How are two processes from photorespiration related?

Several physiological processes may be responsible for linking photorespiration and nitrogen assimilation. Photorespiration increases availability of NADH, which is required for the conversion of nitrate to nitrite.

Two molecules are produced: a three-carbon compound, 3-PGA, and a two-carbon compound, phosphoglycolate. ... Photorespiration results in a loss of 3 fixed carbon atoms under these conditions, while the Calvin cycle results in a gain of 6 fixed carbon atoms.

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a- all cells come from pre-existing cells