Question

Which of the following does not occur during the calvin cycle? a) oxidation of NADPH b)...

Which of the following does not occur during the calvin cycle?

a) oxidation of NADPH

b) release of oxygen

c) regeneration of the CO2 acceptor

d) carbon fixation

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Answer #1

The correct answer would be (b). Release of Oxygen doesn't occur during Calvin Cycle.

It happens during the Light Reaction Stage of Photosynthesis. An electron is stripped from a water molecule freeing the oxygen and hydrogen atoms. The free oxygen atom then combines with another free oxygen atom to produce oxygen gas which is then released.

Rest three options occur in Calvin Cycle as explained below:

  • Carbon fixation - Carbon dioxide (CO2) is reacted to produce glyceraldehyde 3-phosphate (G3P). The enzyme RuBisCO catalyzes the carboxylation of a 5-carbon compound to make a 6-carbon compound that splits in half to form two 3-phosphoglycerate (3-PGA) molecules. The enzyme phosphoglycerate kinase catalyzes phosphorylation of 3-PGA to form 1,3-biphosphoglycerate (1,3BPGA).
  • Reduction reaction6 CO2 6 ribulose bisphosphate (RuBP) 12 phosphoglycerate (PGA) eo00000 0000 6 ADP Calvin GATP 12 ATP Cycle 6 ribulose phospha - The enzyme glyceraldehyde 3-phosphate dehydrogenase catalyzes reduction of 1,3BPGA by NADPH.
  • Ribulose 1,5-bisphosphate (RuBP) regeneration - At the end of the regeneration, the net gain of the set of reactions is one G3P molecule per 3 carbon dioxide molecules.
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