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  • terminology - What is the difference between Bisphosphate and . . .
    I have often found bisphosphate compounds ( e g RuBP, RuBisCO, 2,3-BPGA etc ) and diphosphate compounds (e g ADP, GDP etc ) in biochemistry They are commonly seen and are important compounds in both animals and plants but what is the basic difference between a bisphosphate and a diphosphate?
  • Calvin cycle:synthesis of glucose - Biology Stack Exchange
    One molecule of carbon dioxide combines with ribulose bisphosphate (RuBP) to form a stable product of two molecules of phosphoglycerate (PGA) This is called carboxylation Then 2 molecules of PGA undergoes reduction to form 2 molecules of phosphoglyceraldehyde (PGAL)
  • metabolism - Why is fructolysis independent of glycolysis? - Biology . . .
    Fructose 1-phosphate lacks some regulatory role of fructose 6-phosphate (or fructose-1,6-bisphosphate) and hence results in different flux of fructose and glucose through glycolysis This is the converse of the previous possibility
  • Reason for conversion of glucose to fructose in glycolysis
    Note that the main carbon fixation pathway in photoautotrophs does indeed use this process: carbon fixation by RuBisCO generates 3-phosphoglycerate and the subsequent action of triosephosphate isomerase and aldolase generates fructose 1,6-bisphosphate
  • Why the C6 intermediate molecule in the Calvin cycle is so unstable
    The question of the existence of 2-carboxy-3-keto-D-arabinitol 1,5-bisphosphate and its role as an intermediate in the RuBisCO reaction was solved in 1986 and is no longer the subject of speculation Its synthesis was described in a paper in Phil Trans R Soc Lond B, which is behind a pay wall, but can be found in a post on ResearchGate
  • biochemistry - Which statement is incorrect for Rubisco? - Biology . . .
    Fixation of O 2 during photosynthesis oxidizes ribulose‐1,5‐bisphosphate into 3‐phosphoglycerate and phosphoglycolate - which is basically a waste of energy D Is incorrect and hence the answer to your question: Rubsico is present in CAM plants E Because of the photorespiration described under B C, Rubisco is indeed regarded to be
  • biochemistry - How exactly is glyceraldehyde 3-Phosphate reverted to . . .
    Around 6 molecules of G3P is produced at the end of the Calvin Cycle (light independent reactions of photosynthesis), and 5 of which are reverted back to RuBp
  • metabolism - Why are 6 turns of the Calvin cycle needed to make one . . .
    1 ribulose 1,5-bisphosphate + 1 CO 2 → 2 3-phosphoglycerate The problem with the epithet cycle in this case is that it differs from the tricarboxylic and urea cycles where a single molecule enters the cycle and is converted to a molecule(s) leaving the cycle in a single series of reactions regenerating the molecule with which the input
  • Does protein kinase A accelerate glycolysis or slow it down?
    The F-2,6-BPase domain is then activated which lowers fructose 2,6-bisphosphate (F-2,6-BP) levels Because F-2,6-BP normally stimulates phosphofructokinase-1(PFK1), the decrease in its concentration leads to the inhibition of glycolysis and the stimulation of gluconeogenesis [8]
  • Glycolysis step 5: isomerization by triose phosphate isomerase
    Step 4 in glycolysis cleaves fructose 1,6-bisphosphate into two molecules that are isomers One isomer (glyceraldehyde 3-phosphate, GADP) is a reactant in step 6, and fuels the “payout phase” where glycolysis reactions begin to yeild ATP and NADH So what happens to dihydroxyacetone phosphate (DHAP), the other product from step 4?





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