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13 Terms

1
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calvin cycle steps

  1. fixation of atmospheric carbon diocide by ribulose 1,5-bisphosphate to form two molecules of 3-phosphoglycerate

  2. reduction of 3-phosphoglycerate to form glyceraldehyde 3 phosphate which can be converted to hexoses

  3. regeneration of ribulose 1,5-bisphosphate from 2G3P so that more CO2 can be fixed

2
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negatives of rubisco

  • poorly selective - sometimes bind to oxygen to create waste product

  • very slow

3
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function of rubisco in calvin cycle

  • catalyses combination of ribulose 1,5-bisphosphate with CO2

4
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where is rubisco found

  • stromal surface of thylakoid membrane

5
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most abundant protein in plants

rubisco

6
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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

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what reduces 1,3-bisophosphoglcyerate to glyceraldehyde-3-phosphate?

  • oxidation of NADPH

8
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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

9
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how many times for cycle to go around to produce glucose

  • production of glucose requires cycle to occur 6 times

10
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what do plants convert glucose/fructose into and where

  • sucrose in cytosol

  • starch in chloroplast

  • cellulose in cell wall

11
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how many molecules of atp and nadph are consumed for each co2

  • 3 molecules of ATP

  • 2 NADPH

12
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photorespiration

  • when co2 levels are low

  • oxygen added to ribulose-1,5-bisphosphate

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where does most of the glyceraldehyde 3-phosphate get transported to

  • out of the chloroplast

  • through antiport system