Which molecule is regenerated in the regeneration phase of the calvin cycle? Without regeneration of this molecule the calvin cycle would stop.

The molecule that is regenerated in the regeneration phase of the Calvin cycle is ribulose 1,5-bisphosphate (RuBP).

RuBP is the molecule that carbon dioxide is fixed to in the first step of the Calvin cycle. It is also the molecule that is regenerated at the end of the cycle so that it can be used to fix more carbon dioxide.

The regeneration of RuBP is essential for the Calvin cycle to continue. Without it, the cycle would stop after one turn, and the plant would not be able to photosynthesize.

The regeneration of RuBP is accomplished through a series of reactions that use ATP and NADPH from the light-dependent reactions of photosynthesis. These reactions convert the products of the carbon fixation reaction into RuBP.

The regeneration of RuBP is a complex process, but it is essential for the Calvin cycle to function. Without it, plants would not be able to photosynthesize, and life on Earth would not be possible.