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calvin cycle steps
fixation of atmospheric carbon diocide by ribulose 1,5-bisphosphate to form two molecules of 3-phosphoglycerate
reduction of 3-phosphoglycerate to form glyceraldehyde 3 phosphate which can be converted to hexoses
regeneration of ribulose 1,5-bisphosphate from 2G3P so that more CO2 can be fixed
negatives of rubisco
poorly selective - sometimes bind to oxygen to create waste product
very slow
function of rubisco in calvin cycle
catalyses combination of ribulose 1,5-bisphosphate with CO2
where is rubisco found
stromal surface of thylakoid membrane
most abundant protein in plants
rubisco
reduction steps
3-phosphoglycerate is an intermediate in glycolysis and gluconeogenesis
phosphorylated to 1,3-bisphosphoglycerate with consumption of ATP
then reduced to glyceraldehyde 3-phosphate with oxidation of NADPH
what reduces 1,3-bisophosphoglcyerate to glyceraldehyde-3-phosphate?
oxidation of NADPH
regeneration steps
3 molecules of ribulose-1,5-bisphosphate needed to be regenerated for calvin cycle to continue
5 of the 6 glyceraldehyde-3-phosphate molecules are used to regenerate 3 molecules of ribulose-1,5-bisphosphate
how many times for cycle to go around to produce glucose
production of glucose requires cycle to occur 6 times
what do plants convert glucose/fructose into and where
sucrose in cytosol
starch in chloroplast
cellulose in cell wall
how many molecules of atp and nadph are consumed for each co2
3 molecules of ATP
2 NADPH
photorespiration
when co2 levels are low
oxygen added to ribulose-1,5-bisphosphate
where does most of the glyceraldehyde 3-phosphate get transported to
out of the chloroplast
through antiport system