Carbon Fixation Flashcards
Why is there such a high pH gradient in chloroplasts?
The thylakoid membrane is leaky to charge
What is the approx. number of H+ translocated for every O2 formed?
8-12
Why does the membrane potential n chloroplasts not build up?
Because of compensating Cl- co-translocation and counter translocation of Mg2+
Which side of the thylakoid membrane is CFI?
Stromal side
What is the role of CFI part of ATP synthase?
Catalyses synthesis of ATP
What is the role of the CFO ATP synthase subunit?
H+ translocation
Where is the CFO ATP synthase subunit located?
The thylakoid membrane
Why is photosynthesis such a good energy giving system?
The ADP/ATP ratio is so far from eqm
Where do the dark reactions occur?
In the stroma of chloroplasts
What proportion of glyceraldehyde-3-phosphate is cycled back to produce more RuBP
What are the roles of ATP in the Calvin cycle?
As a phosphate donor and as an energy donor
What is the role of RuBisCo under high CO2 conditions?
To catalyse the carboxylation of RuBP into 2 molecules of glycerate-3-phosphate
Where is RuBisCo located?
On the stromal surface of thylakoid membrane
What happens to RuBisCo at low [CO2] and high [O2]?
RuBisCo exhbits oxygenase acitivty, using O2 rather than CO2
