because that's used in C4 plants not C3

Answer 6

Another mistake...bah meant PGA ... Thanks for spotting that

Answer 7

haha no prob, you should re-read your answers always

Answer 8

Thanks for your help :)

Answer 9

no prob! you could also talk about the wavelength at which each photosystem most efficiently works P1=P680 , P2=P700

Answer 10

Teacher said don't worry about wave lengths x D Also come to think of it, I could have talked about Cyclic electron flow :P

I also am Having a Bit of Trouble with understanding C4 and CAM plants since I missed that Class, Ill Open another question up and ask it there if you dont mind explaining it briefly?

Answer 11

haha yep! and which photosystem is involved in the cyclic flow of electrons?

sure dude post away

Answer 12

PS1 is the only Photosystem involved in cyclic flow of eletrons ;)