Photosynthesis: The Calvin Cycle Flashcards
does the LIR require light directly?
no - occurs whether or not light is available
why can the LIR not occur if light is absent for the LDR?
as it requires the products from the LDR
what 2 products are required from the LDR?
- ATP
2. reduced NADP
where does the LIR take place?
in the stroma of the chloroplast molecule
what is the LIR often referred to as?
the Calvin Cycle
how does carbon dioxide from the atmosphere, enter the leaf?
diffuses via the stomata and dissolves in water around the walls of the mesophyll cells, then diffuses into the stroma of the chloroplast
what does carbon dioxide react with?
ribulose bisphosphate, RuBP (5-C molecule)
what is the enzyme that catalyses the reaction between carbon dioxide and RuBP called?
rubisco
what does the reaction between carbon dioxide and RuBP produce?
2x glycerate 3-phosphate, 2x G3P (3-C molecule)
what is reduced NADP from the LDR and energy supplied by ATP, used for?
to reduce 2x G3P into 2x triose phosphate, 2x TP (3-C molecule)
what happens to the NADP when it is re-formed?
goes back to the LDR to be reduced again, by accepting more protons (H⁺)
what happens to some (1/6) of the TP?
converts to organic substances that the plant requires, such as glucose (6-C molecule)
what happens to most (5/6) of the TP, using ATP from the LDR?
regenerated into RuBP (5-C molecule)
