Calvin cycle?

Question

its 2 am...im frustrated i need to describe the calvin cycle in photosynthesis, please help!! just give me a brief simple description....thanks

Answer 1

During photosynthesis, light energy is used to generate chemical free energy, stored in ATP and NADPH. The light-independent Calvin cycle, also (misleadingly) known as the "dark reaction" or "dark stage", uses the energy from short-lived electronically-excited carriers to convert carbon dioxide and water into organic compounds that can be used by the organism (and by animals which feed on it). This set of reactions is also called carbon fixation. The key enzyme of the cycle is called RuBisCO. In the following equations, the chemical species (phosphates and carboxylic acids) exist in equilibria among their various ionized states as governed by the pH.

The enzymes in the Calvin cycle are functionally equivalent to many enzymes used in other metabolic pathways such as glycolysis and gluconeogenesis, but they are to be found in the chlorophlast stroma instead of the cell cytoplasm, separating the reactions. They are activated in the light (which is why the name "dark reaction" is misleading), and also by products of the light-dependent reaction. These regulatory functions prevent the Calvin cycle from operating in reverse to respiration, which would create a continuous cycle of carbon dioxide being reduced to carbohydrates, and carbohydrates being respired to carbon dioxide. Energy (in the form of ATP) would be wasted in carrying out these reactions that have no net productivity.

The sum of reactions in the Calvin cycle is the following:

6 CO2 + 12 NADPH + 12 H+ + 18 ATP → C6H12O6 + 6 H2O + 12 NADP+ + 18 ADP + 18 Pi

Answer 2

in this calvin cycle the main component involved is carbondioxide
1 mol of carbondioxide is accepted by 5-carbon mol ribulose -1 5 bis phospate . then it forms phospo glyceric acid
here the atp& nadph2 are used then the convert into 3 phospoglyceraidehyde ontin
and the cycle conyinues